android app快速开发_android app开发工具

(32) 2024-06-20 13:01:01

一、日志工具类 Log.java

public class L

{

private L()

{

/* 不可被实例化 */

throw new UnsupportedOperationException("Cannot be instantiated!");

}

// 是否需要打印bug,可以在application的onCreate函数里面初始化

public static boolean isDebug = true;

private static final String TAG = "DefaultTag";

// 下面四个是默认tag的函数

public static void i(String msg)

{

if (isDebug)

Log.i(TAG, msg);

}

public static void d(String msg)

{

if (isDebug)

Log.d(TAG, msg);

}

public static void e(String msg)

{

if (isDebug)

Log.e(TAG, msg);

}

public static void v(String msg)

{

if (isDebug)

Log.v(TAG, msg);

}

// 下面是传入自定义tag的函数

public static void i(String tag, String msg)

{

if (isDebug)

Log.i(tag, msg);

}

public static void d(String tag, String msg)

{

if (isDebug)

Log.i(tag, msg);

}

public static void e(String tag, String msg)

{

if (isDebug)

Log.i(tag, msg);

}

public static void v(String tag, String msg)

{

if (isDebug)

Log.i(tag, msg);

}

}

二、Toast统一管理类 Tost.java

public class T

{

private T()

{

/* cannot be instantiated */

throw new UnsupportedOperationException("cannot be instantiated");

}

public static boolean isShow = true;

/**

* 短时间显示Toast

*/

public static void showShort(Context context, CharSequence message)

{

if (isShow)

Toast.makeText(context, message, Toast.LENGTH_SHORT).show();

}

/**

* 短时间显示Toast

* @param message 要显示的字符串资源的id

*/

public static void showShort(Context context, int message)

{

if (isShow)

Toast.makeText(context, message, Toast.LENGTH_SHORT).show();

}

/**

* 长时间显示Toast

*/

public static void showLong(Context context, CharSequence message)

{

if (isShow)

Toast.makeText(context, message, Toast.LENGTH_LONG).show();

}

/**

* 长时间显示Toast

*/

public static void showLong(Context context, int message)

{

if (isShow)

Toast.makeText(context, message, Toast.LENGTH_LONG).show();

}

/**

* 自定义显示Toast时间

*/

public static void show(Context context, CharSequence message, int duration)

{

if (isShow)

Toast.makeText(context, message, duration).show();

}

/**

* 自定义显示Toast时间

*/

public static void show(Context context, int message, int duration)

{

if (isShow)

Toast.makeText(context, message, duration).show();

}

}

三、SharedPreferences封装类 SPUtils.java 和 PreferencesUtils.java

1. SPUtils.java

public class SPUtils

{

/**

* 保存在手机里面的文件名

*/

public static final String FILE_NAME = "share_data";

/**

* 保存数据的方法,我们需要拿到保存数据的具体类型,然后根据类型调用不同的保存方法

*

* @param context

* @param key

* @param object

*/

public static void put(Context context, String key, Object object)

{

SharedPreferences sp = context.getSharedPreferences(FILE_NAME,

Context.MODE_PRIVATE);

SharedPreferences.Editor editor = sp.edit();

if (object instanceof String)

{

editor.putString(key, (String) object);

} else if (object instanceof Integer)

{

editor.putInt(key, (Integer) object);

} else if (object instanceof Boolean)

{

editor.putBoolean(key, (Boolean) object);

} else if (object instanceof Float)

{

editor.putFloat(key, (Float) object);

} else if (object instanceof Long)

{

editor.putLong(key, (Long) object);

} else

{

editor.putString(key, object.toString());

}

SharedPreferencesCompat.apply(editor);

}

/**

* 得到保存数据的方法,我们根据默认值得到保存的数据的具体类型,然后调用相对于的方法获取值

*

* @param context

* @param key

* @param defaultObject

* @return

*/

public static Object get(Context context, String key, Object defaultObject)

{

SharedPreferences sp = context.getSharedPreferences(FILE_NAME,

Context.MODE_PRIVATE);

if (defaultObject instanceof String)

{

return sp.getString(key, (String) defaultObject);

} else if (defaultObject instanceof Integer)

{

return sp.getInt(key, (Integer) defaultObject);

} else if (defaultObject instanceof Boolean)

{

return sp.getBoolean(key, (Boolean) defaultObject);

} else if (defaultObject instanceof Float)

{

return sp.getFloat(key, (Float) defaultObject);

} else if (defaultObject instanceof Long)

{

return sp.getLong(key, (Long) defaultObject);

}

return null;

}

/**

* 移除某个key值已经对应的值

* @param context

* @param key

*/

public static void remove(Context context, String key)

{

SharedPreferences sp = context.getSharedPreferences(FILE_NAME,

Context.MODE_PRIVATE);

SharedPreferences.Editor editor = sp.edit();

editor.remove(key);

SharedPreferencesCompat.apply(editor);

}

/**

* 清除所有数据

* @param context

*/

public static void clear(Context context)

{

SharedPreferences sp = context.getSharedPreferences(FILE_NAME,

Context.MODE_PRIVATE);

SharedPreferences.Editor editor = sp.edit();

editor.clear();

SharedPreferencesCompat.apply(editor);

}

/**

* 查询某个key是否已经存在

* @param context

* @param key

* @return

*/

public static boolean contains(Context context, String key)

{

SharedPreferences sp = context.getSharedPreferences(FILE_NAME,

Context.MODE_PRIVATE);

return sp.contains(key);

}

/**

* 返回所有的键值对

*

* @param context

* @return

*/

public static Map getAll(Context context)

{

SharedPreferences sp = context.getSharedPreferences(FILE_NAME,

Context.MODE_PRIVATE);

return sp.getAll();

}

/**

* 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类

*

* @author zhy

*

*/

private static class SharedPreferencesCompat

{

private static final Method sApplyMethod = findApplyMethod();

/**

* 反射查找apply的方法

*

* @return

*/

@SuppressWarnings({ "unchecked", "rawtypes" })

private static Method findApplyMethod()

{

try

{

Class clz = SharedPreferences.Editor.class;

return clz.getMethod("apply");

} catch (NoSuchMethodException e)

{

}

return null;

}

/**

* 如果找到则使用apply执行,否则使用commit

*

* @param editor

*/

public static void apply(SharedPreferences.Editor editor)

{

try

{

if (sApplyMethod != null)

{

sApplyMethod.invoke(editor);

return;

}

} catch (IllegalArgumentException e)

{

} catch (IllegalAccessException e)

{

} catch (InvocationTargetException e)

{

}

editor.commit();

}

}

}

对SharedPreference的使用做了建议的封装,对外公布出put,get,remove,clear等等方法;

注意一点,里面所有的commit操作使用了SharedPreferencesCompat.apply进行了替代,目的是尽可能的使用apply代替commit.

首先说下为什么,因为commit方法是同步的,并且我们很多时候的commit操作都是UI线程中,毕竟是IO操作,尽可能异步;

所以我们使用apply进行替代,apply异步的进行写入;

但是apply相当于commit来说是new API呢,为了更好的兼容,我们做了适配;

SharedPreferencesCompat也可以给大家创建兼容类提供了一定的参考

2. SPUtils.java

public class PreferencesUtils {

public static String PREFERENCE_NAME = "TrineaAndroidCommon";

private PreferencesUtils() {

throw new AssertionError();

}

/**

* put string preferences

*

* @param context

* @param key The name of the preference to modify

* @param value The new value for the preference

* @return True if the new values were successfully written to persistent storage.

*/

public static boolean putString(Context context, String key, String value) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

SharedPreferences.Editor editor = settings.edit();

editor.putString(key, value);

return editor.commit();

}

/**

* get string preferences

*

* @param context

* @param key The name of the preference to retrieve

* @return The preference value if it exists, or null. Throws ClassCastException if there is a preference with this

* name that is not a string

* @see #getString(Context, String, String)

*/

public static String getString(Context context, String key) {

return getString(context, key, null);

}

/**

* get string preferences

*

* @param context

* @param key The name of the preference to retrieve

* @param defaultValue Value to return if this preference does not exist

* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with

* this name that is not a string

*/

public static String getString(Context context, String key, String defaultValue) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

return settings.getString(key, defaultValue);

}

/**

* put int preferences

*

* @param context

* @param key The name of the preference to modify

* @param value The new value for the preference

* @return True if the new values were successfully written to persistent storage.

*/

public static boolean putInt(Context context, String key, int value) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

SharedPreferences.Editor editor = settings.edit();

editor.putInt(key, value);

return editor.commit();

}

/**

* get int preferences

*

* @param context

* @param key The name of the preference to retrieve

* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this

* name that is not a int

* @see #getInt(Context, String, int)

*/

public static int getInt(Context context, String key) {

return getInt(context, key, -);

}

/**

* get int preferences

*

* @param context

* @param key The name of the preference to retrieve

* @param defaultValue Value to return if this preference does not exist

* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with

* this name that is not a int

*/

public static int getInt(Context context, String key, int defaultValue) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

return settings.getInt(key, defaultValue);

}

/**

* put long preferences

*

* @param context

* @param key The name of the preference to modify

* @param value The new value for the preference

* @return True if the new values were successfully written to persistent storage.

*/

public static boolean putLong(Context context, String key, long value) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

SharedPreferences.Editor editor = settings.edit();

editor.putLong(key, value);

return editor.commit();

}

/**

* get long preferences

*

* @param context

* @param key The name of the preference to retrieve

* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this

* name that is not a long

* @see #getLong(Context, String, long)

*/

public static long getLong(Context context, String key) {

return getLong(context, key, -);

}

/**

* get long preferences

*

* @param context

* @param key The name of the preference to retrieve

* @param defaultValue Value to return if this preference does not exist

* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with

* this name that is not a long

*/

public static long getLong(Context context, String key, long defaultValue) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

return settings.getLong(key, defaultValue);

}

/**

* put float preferences

*

* @param context

* @param key The name of the preference to modify

* @param value The new value for the preference

* @return True if the new values were successfully written to persistent storage.

*/

public static boolean putFloat(Context context, String key, float value) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

SharedPreferences.Editor editor = settings.edit();

editor.putFloat(key, value);

return editor.commit();

}

/**

* get float preferences

*

* @param context

* @param key The name of the preference to retrieve

* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this

* name that is not a float

* @see #getFloat(Context, String, float)

*/

public static float getFloat(Context context, String key) {

return getFloat(context, key, -);

}

/**

* get float preferences

*

* @param context

* @param key The name of the preference to retrieve

* @param defaultValue Value to return if this preference does not exist

* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with

* this name that is not a float

*/

public static float getFloat(Context context, String key, float defaultValue) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

return settings.getFloat(key, defaultValue);

}

/**

* put boolean preferences

*

* @param context

* @param key The name of the preference to modify

* @param value The new value for the preference

* @return True if the new values were successfully written to persistent storage.

*/

public static boolean putBoolean(Context context, String key, boolean value) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

SharedPreferences.Editor editor = settings.edit();

editor.putBoolean(key, value);

return editor.commit();

}

/**

* get boolean preferences, default is false

*

* @param context

* @param key The name of the preference to retrieve

* @return The preference value if it exists, or false. Throws ClassCastException if there is a preference with this

* name that is not a boolean

* @see #getBoolean(Context, String, boolean)

*/

public static boolean getBoolean(Context context, String key) {

return getBoolean(context, key, false);

}

/**

* get boolean preferences

*

* @param context

* @param key The name of the preference to retrieve

* @param defaultValue Value to return if this preference does not exist

* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with

* this name that is not a boolean

*/

public static boolean getBoolean(Context context, String key, boolean defaultValue) {

SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);

return settings.getBoolean(key, defaultValue);

}

}

四、单位转换类 DensityUtils.java

public class DensityUtils

{

private DensityUtils()

{

/* cannot be instantiated */

throw new UnsupportedOperationException("cannot be instantiated");

}

/**

* dp转px

*

* @param context

* @param val

* @return

*/

public static int dppx(Context context, float dpVal)

{

return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,

dpVal, context.getResources().getDisplayMetrics());

}

/**

* sp转px

*

* @param context

* @param val

* @return

*/

public static int sppx(Context context, float spVal)

{

return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,

spVal, context.getResources().getDisplayMetrics());

}

/**

* px转dp

*

* @param context

* @param pxVal

* @return

*/

public static float pxdp(Context context, float pxVal)

{

final float scale = context.getResources().getDisplayMetrics().density;

return (pxVal / scale);

}

/**

* px转sp

*

* @param fontScale

* @param pxVal

* @return

*/

public static float pxsp(Context context, float pxVal)

{

return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);

}

}

TypedValue:

Container for a dynamically typed data value. Primarily used with Resources for holding resource values.

applyDimension(int unit, float value, DisplayMetrics metrics):

Converts an unpacked complex data value holding a dimension to its final floating point value.

五、SD卡相关辅助类 SDCardUtils.java

public class SDCardUtils

{

private SDCardUtils()

{

/* cannot be instantiated */

throw new UnsupportedOperationException("cannot be instantiated");

}

/**

* 判断SDCard是否可用

*

* @return

*/

public static boolean isSDCardEnable()

{

return Environment.getExternalStorageState().equals(

Environment.MEDIA_MOUNTED);

}

/**

* 获取SD卡路径

*

* @return

*/

public static String getSDCardPath()

{

return Environment.getExternalStorageDirectory().getAbsolutePath()

+ File.separator;

}

/**

* 获取SD卡的剩余容量 单位byte

*

* @return

*/

public static long getSDCardAllSize()

{

if (isSDCardEnable())

{

StatFs stat = new StatFs(getSDCardPath());

// 获取空闲的数据块的数量

long availableBlocks = (long) stat.getAvailableBlocks() - ;

// 获取单个数据块的大小(byte)

long freeBlocks = stat.getAvailableBlocks();

return freeBlocks * availableBlocks;

}

return ;

}

/**

* 获取指定路径所在空间的剩余可用容量字节数,单位byte

*

* @param filePath

* @return 容量字节 SDCard可用空间,内部存储可用空间

*/

public static long getFreeBytes(String filePath)

{

// 如果是sd卡的下的路径,则获取sd卡可用容量

if (filePath.startsWith(getSDCardPath()))

{

filePath = getSDCardPath();

} else

{// 如果是内部存储的路径,则获取内存存储的可用容量

filePath = Environment.getDataDirectory().getAbsolutePath();

}

StatFs stat = new StatFs(filePath);

long availableBlocks = (long) stat.getAvailableBlocks() - ;

return stat.getBlockSize() * availableBlocks;

}

/**

* 获取系统存储路径

*

* @return

*/

public static String getRootDirectoryPath()

{

return Environment.getRootDirectory().getAbsolutePath();

}

}

StatFs 是Android提供的一个类:

Retrieve overall information about the space on a filesystem. This is a wrapper for Unix statvfs().

检索一个文件系统的整体信息空间。这是一个Unix statvfs() 包装器

六、屏幕相关辅助类 ScreenUtils.java

public class ScreenUtils

{

private ScreenUtils()

{

/* cannot be instantiated */

throw new UnsupportedOperationException("cannot be instantiated");

}

/**

* 获得屏幕高度

*

* @param context

* @return

*/

public static int getScreenWidth(Context context)

{

WindowManager wm = (WindowManager) context

.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics outMetrics = new DisplayMetrics();

wm.getDefaultDisplay().getMetrics(outMetrics);

return outMetrics.widthPixels;

}

/**

* 获得屏幕宽度

*

* @param context

* @return

*/

public static int getScreenHeight(Context context)

{

WindowManager wm = (WindowManager) context

.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics outMetrics = new DisplayMetrics();

wm.getDefaultDisplay().getMetrics(outMetrics);

return outMetrics.heightPixels;

}

/**

* 获得状态栏的高度

*

* @param context

* @return

*/

public static int getStatusHeight(Context context)

{

int statusHeight = -;

try

{

Class> clazz = Class.forName("com.android.internal.R$dimen");

Object object = clazz.newInstance();

int height = Integer.parseInt(clazz.getField("status_bar_height")

.get(object).toString());

statusHeight = context.getResources().getDimensionPixelSize(height);

} catch (Exception e)

{

e.printStackTrace();

}

return statusHeight;

}

/**

* 获取当前屏幕截图,包含状态栏

*

* @param activity

* @return

*/

public static Bitmap snapShotWithStatusBar(Activity activity)

{

View view = activity.getWindow().getDecorView();

view.setDrawingCacheEnabled(true);

view.buildDrawingCache();

Bitmap bmp = view.getDrawingCache();

int width = getScreenWidth(activity);

int height = getScreenHeight(activity);

Bitmap bp = null;

bp = Bitmap.createBitmap(bmp, , , width, height);

view.destroyDrawingCache();

return bp;

}

/**

* 获取当前屏幕截图,不包含状态栏

*

* @param activity

* @return

*/

public static Bitmap snapShotWithoutStatusBar(Activity activity)

{

View view = activity.getWindow().getDecorView();

view.setDrawingCacheEnabled(true);

view.buildDrawingCache();

Bitmap bmp = view.getDrawingCache();

Rect frame = new Rect();

activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);

int statusBarHeight = frame.top;

int width = getScreenWidth(activity);

int height = getScreenHeight(activity);

Bitmap bp = null;

bp = Bitmap.createBitmap(bmp, , statusBarHeight, width, height

- statusBarHeight);

view.destroyDrawingCache();

return bp;

}

}

七、App相关辅助类 APPUtils.java

public class AppUtils

{

private AppUtils()

{

/* cannot be instantiated */

throw new UnsupportedOperationException("cannot be instantiated");

}

/**

* 获取应用程序名称

*/

public static String getAppName(Context context)

{

try

{

PackageManager packageManager = context.getPackageManager();

PackageInfo packageInfo = packageManager.getPackageInfo(

context.getPackageName(), );

int labelRes = packageInfo.applicationInfo.labelRes;

return context.getResources().getString(labelRes);

} catch (NameNotFoundException e)

{

e.printStackTrace();

}

return null;

}

/**

* [获取应用程序版本名称信息]

*

* @param context

* @return 当前应用的版本名称

*/

public static String getVersionName(Context context)

{

try

{

PackageManager packageManager = context.getPackageManager();

PackageInfo packageInfo = packageManager.getPackageInfo(

context.getPackageName(), );

return packageInfo.versionName;

} catch (NameNotFoundException e)

{

e.printStackTrace();

}

return null;

}

}

八、软键盘相关辅助类KeyBoardUtils.java

/**

* 打开或关闭软键盘

*/

public class KeyBoardUtils

{

/**

* 打卡软键盘

*

* @param mEditText 输入框

* @param mContext 上下文

*/

public static void openKeybord(EditText mEditText, Context mContext)

{

InputMethodManager imm = (InputMethodManager) mContext

.getSystemService(Context.INPUT_METHOD_SERVICE);

imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN);

imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,

InputMethodManager.HIDE_IMPLICIT_ONLY);

}

/**

* 关闭软键盘

*

* @param mEditText 输入框

* @param mContext 上下文

*/

public static void closeKeybord(EditText mEditText, Context mContext)

{

InputMethodManager imm = (InputMethodManager) mContext

.getSystemService(Context.INPUT_METHOD_SERVICE);

imm.hideSoftInputFromWindow(mEditText.getWindowToken(), );

}

}

九、网络相关辅助类 NetUtils.java

public class NetUtils

{

private NetUtils()

{

/* cannot be instantiated */

throw new UnsupportedOperationException("cannot be instantiated");

}

/**

* 判断网络是否连接

*/

public static boolean isConnected(Context context)

{

ConnectivityManager connectivity = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

if (null != connectivity)

{

NetworkInfo info = connectivity.getActiveNetworkInfo();

if (null != info && info.isConnected())

{

if (info.getState() == NetworkInfo.State.CONNECTED)

{

return true;

}

}

}

return false;

}

/**

* 判断是否是wifi连接

*/

public static boolean isWifi(Context context)

{

ConnectivityManager cm = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

if (cm == null)

return false;

return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;

}

/**

* 打开网络设置界面

*/

public static void openSetting(Activity activity)

{

Intent intent = new Intent("/");

ComponentName cm = new ComponentName("com.android.settings",

"com.android.settings.WirelessSettings");

intent.setComponent(cm);

intent.setAction("android.intent.action.VIEW");

activity.startActivityForResult(intent, );

}

}

十、Http相关辅助类 HttpUtils.java

/**

* Http请求的工具类

*/

public class HttpUtils

{

private static final int TIMEOUT_IN_MILLIONS = ;

public interface CallBack

{

void onRequestComplete(String result);

}

/**

* 异步的Get请求

*

* @param urlStr

* @param callBack

*/

public static void doGetAsyn(final String urlStr, final CallBack callBack)

{

new Thread()

{

public void run()

{

try

{

String result = doGet(urlStr);

if (callBack != null)

{

callBack.onRequestComplete(result);

}

} catch (Exception e)

{

e.printStackTrace();

}

};

}.start();

}

/**

* 异步的Post请求

* @param urlStr

* @param params

* @param callBack

* @throws Exception

*/

public static void doPostAsyn(final String urlStr, final String params,

final CallBack callBack) throws Exception

{

new Thread()

{

public void run()

{

try

{

String result = doPost(urlStr, params);

if (callBack != null)

{

callBack.onRequestComplete(result);

}

} catch (Exception e)

{

e.printStackTrace();

}

};

}.start();

}

/**

* Get请求,获得返回数据

*

* @param urlStr

* @return

* @throws Exception

*/

public static String doGet(String urlStr)

{

URL url = null;

HttpURLConnection conn = null;

InputStream is = null;

ByteArrayOutputStream baos = null;

try

{

url = new URL(urlStr);

conn = (HttpURLConnection) url.openConnection();

conn.setReadTimeout(TIMEOUT_IN_MILLIONS);

conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

conn.setRequestMethod("GET");

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

if (conn.getResponseCode() == )

{

is = conn.getInputStream();

baos = new ByteArrayOutputStream();

int len = -;

byte[] buf = new byte[];

while ((len = is.read(buf)) != -)

{

baos.write(buf, , len);

}

baos.flush();

return baos.toString();

} else

{

throw new RuntimeException(" responseCode is not ... ");

}

} catch (Exception e)

{

e.printStackTrace();

} finally

{

try

{

if (is != null)

is.close();

} catch (IOException e)

{

}

try

{

if (baos != null)

baos.close();

} catch (IOException e)

{

}

conn.disconnect();

}

return null ;

}

/**

* 向指定 URL 发送POST方法的请求

*

* @param url

* 发送请求的 URL

* @param param

* 请求参数,请求参数应该是 name=value&name=value 的形式。

* @return 所代表远程资源的响应结果

* @throws Exception

*/

public static String doPost(String url, String param)

{

PrintWriter out = null;

BufferedReader in = null;

String result = "";

try

{

URL realUrl = new URL(url);

// 打开和URL之间的连接

HttpURLConnection conn = (HttpURLConnection) realUrl

.openConnection();

// 设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestMethod("POST");

conn.setRequestProperty("Content-Type",

"application/x-www-form-urlencoded");

conn.setRequestProperty("charset", "utf-");

conn.setUseCaches(false);

// 发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setReadTimeout(TIMEOUT_IN_MILLIONS);

conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

if (param != null && !param.trim().equals(""))

{

// 获取URLConnection对象对应的输出流

out = new PrintWriter(conn.getOutputStream());

// 发送请求参数

out.print(param);

// flush输出流的缓冲

out.flush();

}

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine()) != null)

{

result += line;

}

} catch (Exception e)

{

e.printStackTrace();

}

// 使用finally块来关闭输出流、输入流

finally

{

try

{

if (out != null)

{

out.close();

}

if (in != null)

{

in.close();

}

} catch (IOException ex)

{

ex.printStackTrace();

}

}

return result;

}

}

十一、时间工具类 TimeUtils.java

public class TimeUtils {

public static final SimpleDateFormat DEFAULT_DATE_FORMAT =

new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

public static final SimpleDateFormat DATE_FORMAT_DATE =

new SimpleDateFormat("yyyy-MM-dd");

private TimeUtils() {

throw new AssertionError();

}

/**

* long time to string

*

* @param timeInMillis

* @param dateFormat

* @return

*/

public static String getTime(long timeInMillis, SimpleDateFormat dateFormat) {

return dateFormat.format(new Date(timeInMillis));

}

/**

* long time to string, format is {@link #DEFAULT_DATE_FORMAT}

*

* @param timeInMillis

* @return

*/

public static String getTime(long timeInMillis) {

return getTime(timeInMillis, DEFAULT_DATE_FORMAT);

}

/**

* get current time in milliseconds

*

* @return

*/

public static long getCurrentTimeInLong() {

return System.currentTimeMillis();

}

/**

* get current time in milliseconds, format is {@link #DEFAULT_DATE_FORMAT}

*

* @return

*/

public static String getCurrentTimeInString() {

return getTime(getCurrentTimeInLong());

}

/**

* get current time in milliseconds

*

* @return

*/

public static String getCurrentTimeInString(SimpleDateFormat dateFormat) {

return getTime(getCurrentTimeInLong(), dateFormat);

}

}

十二、文件工具类 FileUtils.java

public class FileUtils {

public final static String FILE_EXTENSION_SEPARATOR = ".";

private FileUtils() {

throw new AssertionError();

}

/**

* read file

*

* @param filePath

* @param charsetName The name of a supported {@link java.nio.charset.Charset charset}

* @return if file not exist, return null, else return content of file

* @throws RuntimeException if an error occurs while operator BufferedReader

*/

public static StringBuilder readFile(String filePath, String charsetName) {

File file = new File(filePath);

StringBuilder fileContent = new StringBuilder("");

if (file == null || !file.isFile()) {

return null;

}

BufferedReader reader = null;

try {

InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);

reader = new BufferedReader(is);

String line = null;

while ((line = reader.readLine()) != null) {

if (!fileContent.toString().equals("")) {

fileContent.append("\r\n");

}

fileContent.append(line);

}

return fileContent;

} catch (IOException e) {

throw new RuntimeException("IOException occurred. ", e);

} finally {

IOUtils.close(reader);

}

}

/**

* write file

*

* @param filePath

* @param content

* @param append is append, if true, write to the end of file, else clear content of file and write into it

* @return return false if content is empty, true otherwise

* @throws RuntimeException if an error occurs while operator FileWriter

*/

public static boolean writeFile(String filePath, String content, boolean append) {

if (StringUtils.isEmpty(content)) {

return false;

}

FileWriter fileWriter = null;

try {

makeDirs(filePath);

fileWriter = new FileWriter(filePath, append);

fileWriter.write(content);

return true;

} catch (IOException e) {

throw new RuntimeException("IOException occurred. ", e);

} finally {

IOUtils.close(fileWriter);

}

}

/**

* write file

*

* @param filePath

* @param contentList

* @param append is append, if true, write to the end of file, else clear content of file and write into it

* @return return false if contentList is empty, true otherwise

* @throws RuntimeException if an error occurs while operator FileWriter

*/

public static boolean writeFile(String filePath, List contentList, boolean append) {

if (ListUtils.isEmpty(contentList)) {

return false;

}

FileWriter fileWriter = null;

try {

makeDirs(filePath);

fileWriter = new FileWriter(filePath, append);

int i = ;

for (String line : contentList) {

if (i++ > ) {

fileWriter.write("\r\n");

}

fileWriter.write(line);

}

return true;

} catch (IOException e) {

throw new RuntimeException("IOException occurred. ", e);

} finally {

IOUtils.close(fileWriter);

}

}

/**

* write file, the string will be written to the begin of the file

*

* @param filePath

* @param content

* @return

*/

public static boolean writeFile(String filePath, String content) {

return writeFile(filePath, content, false);

}

/**

* write file, the string list will be written to the begin of the file

*

* @param filePath

* @param contentList

* @return

*/

public static boolean writeFile(String filePath, List contentList) {

return writeFile(filePath, contentList, false);

}

/**

* write file, the bytes will be written to the begin of the file

*

* @param filePath

* @param stream

* @return

* @see {@link #writeFile(String, InputStream, boolean)}

*/

public static boolean writeFile(String filePath, InputStream stream) {

return writeFile(filePath, stream, false);

}

/**

* write file

*

* @param file the file to be opened for writing.

* @param stream the input stream

* @param append if true, then bytes will be written to the end of the file rather than the beginning

* @return return true

* @throws RuntimeException if an error occurs while operator FileOutputStream

*/

public static boolean writeFile(String filePath, InputStream stream, boolean append) {

return writeFile(filePath != null ? new File(filePath) : null, stream, append);

}

/**

* write file, the bytes will be written to the begin of the file

*

* @param file

* @param stream

* @return

* @see {@link #writeFile(File, InputStream, boolean)}

*/

public static boolean writeFile(File file, InputStream stream) {

return writeFile(file, stream, false);

}

/**

* write file

*

* @param file the file to be opened for writing.

* @param stream the input stream

* @param append if true, then bytes will be written to the end of the file rather than the beginning

* @return return true

* @throws RuntimeException if an error occurs while operator FileOutputStream

*/

public static boolean writeFile(File file, InputStream stream, boolean append) {

OutputStream o = null;

try {

makeDirs(file.getAbsolutePath());

o = new FileOutputStream(file, append);

byte data[] = new byte[];

int length = -;

while ((length = stream.read(data)) != -) {

o.write(data, , length);

}

o.flush();

return true;

} catch (FileNotFoundException e) {

throw new RuntimeException("FileNotFoundException occurred. ", e);

} catch (IOException e) {

throw new RuntimeException("IOException occurred. ", e);

} finally {

IOUtils.close(o);

IOUtils.close(stream);

}

}

/**

* move file

*

* @param sourceFilePath

* @param destFilePath

*/

public static void moveFile(String sourceFilePath, String destFilePath) {

if (TextUtils.isEmpty(sourceFilePath) || TextUtils.isEmpty(destFilePath)) {

throw new RuntimeException("Both sourceFilePath and destFilePath cannot be null.");

}

moveFile(new File(sourceFilePath), new File(destFilePath));

}

/**

* move file

*

* @param srcFile

* @param destFile

*/

public static void moveFile(File srcFile, File destFile) {

boolean rename = srcFile.renameTo(destFile);

if (!rename) {

copyFile(srcFile.getAbsolutePath(), destFile.getAbsolutePath());

deleteFile(srcFile.getAbsolutePath());

}

}

/**

* copy file

*

* @param sourceFilePath

* @param destFilePath

* @return

* @throws RuntimeException if an error occurs while operator FileOutputStream

*/

public static boolean copyFile(String sourceFilePath, String destFilePath) {

InputStream inputStream = null;

try {

inputStream = new FileInputStream(sourceFilePath);

} catch (FileNotFoundException e) {

throw new RuntimeException("FileNotFoundException occurred. ", e);

}

return writeFile(destFilePath, inputStream);

}

/**

* read file to string list, a element of list is a line

*

* @param filePath

* @param charsetName The name of a supported {@link java.nio.charset.Charset charset}

* @return if file not exist, return null, else return content of file

* @throws RuntimeException if an error occurs while operator BufferedReader

*/

public static List readFileToList(String filePath, String charsetName) {

File file = new File(filePath);

List fileContent = new ArrayList();

if (file == null || !file.isFile()) {

return null;

}

BufferedReader reader = null;

try {

InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);

reader = new BufferedReader(is);

String line = null;

while ((line = reader.readLine()) != null) {

fileContent.add(line);

}

return fileContent;

} catch (IOException e) {

throw new RuntimeException("IOException occurred. ", e);

} finally {

IOUtils.close(reader);

}

}

/**

* get file name from path, not include suffix

*

*


* getFileNameWithoutExtension(null) = null

* getFileNameWithoutExtension("") = ""

* getFileNameWithoutExtension(" ") = " "

* getFileNameWithoutExtension("abc") = "abc"

* getFileNameWithoutExtension("a.mp") = "a"

* getFileNameWithoutExtension("a.b.rmvb") = "a.b"

* getFileNameWithoutExtension("c:\\") = ""

* getFileNameWithoutExtension("c:\\a") = "a"

* getFileNameWithoutExtension("c:\\a.b") = "a"

* getFileNameWithoutExtension("c:a.txt\\a") = "a"

* getFileNameWithoutExtension("/home/admin") = "admin"

* getFileNameWithoutExtension("/home/admin/a.txt/b.mp") = "b"

*

*

* @param filePath

* @return file name from path, not include suffix

* @see

*/

public static String getFileNameWithoutExtension(String filePath) {

if (StringUtils.isEmpty(filePath)) {

return filePath;

}

int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);

int filePosi = filePath.lastIndexOf(File.separator);

if (filePosi == -) {

return (extenPosi == - ? filePath : filePath.substring(, extenPosi));

}

if (extenPosi == -) {

return filePath.substring(filePosi + );

}

return (filePosi < extenPosi ? filePath.substring(filePosi + , extenPosi) : filePath.substring(filePosi + ));

}

/**

* get file name from path, include suffix

*

*


* getFileName(null) = null

* getFileName("") = ""

* getFileName(" ") = " "

* getFileName("a.mp") = "a.mp"

* getFileName("a.b.rmvb") = "a.b.rmvb"

* getFileName("abc") = "abc"

* getFileName("c:\\") = ""

* getFileName("c:\\a") = "a"

* getFileName("c:\\a.b") = "a.b"

* getFileName("c:a.txt\\a") = "a"

* getFileName("/home/admin") = "admin"

* getFileName("/home/admin/a.txt/b.mp") = "b.mp"

*

*

* @param filePath

* @return file name from path, include suffix

*/

public static String getFileName(String filePath) {

if (StringUtils.isEmpty(filePath)) {

return filePath;

}

int filePosi = filePath.lastIndexOf(File.separator);

return (filePosi == -) ? filePath : filePath.substring(filePosi + );

}

/**

* get folder name from path

*

*


* getFolderName(null) = null

* getFolderName("") = ""

* getFolderName(" ") = ""

* getFolderName("a.mp") = ""

* getFolderName("a.b.rmvb") = ""

* getFolderName("abc") = ""

* getFolderName("c:\\") = "c:"

* getFolderName("c:\\a") = "c:"

* getFolderName("c:\\a.b") = "c:"

* getFolderName("c:a.txt\\a") = "c:a.txt"

* getFolderName("c:a\\b\\c\\d.txt") = "c:a\\b\\c"

* getFolderName("/home/admin") = "/home"

* getFolderName("/home/admin/a.txt/b.mp") = "/home/admin/a.txt"

*

*

* @param filePath

* @return

*/

public static String getFolderName(String filePath) {

if (StringUtils.isEmpty(filePath)) {

return filePath;

}

int filePosi = filePath.lastIndexOf(File.separator);

return (filePosi == -) ? "" : filePath.substring(, filePosi);

}

/**

* get suffix of file from path

*

*


* getFileExtension(null) = ""

* getFileExtension("") = ""

* getFileExtension(" ") = " "

* getFileExtension("a.mp") = "mp"

* getFileExtension("a.b.rmvb") = "rmvb"

* getFileExtension("abc") = ""

* getFileExtension("c:\\") = ""

* getFileExtension("c:\\a") = ""

* getFileExtension("c:\\a.b") = "b"

* getFileExtension("c:a.txt\\a") = ""

* getFileExtension("/home/admin") = ""

* getFileExtension("/home/admin/a.txt/b") = ""

* getFileExtension("/home/admin/a.txt/b.mp") = "mp"

*

*

* @param filePath

* @return

*/

public static String getFileExtension(String filePath) {

if (StringUtils.isBlank(filePath)) {

return filePath;

}

int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);

int filePosi = filePath.lastIndexOf(File.separator);

if (extenPosi == -) {

return "";

}

return (filePosi >= extenPosi) ? "" : filePath.substring(extenPosi + );

}

/**

* Creates the directory named by the trailing filename of this file, including the complete directory path required

* to create this directory.

*

*

* Attentions:

*

makeDirs("C:\\Users\\Trinea") can only create users folder

*

makeFolder("C:\\Users\\Trinea\\") can create Trinea folder

*

*

* @param filePath

* @return true if the necessary directories have been created or the target directory already exists, false one of

* the directories can not be created.

*

*

if {@link FileUtils#getFolderName(String)} return null, return false

*

if target directory already exists, return true

*

return {@link java.io.File#makeFolder}

*

*/

public static boolean makeDirs(String filePath) {

String folderName = getFolderName(filePath);

if (StringUtils.isEmpty(folderName)) {

return false;

}

File folder = new File(folderName);

return (folder.exists() && folder.isDirectory()) ? true : folder.mkdirs();

}

/**

* @param filePath

* @return

* @see #makeDirs(String)

*/

public static boolean makeFolders(String filePath) {

return makeDirs(filePath);

}

/**

* Indicates if this file represents a file on the underlying file system.

*

* @param filePath

* @return

*/

public static boolean isFileExist(String filePath) {

if (StringUtils.isBlank(filePath)) {

return false;

}

File file = new File(filePath);

return (file.exists() && file.isFile());

}

/**

* Indicates if this file represents a directory on the underlying file system.

*

* @param directoryPath

* @return

*/

public static boolean isFolderExist(String directoryPath) {

if (StringUtils.isBlank(directoryPath)) {

return false;

}

File dire = new File(directoryPath);

return (dire.exists() && dire.isDirectory());

}

/**

* delete file or directory

*

*

if path is null or empty, return true

*

if path not exist, return true

*

if path exist, delete recursion. return true

*

*

* @param path

* @return

*/

public static boolean deleteFile(String path) {

if (StringUtils.isBlank(path)) {

return true;

}

File file = new File(path);

if (!file.exists()) {

return true;

}

if (file.isFile()) {

return file.delete();

}

if (!file.isDirectory()) {

return false;

}

for (File f : file.listFiles()) {

if (f.isFile()) {

f.delete();

} else if (f.isDirectory()) {

deleteFile(f.getAbsolutePath());

}

}

return file.delete();

}

/**

* get file size

*

*

if path is null or empty, return -

*

if path exist and it is a file, return file size, else return -

*

*

* @param path

* @return returns the length of this file in bytes. returns - if the file does not exist.

*/

public static long getFileSize(String path) {

if (StringUtils.isBlank(path)) {

return -;

}

File file = new File(path);

return (file.exists() && file.isFile() ? file.length() : -);

}

}

十三、assets和raw资源工具类 ResourceUtils.java

public class ResourceUtils {

private ResourceUtils() {

throw new AssertionError();

}

/**

* get an asset using ACCESS_STREAMING mode. This provides access to files that have been bundled with an

* application as assets -- that is, files placed in to the "assets" directory.

*

* @param context

* @param fileName The name of the asset to open. This name can be hierarchical.

* @return

*/

public static String geFileFromAssets(Context context, String fileName) {

if (context == null || StringUtils.isEmpty(fileName)) {

return null;

}

StringBuilder s = new StringBuilder("");

try {

InputStreamReader in = new InputStreamReader(context.getResources().getAssets().open(fileName));

BufferedReader br = new BufferedReader(in);

String line;

while ((line = br.readLine()) != null) {

s.append(line);

}

return s.toString();

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

/**

* get content from a raw resource. This can only be used with resources whose value is the name of an asset files

* -- that is, it can be used to open drawable, sound, and raw resources; it will fail on string and color

* resources.

*

* @param context

* @param resId The resource identifier to open, as generated by the appt tool.

* @return

*/

public static String geFileFromRaw(Context context, int resId) {

if (context == null) {

return null;

}

StringBuilder s = new StringBuilder();

try {

InputStreamReader in = new InputStreamReader(context.getResources().openRawResource(resId));

BufferedReader br = new BufferedReader(in);

String line;

while ((line = br.readLine()) != null) {

s.append(line);

}

return s.toString();

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

/**

* same to {@link ResourceUtils#geFileFromAssets(Context, String)}, but return type is List

*

* @param context

* @param fileName

* @return

*/

public static List geFileToListFromAssets(Context context, String fileName) {

if (context == null || StringUtils.isEmpty(fileName)) {

return null;

}

List fileContent = new ArrayList();

try {

InputStreamReader in = new InputStreamReader(context.getResources().getAssets().open(fileName));

BufferedReader br = new BufferedReader(in);

String line;

while ((line = br.readLine()) != null) {

fileContent.add(line);

}

br.close();

return fileContent;

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

/**

* same to {@link ResourceUtils#geFileFromRaw(Context, int)}, but return type is List

*

* @param context

* @param resId

* @return

*/

public static List geFileToListFromRaw(Context context, int resId) {

if (context == null) {

return null;

}

List fileContent = new ArrayList();

BufferedReader reader = null;

try {

InputStreamReader in = new InputStreamReader(context.getResources().openRawResource(resId));

reader = new BufferedReader(in);

String line = null;

while ((line = reader.readLine()) != null) {

fileContent.add(line);

}

reader.close();

return fileContent;

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

}

十四、单例工具类 SingletonUtils.java

public abstract class SingletonUtils {

private T instance;

protected abstract T newInstance();

public final T getInstance() {

if (instance == null) {

synchronized (SingletonUtils.class) {

if (instance == null) {

instance = newInstance();

}

}

}

return instance;

}

}

十五、数据库工具类 SqliteUtils.java

public class SqliteUtils {

private static volatile SqliteUtils instance;

private DbHelper dbHelper;

private SQLiteDatabase db;

private SqliteUtils(Context context) {

dbHelper = new DbHelper(context);

db = dbHelper.getWritableDatabase();

}

public static SqliteUtils getInstance(Context context) {

if (instance == null) {

synchronized (SqliteUtils.class) {

if (instance == null) {

instance = new SqliteUtils(context);

}

}

}

return instance;

}

public SQLiteDatabase getDb() {

return db;

}

}

THE END

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