public class MainActivity extends ActionBarActivity {

	public CrashApplication application;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		application = (CrashApplication) getApplication();
		application.addAct(this);
		Button button = null;
		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub

			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}
 

public class CrashApplication extends Application {

	List<Activity> activityList = new ArrayList<Activity>();

	@Override
	public void onCreate() {
		super.onCreate();
		CrashHandler crashHandler = CrashHandler.getInstance();
		crashHandler.init(getApplicationContext());
	}

	public void addAct(Activity a) {
		activityList.add(a);
	}

	public void delAct(Activity a) {
		activityList.remove(a);
	}

	public void finishActs() {
		for (Activity a : activityList) {
			if (null != a) {
				a.finish();
			}
		}
		android.os.Process.killProcess(android.os.Process.myPid());
	}
}
 

public class CrashHandler implements UncaughtExceptionHandler {

	public static final String TAG = "CrashHandler";

	// 系統預設的UncaughtException處理類
	private Thread.UncaughtExceptionHandler mDefaultHandler;
	// CrashHandler例項
	private static CrashHandler INSTANCE = new CrashHandler();
	// 程式的Context物件
	private Context mContext;
	// 用來儲存裝置資訊和異常資訊
	private Map<String, String> infos = new HashMap<String, String>();

	// 用於格式化日期,作為日誌檔名的一部分
	private SimpleDateFormat formatter = new SimpleDateFormat(
			"yyyy-MM-dd-HH-mm-ss");

	/** 保證只有一個CrashHandler例項 */
	private CrashHandler() {
	}

	/** 獲取CrashHandler例項 ,單例模式 */
	public static CrashHandler getInstance() {
		return INSTANCE;
	}

	/**
	 * 初始化
	 * 
	 * @param context
	 */
	public void init(Context context) {
		mContext = context;
		// 獲取系統預設的UncaughtException處理器
		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
		// 設定該CrashHandler為程式的預設處理器
		Thread.setDefaultUncaughtExceptionHandler(this);
	}

	/**
	 * 當UncaughtException發生時會轉入該函式來處理
	 */
	@Override
	public void uncaughtException(Thread thread, Throwable ex) {
		if (!handleException(ex) && mDefaultHandler != null) {
			// 如果使用者沒有處理則讓系統預設的異常處理器來處理
			mDefaultHandler.uncaughtException(thread, ex);
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				Log.e(TAG, "error : ", e);
			}
			// 退出程式
			android.os.Process.killProcess(android.os.Process.myPid());
			System.exit(1);
		} else {
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				Log.e(TAG, "error : ", e);
			}
			// 退出程式

			
			((CrashApplication) mContext).finishActs();

		}
		;
	}

	/**
	 * 自定義錯誤處理,收集錯誤資訊 傳送錯誤報告等操作均在此完成.
	 * 
	 * @param ex
	 * @return true:如果處理了該異常資訊;否則返回false.
	 */
	private boolean handleException(Throwable ex) {
		if (ex == null) {
			return false;
		}
		// 使用Toast來顯示異常資訊
		new Thread() {
			@Override
			public void run() {
				Looper.prepare();
				Toast.makeText(mContext, "很抱歉,程式出現異常,即將退出.", Toast.LENGTH_LONG)
						.show();
				Looper.loop();
			}
		}.start();
		// 收集裝置引數資訊
		collectDeviceInfo(mContext);
		// 儲存日誌檔案
		saveCrashInfo2File(ex);
		return true;
	}

	/**
	 * 收集裝置引數資訊
	 * 
	 * @param ctx
	 */
	public void collectDeviceInfo(Context ctx) {
		try {
			PackageManager pm = ctx.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
					PackageManager.GET_ACTIVITIES);
			if (pi != null) {
				String versionName = pi.versionName == null ? "null"
						: pi.versionName;
				String versionCode = pi.versionCode + "";
				infos.put("versionName", versionName);
				infos.put("versionCode", versionCode);
			}
		} catch (NameNotFoundException e) {
			Log.e(TAG, "an error occured when collect package info", e);
		}
		Field[] fields = Build.class.getDeclaredFields();
		for (Field field : fields) {
			try {
				field.setAccessible(true);
				infos.put(field.getName(), field.get(null).toString());
				Log.d(TAG, field.getName() + " : " + field.get(null));
			} catch (Exception e) {
				Log.e(TAG, "an error occured when collect crash info", e);
			}
		}
	}

	/**
	 * 儲存錯誤資訊到檔案中
	 * 
	 * @param ex
	 * @return 返回檔名稱,便於將檔案傳送到伺服器
	 */
	private String saveCrashInfo2File(Throwable ex) {

		StringBuffer sb = new StringBuffer();
		for (Map.Entry<String, String> entry : infos.entrySet()) {
			String key = entry.getKey();
			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");
		}

		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null) {
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		String result = writer.toString();
		sb.append(result);
		try {
			long timestamp = System.currentTimeMillis();
			String time = formatter.format(new Date());
			String fileName = "crash-" + time + "-" + timestamp + ".log";
			if (Environment.getExternalStorageState().equals(
					Environment.MEDIA_MOUNTED)) {
				String path = "/sdcard/crash/";
				File dir = new File(path);
				if (!dir.exists()) {
					dir.mkdirs();
				}
				FileOutputStream fos = new FileOutputStream(path + fileName);
				fos.write(sb.toString().getBytes());
				fos.close();
			}
			return fileName;
		} catch (Exception e) {
			Log.e(TAG, "an error occured while writing file...", e);
		}
		return null;
	}
}