Catch Crash

CrashHandler.java

public class CrashHandler implements UncaughtExceptionHandler {

    public static final String TAG = "CrashHandler";
    private static CrashHandler INSTANCE = new CrashHandler();
    private Context mContext;
    private Thread.UncaughtExceptionHandler mDefaultHandler;

    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    public void init(Context ctx) {
        mContext = ctx;
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        System.out.println("uncaughtException");
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                new AlertDialog.Builder(mContext).setTitle("提示").setCancelable(false)
                        .setMessage("程序崩溃了...").setNeutralButton("我知道了", new OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                System.exit(0);
                            }
                        })
                        .create().show();
                Looper.loop();
            }
        }.start();
    }
}

MainActivity.java

public class MainActivity extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        CrashHandler crashHandler = CrashHandler.getInstance();  
        crashHandler.init(this);

        throw new NullPointerException();
    }
}