Android-Service奔溃-使用IntentService

public class MyService extends Service {
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        //改方法内执行ANR（Application Not Responding）异常
        Long endTime = System.currentTimeMillis() + 20 * 1000;
        Log.v("myService","onStart");
        while (System.currentTimeMillis() < endTime){
            synchronized (this){
                try {
                    wait(endTime - System.currentTimeMillis());
                }catch (Exception e){

                }
            }
        }
        Log.v("myService","--耗时任务执行完成--");
        return START_STICKY;
    }
}

public class MyIntentService extends IntentService {
    // TODO: Rename actions, choose action names that describe tasks that this
    // IntentService can perform, e.g. ACTION_FETCH_NEW_ITEMS
    private static final String ACTION_FOO = "com.example.a30797.servietest.action.FOO";
    private static final String ACTION_BAZ = "com.example.a30797.servietest.action.BAZ";

    // TODO: Rename parameters
    private static final String EXTRA_PARAM1 = "com.example.a30797.servietest.extra.PARAM1";
    private static final String EXTRA_PARAM2 = "com.example.a30797.servietest.extra.PARAM2";

    public MyIntentService() {
        super("MyIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        //该方法内可以执行耗时任务
        long endTime = System.currentTimeMillis() + 20 * 1000;
        Log.v("myService","onStartCommand");
        while (System.currentTimeMillis() < endTime){
            synchronized (this){
                try {
                    wait(endTime - System.currentTimeMillis());
                }catch (Exception e){

                }
            }
        }
        Log.v("myService","耗时任务执行完成");
    }

    /**
     * Handle action Foo in the provided background thread with the provided
     * parameters.
     */
    private void handleActionFoo(String param1, String param2) {
        // TODO: Handle action Foo
        throw new UnsupportedOperationException("Not yet implemented");
    }

    /**
     * Handle action Baz in the provided background thread with the provided
     * parameters.
     */
    private void handleActionBaz(String param1, String param2) {
        // TODO: Handle action Baz
        throw new UnsupportedOperationException("Not yet implemented");
    }
}

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void startService(View Scource){
        //需要启动的Service的Intent
        Intent intent = new Intent(this,MyService.class);
        //启动Service
        startService(intent);
    }
    public void startIntentService(View source){
        //创建需要IntentService 的Intent
        Intent intent = new Intent(this,MyIntentService.class);
        //启动IntentService
        startService(intent);
    }
}