"强制停止"在其生命周期中将活动留在哪里？

Question

假设我的应用程序启动并运行.然后我去我的设备主屏幕.导航到设置>>应用程序>>管理应用程序,选择我的应用程序,然后按Force stop.

Activity下次打开应用程序时会调用哪种方法？之前我骂了不检查自己,我有许多Log在我的陈述onCreate,onStart和onResume方法,但硬是没有一个中所示LogCat的应用程序重新打开时.

如果您知道状态Force stop对我的申请的答案,但缺失的Log陈述没有意义,请分享.我想可能会有一个不同的问题,除了我错过了Force stop我的计划的位置.

Android Activity LifeCycle:

的onCreate()

public void onCreate(Bundle savedInstanceState) {
    Log.i( TAG, "Whats going onnnn0" );
    // This calls all inherited methods, as this is a subclass of Activity.
    super.onCreate(savedInstanceState);
    if(D) Log.e(TAG, "+++ ON CREATE +++");
    Log.i( TAG, "Whats going onnnn" );


    // Set the view the main.xml
    setContentView(R.layout.main);
    RelayAPIModel.bluetoothConnected = false;
    // Initialize the connection.
    setupConnection();
    Log.i( TAG, "Whats going onnnn2" );

    // Check how if bluetooth is enabled on this device.
    mService.checkBluetoothState();
    // Initialize stuff from PilotMain() method
    initMain();
    Log.i( TAG, "Whats going onnnn3" );
    // Add listeners to all of the buttons described in main.xml
    buildButtons();
    Log.i( "HERE", "HERE" );
    // If the adapter is null, then Bluetooth is not supported
    if (mService.getAdapter() == null) {
        Toast.makeText(this, R.string.toast_bt_not_avail, Toast.LENGTH_LONG).show();
        finish();
        return;
    }
    savedStuff = (SerializableObjects)LocalObjects.readObjectFromFile( getApplicationContext(), "LastDevice.txt" );
    if( savedStuff != null ) {
        hasLastDevice = true;
        Log.i( "HAS", "LAST DEVICE" );
        Log.i( "HAS", savedStuff.getName() );
    } else {
        hasLastDevice = false;
        Log.i( "HAS NO", "LAST DEVICE" );
    }

    pairedDeviceList = new ArrayList<BluetoothDevice>();
    pairedDevices = mService.getAdapter().getBondedDevices();

    for( BluetoothDevice device: pairedDevices ) {
        pairedDeviceList.add( device );
    }
    if( hasLastDevice ) {
        for( int i = 0; i < pairedDeviceList.size(); i++ ) {
            Log.i( "1 HERE HERE", pairedDeviceList.get( i ).getName() );
            Log.i( "1 HEUH?I@JD", savedStuff.getName() );
            if( pairedDeviceList.get( i ).getName().equals( savedStuff.getRealName() ) ) {
                // THIS IS THE DEVICE WE NEED
                previousDevice = pairedDeviceList.get( i );
                i = pairedDeviceList.size();
            }
        }
    }

} 

在onStart()

public void onStart() {
    super.onStart();
    if(D) Log.e(TAG, "++ ON START ++");

    savedStuff = (SerializableObjects)LocalObjects.readObjectFromFile( getApplicationContext(), "LastDevice.txt" );
    if( savedStuff != null ) {
        hasLastDevice = true;
        Log.i( "HAS", "LAST DEVICE" );
        Log.i( "HAS", savedStuff.getName() );
    } else {
        hasLastDevice = false;
        Log.i( "HAS NO", "LAST DEVICE" );
    }

    pairedDeviceList = new ArrayList<BluetoothDevice>();
    pairedDevices = mService.getAdapter().getBondedDevices();

    for( BluetoothDevice device: pairedDevices ) {
        pairedDeviceList.add( device );
    }
    if( hasLastDevice ) {
        for( int i = 0; i < pairedDeviceList.size(); i++ ) {
            Log.i( "2 HERE HERE", pairedDeviceList.get( i ).getName() );
            Log.i( "2 HEUH?I@JD", savedStuff.getName() );
            if( pairedDeviceList.get( i ).getName().equals( savedStuff.getRealName() ) ) {
                // THIS IS THE DEVICE WE NEED
                previousDevice = pairedDeviceList.get( i );
                i = pairedDeviceList.size();
            }
        }
    }


    // If BT is not on, request that it be enabled.
    // setupChat() will then be called during onActivityResult
    if (!mService.getAdapter().isEnabled()) {
        Log.i( TAG, "first !isEnabled " );
        Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
        Log.i( TAG, "second !isEnabled" );
    // Otherwise, setup the connection
    } else {
        if (mService == null) {
            Log.i( TAG, "setupConnection BEFORE" );
            setupConnection();
            Log.i( TAG, "setupConnection AFTER" );
        }
    }
}

的onResume()

public synchronized void onResume() {
    Log.i( "RESUME", "HERE" );
    super.onResume();
    if(D) Log.e(TAG, "+ ON RESUME +");

    Log.i( "RESUME", "AFTER HERE" );


    // Performing this check in onResume() covers the case in which BT was
    // not enabled during onStart(), so we were paused to enable it...
    // onResume() will be called when ACTION_REQUEST_ENABLE activity returns.
    if (mService != null) {
        // Only if the state is STATE_NONE, do we know that we haven't started already
        if (mService.getState() == BluetoothService.STATE_NONE) {
          // Start the Bluetooth chat services
          mService.start();
        }
    }
}

Answer 1

当你强制停止一个应用程序时,你会彻底杀死它并且没有任何生命.没有方法被调用,没有.这与杀死应用程序以保留内存的系统不同.强制关闭并不意味着甜蜜,它意味着杀死错误的应用程序,所以它不会浪费.

因此,下次打开应用程序时,它会从头开始 - MainActivity.这就是强制停止"可能导致应用程序行为不端"的原因.您可能已经在做一些有用的事情中停止了它 - 比如写入服务器/文件系统等等.这就是为什么您应该尽可能高效地使用应用程序或者以可以处理意外关闭的方式对其进行编码.这可能意味着远离长期任务并经常快速保存.