android - onResume 中 View 为空

Question

我在 onCreate 中初始化 View ，有时在最小化应用程序后，对于某些用户来说， View 为 null。我无法重现这个错误。 GuiReceiver 是更新 Activity View 的接收器。

这是我的简化代码:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.player_activity);
    tvTitle = (TextView) findViewById(R.id.title);
}

@Override
protected void onResume() {
    super.onResume();

    if (tvTitle != null)
        FirebaseCrash.log("onResume - tvTitle != null");
    else
        FirebaseCrash.log("onResume - tvTitle == null");

    IntentFilter filter = new IntentFilter();
    filter.addAction(CommonConstatns.GUI_UPDATE_ACTION);

    if (receiver == null) {
        receiver = new GuiReceiver();
        receiver.setPlayerActivity(this);
    }
}    

@Override
protected void onPause() {
    super.onPause();
    if (receiver != null) {
        unregisterReceiver(receiver);
        FirebaseCrash.log("GUIReceiver unregistered");
    }
}

<activity
    android:name=".activity.PlayerActivity"
    android:launchMode="singleTask"
    android:screenOrientation="userPortrait" />

Answer 1

除非 tvTitle 被声明为类的实例变量，否则我会将以下代码行移至 onResume 方法中:

tvTitle = (TextView) findViewById(R.id.title);