Java-Android SDK-savedInstanceState和onSaveInstanceState

Question

我正在尝试保存计数器的状态（mCreate，mRestart ...等），并在onCreate（）方法建立后加载它们。 由于某种原因，每次调用onCreate（）时，它总是恢复为“ 0”。

// Use these as keys when you're saving state between reconfigurations
private static final String RESTART_KEY = "restart";
private static final String RESUME_KEY = "resume";
private static final String START_KEY = "start";
private static final String CREATE_KEY = "create";

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Has previous state been saved?
    if (savedInstanceState != null) {           
        this.mCreate = savedInstanceState.getInt(CREATE_KEY);
        this.mRestart = savedInstanceState.getInt(RESTART_KEY);
        this.mStart = savedInstanceState.getInt(START_KEY);
        this.mResume = savedInstanceState.getInt(RESUME_KEY);
    }
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {    
savedInstanceState.containsKey(RESTART_KEY);
savedInstanceState.containsKey(RESUME_KEY);
savedInstanceState.containsKey(START_KEY);
savedInstanceState.containsKey(CREATE_KEY);
}

Answer 1

你应该打电话

savedInstanceState.putInt(RESTART_KEY, _your_key_);

在“ onSaveInstanceState”方法中

Answer 2

我检查了这个 。 我在Bundle类中找不到任何函数“ containsKEY”。 但是我认为你应该使用

    savedInstanceState.putString("restartkey",RESTART_KEY);
    savedInstanceState.putInt("resumekey",RESUME_KEY);
    savedInstanceState.putBoolean("startkey",START_KEY);
    savedInstanceState.addString("createkey",CREATE_KEY);