Java-Android SDK-savedInstanceState 和 onSaveInstanceState

Question

我试图保存计数器的状态(mCreate、mRestart...等)并在 onCreate() 方法建立后加载它们。由于某种原因，每当调用 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