按钮返回MainActivity并结束所有正在运行的儿童活动

Question

package pap.crowslanding;


public class Game extends MainActivity implements OnClickListener {
private MazeBall ball;
protected static GameView gameV;

@Override
public void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.tester1);
    Button settings = (Button) findViewById(R.id.settingsButton);
    Button mainMenu = (Button) findViewById(R.id.backButton);

    ball = (MazeBall) findViewById(R.id.mazeball);
    gameV = (GameView) findViewById(R.id.game_view);

    settings.setOnClickListener(this);
       mainMenu.setOnClickListener(this);

      //Unrequired code removed

    // IF USER PRESSES ON !Main Menu!
    public void onClick(View v) {
        switch (v.getId()){
        case R.id.settingsButton:

        break;
        case R.id.backButton:
            onBackPressed();
        break;
    }
    }

public void onBackPressed() {
    this.finish();//try activityname.finish instead of this
    Intent intent = new Intent(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_HOME);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
}
}

Answer 1

我认为你可以把每个启动活动放在一个堆栈中，每次你回到你的主活动。

这里有一个类，我用它来管理我的一个应用程序中的所有活动，每次我输入一个活动，在它的onCreate方法中，我调用它的addActivity（）方法将活动放入堆栈。每次快速执行一个活动时，在它的onDestory方法中，我都会调用Manager的finishActivity方法来完成Stack中最后一个输入活动。在您的例子中，我认为您可以创建一个方法来弹出并完成所有晚于MainActivity进入堆栈的活动，并在每次返回MainActivity时调用该方法。

公共类AppManager{

private static Stack<Activity> activityStack;
private static AppManager instance;

private AppManager(){
}

public static AppManager getInstance() {
    if(instance == null)
        instance = new AppManager();
    return instance;
}

public void addActivity(Activity ac) {
    if(activityStack == null)
        activityStack = new Stack<Activity>();
    activityStack.add(ac);
}

public Activity getCurrentActivity(){
    if(activityStack == null)
        return null;
    return activityStack.lastElement();
}

public void finishActivity(Activity ac) {
    if(activityStack != null && ac != null){
        activityStack.remove(ac);
        ac.finish();
        ac = null;
    }
}

public void finishActivity() {
    if(activityStack != null) {
        Activity ac = activityStack.lastElement();
        finishActivity(ac);
    }
}

public void finishActivity(Class<?> cls) {
    if(activityStack == null)
        return;
    for(Activity ac: activityStack){
        if(ac.getClass().equals(cls)){
            finishActivity(ac);
        }
    }
}

public void finishAllActivity(){
    if(activityStack == null)
        return;
    Activity ac;
    for(int i = 0, size = activityStack.size(); i < size; i ++) {
        ac = activityStack.get(i);
        if(ac != null) {
            ac.finish();
        }
    }
    activityStack.clear();
}

public void appExit(Context context) {
    try {
        finishAllActivity();
        System.exit(0);
    } catch (Exception e) {
        Log.e("AppManager", "exit error:" + e.getMessage());
    }
}