Android—一次清除所有Activity

首先，自定义一个ActivityManager管理类，用于管理栈中的Activity

public class ActivityManager{
    private static final String TAG = "ActivityManager";
    private static Stack<Activity> activityStack;
    private static ActivityManager instance;
    private Activity currActivity;
    private ActivityManager(){
    }

    public static ActivityManager getActivityManager(){
        if(instance == null){
            instance = new ActivityManager();
        }
        return instance;
    }

    //退出栈顶Activity
    public void popActivity(Activity activity){
        if(activity == null || activityStack == null){
            return;
        }
        if(activityStack.contains(activity)){
            activityStack.remove(activity);
        }
        currActivity = activity;
        //activity.finish;

    }

    public void destoryActivity(Activity activity){
        if(activity == null){
            return;
        }
        activity.finish();
        if(activityStack.contains(activity)){
            activityStack.remove(activity);
        }
        activity=null;
    }

    //获得当前栈顶Activity
    public Activity currentActivity(){
        if(activityStack == null||activityStack.empty()){
            return null;
        }
        return activityStack.lastElement();
    }

    //将当前Activity推入栈中
    public void pushActivity(Activity activity){
        if(activityStack == null){
            activityStack = new Stack<Activity>();
        }
        activityStack.add(activity);
    }

    //退出栈中除指定的Activity外所有
    public void popAllActivityExceptOne(Class cls){
        while(true){
            Activity activity = currentActivity();
            if(activity == null){
                break;
            if(activity.getClass().equals(cls))
                break;
            destroyActivity(activity);
        }
    }

    //退出栈中所有Activity
    public void popAllActivity(){
        popAllActivityExceptOne(null);
    }

    public Activity getCurrentActivity(){
        return currActivity;
    }

    public int getActivityStackSize(){
        int size = 0;
        if(activityStack != null){
            size = activityStack.size();
        }
        return size;
    }
}

然后，在baseActivity中的两个方法添加如下方法（如果没有baseActivity，就得一个个加了）

@Override
protected void onPause(){
    super.onPause();
    ActivityManager.getActivityManager().pushActivity(this);
}

@Override
protected void onResume(){
    super.onResume();
    ActivityManager.getActivityManager().popActivity(this);
}

最后，根据需求判断，在需要清除所有activity的地方，加上如下代码

if(isRestart){
    ActivityManager.getActivityManager().popAllActivity();
    Intent intent = new Intent(this, LoadingActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(intent);
    isRestart=false;
    this.finish();
}

PS：清除掉所有activity后，startActivity时需要给它加上Intent.FLAG_ACTIVITY_CLEAR_TOP,表示start的这个activity置顶，并二次清除掉所有这个activity之上的activity。

转自：http://blog.csdn.net/a394268045/article/details/51648149