android - 无法清除所有以前的活动并跳出应用程序

Question

我打了电话

Intent intent = new Intent(activity, Main_AllLatestNews.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
activity.startActivity(intent);

但是，当我在课堂上单击后退按钮时Main_AllLatestNews，它应该退出应用程序而不是返回到以前的活动。

Answer 1

Backpressed destroy the current activity 

public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
            // do something on back.
            this.finish();
            Intent intent = new Intent(activity, Main_AllLatestNews.class);

            startActivity(intent);
            return true;
        }

        return super.onKeyDown(keyCode, event);
    }

Answer 2

试试这个：

Intent intent = new Intent(activity, Main_AllLatestNews.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
activity.startActivity(intent);
activity.finish();

Answer 3

在活动 D 中使用代码如下所示

 public boolean onKeyDown(int keyCode, KeyEvent event) {
     if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        this.finish();
        Intent i = new Intent(Dactivity.this, AActivity.class);
        i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(i);
        return true;
    }

    return super.onKeyDown(keyCode, event);
}