如何回到家里活动上单反压

Question

我想在单反向和双反向退出应用程序时返回主页活动，但它不能正常工作，我在下面添加了代码，请帮助我。

 if (doubleBackToExitPressedOnce) 
{
            replaceFragment(new HomeActivity());
            super.onBackPressed();
            return;
        }
        this.doubleBackToExitPressedOnce = true;
        Toast.makeText(this, "Please click BACK again to exit.", Toast.LENGTH_SHORT).show();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                doubleBackToExitPressedOnce = false;
            }
        }, 2000);

请帮帮我。

Answer 1

只需将其添加到处理程序运行方法中即可

            @Override
            public void run() {
                replaceFragment(new HomeActivity());
                ActivityName.super.onBackPressed();
                doubleBackToExitPressedOnce = false;
            }

或像这种一样制造其他方法

else{
replaceFragment(new HomeActivity());
            super.onBackPressed();
}

Answer 2

private static final int BACK_PRESS = 76;
private Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if (BACK_PRESS == msg.what) {
            goBack();
        }
    }
};
private void goBack() {
    super.onBackPressed();
}
@Override
public void onBackPressed() {
    if (mHandler.hasMessages(BACK_PRESS)) {
        mHandler.removeMessages(BACK_PRESS);
        replaceFragment(new HomeActivity());
    } else {
        mHandler.sendEmptyMessageDelayed(BACK_PRESS, 500); // Your activity will close after 500ms
    }
}

对于您的案例，您可以使用不同的处理程序。