Android App Development Press the back button to rewind to background execution

Source: Internet
Author: User
Tags rewind

Reprint please indicate source: http://blog.csdn.net/kjunchen/article/details/50429694

Android App Development Press the back button to rewind to background execution

We use a lot of Android applications (such as QQ, Weibo), in the main interface of the application press the Back button, the application does not exit, but into the background to execute.

So, how is it implemented in development? I found two ways to do this:

First, the Monitoring return key

1. Rewrite the onbackpressed () method in the activity.

@OverridepublicvoidonBackPressed() {    //此处写退向后台的处理}

2. Rewrite the onkeydown () method (some application hints click the Back button again to exit the app is the article done here).

@OverridepublicbooleanonKeyDown(int keyCode, KeyEvent event) {    if (keyCode == KeyEvent.KEYCODE_BACK) {//假设返回键按下        //此处写退向后台的处理        returntrue;    }    returnsuper.onKeyDown(keyCode, event);}
Second, back to the background to execute

1, just need a word to fix, call Movetasktoback () method, this method needs to set a Boolean parameter. Ture Press the return key in whatever activity to exit and go into the background. False simply press the return key in the root activity to go back to the background execution.

moveTaskToBack(false);  

2, use intent. Return to the main phone screen.

Intent intent = new Intent(Intent.ACTION_MAIN);intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.addCategory(Intent.CATEGORY_HOME);startActivity(intent); 
Finally, a little more specific.
@OverridepublicvoidonBackPressed() {    //方式一:将此任务转向后台    moveTaskToBack(false);    //方式二:返回手机的主屏幕    /*Intent intent = new Intent(Intent.ACTION_MAIN);    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    intent.addCategory(Intent.CATEGORY_HOME);    startActivity(intent);*/

Welcome to add QQ Group Exchange:365532949

Android App Development Press the back button to rewind to background execution

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.