我怎么知道应用程序何时在后台？

Question

I have an application that is a menu with several options, every option when chosen will lead to a new activity. I also have music playing in the background using a service. I want my music play continuously no matter what activity is focused.

My problem is:

• If I am NOT override onPause() or onStop(), the music will go fine when I open another activity. BUT when I press home button, music still plays.
• If I DO override onPause() or onStop(), the music will stop when I press Home button, but it also stops when another activity is opened.

So what should I do now?

Answer 1

You can override onPause() and use a boolean flag.
Set the boolean to true if you are launching a new activity. When onPause() is called you'll know if it is not true then you should stop the music.

boolean keepPlaying = false;

protected void onPause() { 
    if(!keepPlaying)
        stopService(new Intent(this, MediaPlayerServices.class)); 
    super.onPause();
}