Analysis on the Pit of Pop up Dialog Box in Android Service

1. Mobile phone version problem, most articles do not cover this point, resulting in their code can not be used normally

Type required above M version-- > TYPE_APPLICATION_OVERLAY

AlertDialog.Builder builder=new AlertDialog.Builder(getApplicationContext()); 
builder.setTitle(" Prompt "); 
builder.setMessage("service Bullet frame "); 
builder.setNegativeButton(" Got it ",null); 
Dialog dialog=builder.create();

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){//6.0  　　　　　　 
  dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY);   　　　　　　 　 
}else {  　　　　　　 
  dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);   　　　　　　 　 
} 
dialog.show();

At the same time, because different versions of Android systems are involved,

It is stated in AndroidManifest. xml that permissions corresponding to both types are required

 <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
  <uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />

2. Permission problem, the pop-up dialog box in service is a system pop-up box, and you need to apply for floating window permission above M version

Suspended windows were allowed by default before Android 6.0

Pay attention to the use after Android 6.0

Because floating window permissions SYSTEM_ALERT_WINDOW It belongs to special authority and needs to apply separately

Special permissions, as the name implies, are 1 special sensitive permissions. In Android system, there are mainly two

SYSTEM_ALERT_WINDOW (set up a floating window and carry out some black technology)
WRITE_SETTINGS (Modify System Settings)

With regard to the authorization of the above two special permissions, the method is to use startActivityForResult to start the authorization interface.

Application method:

private static final int REQUEST_CODE = 1;
private void requestAlertWindowPermission() {
  Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
  intent.setData(Uri.parse("package:" + getPackageName()));
  startActivityForResult(intent, REQUEST_CODE);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if (requestCode == REQUEST_CODE) {
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     　 if (Settings.canDrawOverlays(this)) {
        　  　   　   　  Log.i("xqxinfo", "onActivityResult granted");
     　  　   　   　   　  }
   　  　   　  } 
  　  　  } 
}

Summarize