浅析AndroidService中实现弹出对话框的坑

AlertDialog.Builder builder=new AlertDialog.Builder(getApplicationContext()); 
builder.setTitle("提示"); 
builder.setMessage("service弹框"); 
builder.setNegativeButton("明白了",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();

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");
　　　　　}
　　　} 
　　} 
}