Android service里面启动activity和alertdialog .

1. 启动activity源码:(记得要加上Intent.FLAG_ACTIVITY_NEW_TASK)

   1. Intent intent = new Intent();
   2. intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
   3. intent.setClass(getApplicationContext(),FileBrowserActivity.class);
   4. startActivity(intent);

   启动alertDialog源码:

   1. AlertDialog.Builder builder = new AlertDialog.Builder(this);
   2. builder.setMessage("是否接受文件?")
   3. .setPositiveButton("是", new DialogInterface.OnClickListener() {
   4. @Override
   5. publicvoid onClick(DialogInterface dialog, int which) {
   6. 
      
   7. }
   8. }).setNegativeButton("否", new OnClickListener() {
   9. @Override
   10. publicvoid onClick(DialogInterface dialog, int which) {
   11. }
   12. });
   13. AlertDialog ad = builder.create();
   14. // ad.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG); //系统中关机对话框就是这个属性
   15. ad.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
   16. ad.setCanceledOnTouchOutside(false); //点击外面区域不会让dialog消失
   17. ad.show();

   还要加上权限 

   1. <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
2.