android 调用应用的两种方法

1. one

PackageManager packageManager = getPackageManager();
Intent  mIntent =packageManager.getLaunchIntentForPackage("com.example.flashlight");
startActivity(mIntent);

2.two

       Intent intent = new Intent();
intent.setClassName("com.example.flashlight","com.example.flashlight.Flashlight");
startActivity(intent);