Android 判断包名判断是否为系统应用的方法

package com.giada.android_demo;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
 
public class MainActivity extends AppCompatActivity {
    Context context;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        context = getApplicationContext();
 
 
        Log.v("android_demo","is com.giada.android_demo system app? "+
        isSystemApplication(context,"com.giada.android_demo"));
 
        Log.v("android_demo","is com.android.phone system app? "+
        isSystemApplication(context,"com.android.phone"));
    }
 
    public static boolean isSystemApplication(Context context, String packageName){
        PackageManager mPackageManager = context.getPackageManager();
        try {
            final PackageInfo packageInfo = 
            mPackageManager.getPackageInfo(packageName, PackageManager.GET_CONFIGURATIONS);
            if((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM)!=0){
                return true;
            }
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return false;
    }
    
}