Android安卓---Hellword 简单提示框

package com.example.myapplication;

import android.app.AlertDialog;
import android.content.Context;
import android.widget.Toast;

public class com {

  //提示信息
  public static void ShowMsg(String msg,Context context) {
        AlertDialog.Builder dlg = new AlertDialog.Builder(context);
        dlg.setTitle("提示");
        dlg.setMessage(msg);
        dlg.setPositiveButton("确定",null);
        dlg.show();
  }
  
  //闪现提示
  public static void DisplayToast(String msg,Context context) {
    Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
  }
}

public void btn_clicked(View view){
        com.ShowMsg("这是提示框",MainActivity.this);
        com.DisplayToast("这是闪现提示",getBaseContext());
    }