Android安卓-Hellword 容易提示框

1. 添加公用单元文件com..java

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();	}}

3.MainActivity.java新建方法名btn_clicked并调用com.java的方法

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