android中的提示信息显示方法（toast应用）

android中toast的应用：

本程序实现了用户点击按钮，桌面显示用户在程序中设定好的提示信息

package com.dou.button.activity;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity

{

private Button btn1 =null;

private Button btn2 =null;

@Override

public void onCreate(BundlesavedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//确定按钮的操作代码

btn1 =(Button)findViewById(R.id.btn1);

btn1.setOnClickListener(newOnClickListener()

{

public voidonClick(View v)

{

Toast.makeText(MainActivity.this,"你点击了确定按钮",Toast.LENGTH_LONG ).show();

}

});

//推出按钮的操作代码

btn2 =(Button)findViewById(R.id.btn2);

btn2.setOnClickListener(newOnClickListener()

{

public voidonClick(View v)

{

Toast.makeText(MainActivity.this,"你点击了退出按钮", Toast.LENGTH_LONG).show();

}

});

}

}

注：当有多个按钮时以上代码会显得冗余，可以进行修改，修改完成后的代码为以下

package com.dou.button.activity;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity

{

private Button btn1 = null;

private Button btn2 = null;

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//确定按钮的操作代码

btn1 = (Button)findViewById(R.id.btn1);

btn2 = (Button)findViewById(R.id.btn2);

btn1.setOnClickListener(listener);

btn2.setOnClickListener(listener);

}

private OnClickListener listener = new OnClickListener()

{

public void onClick(View v)

{

Button btn = (Button)v;

switch(btn.getId())

{

case R.id.btn1:

Toast.makeText(MainActivity.this, "你点击了确定按钮",Toast.LENGTH_LONG).show();

break;

case R.id.btn2:

Toast.makeText(MainActivity.this, "你点击了退出按钮",Toast.LENGTH_LONG).show();

break;

}

}

};