Android开发实战：点击按钮显示一个带有“取消”和“确定”两个选项的对话框

操作环境

Windows 10
Android Developer Tools (Build: v22.2.1-833290)
Android 4.3

代码

res/layout/activity_main.xml 代码如下：

<pre class="wp-block-code"><code><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="90dp"
        android:text="点击开启一个对话框"
        android:onClick="onclick" />

</RelativeLayout></code></pre>

src/com/example/duihuakuang/MainActivity.java 代码如下：

package com.example.duihuakuang;


import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	
	public void onclick(View view)
	{
		AlertDialog.Builder builder = new Builder(this);
		builder.setIcon(null);//设置图标, 这里设为空值
		builder.setTitle("ZhaoKaifeng.com");
		builder.setMessage("确定要取消吗");
		builder.setPositiveButton("确定", new OnClickListener(){
			
			public void onClick(DialogInterface arg0, int arg1){
				Toast.makeText(MainActivity.this,"确定成功！",Toast.LENGTH_SHORT).show();
			}
		});
		
		builder.setNegativeButton("取消", new OnClickListener(){
			public void onClick(DialogInterface arg0,int arg1){
				Toast.makeText(MainActivity.this, "取消成功！", Toast.LENGTH_SHORT).show();
			}
		});
		AlertDialog b = builder.create();
		b.show();//显示对话框
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}