使用AlertDialog创建对话框
AlertDialog的功能非常强大，它不仅可以生产带按钮的提示对话框，还可以生成带列表的列表对话框，概况起来有一下4种：1.带确定，中立，取消等N个按钮的提示对话框，按钮个数可以根据需要进行改变。2.带列表的列表对话框3.带多个单选列表项和N个按钮的列表对话框；4.带多个多选列表项和N个按钮的列表对话框；
示例如下：
main.xml代码如下：
<LinearLayout 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:orientation="vertical" 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" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="带3个按钮的对话框"/> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="带列表的对话框"/> <Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="带单选列表项的对话框"/> <Button android:id="@+id/button4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="带3多选列表项的对话框"/> </LinearLayout>
MainActivity.java代码如下：
package com.example.alertdialogtest;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.DialogInterface;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {private Button button1=null;private Button button2=null;private Button button3=null;private Button button4=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button1=(Button)findViewById(R.id.button1);button1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubAlertDialog alert=new AlertDialog.Builder(MainActivity.this).create();alert.setIcon(R.drawable.ic_launcher);alert.setTitle("系统提示：");alert.setMessage("带三个按钮的对话框");//设置取消按钮alert.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this, "您点击了取消按钮", Toast.LENGTH_SHORT).show();}});//设置确定按钮alert.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this, "您点击了确定按钮", Toast.LENGTH_SHORT).show();}});//设置中立按钮alert.setButton(DialogInterface.BUTTON_NEUTRAL, "中立", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this, "您点击了中立按钮", Toast.LENGTH_SHORT).show();}});alert.show();}});//为第二个按钮添加监听器button2=(Button)findViewById(R.id.button2);button2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {final String[]items=new String[]{"跑步","羽毛球","乒乓球","网球","体操"};Builder builder=new AlertDialog.Builder(MainActivity.this);builder.setIcon(R.drawable.ic_launcher);builder.setTitle("请选择你喜欢的运动项目");//添加列表项builder.setItems(items, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this, "您选择了"+items[which], Toast.LENGTH_SHORT).show();}});builder.create().show(); //显示对话框}});button3=(Button)findViewById(R.id.button3);button3.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {final String[]itmes=new String[]{"标准","无声","会议","户外","离线"};Builder builder=new AlertDialog.Builder(MainActivity.this);builder.setIcon(R.drawable.ic_launcher);builder.setTitle("请选择情景模式:");builder.setSingleChoiceItems(itmes, 0, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubToast.makeText(MainActivity.this, "您选择了"+itmes[which], Toast.LENGTH_SHORT).show();}});builder.setPositiveButton("确定", null); //添加确定按钮builder.create().show();}});button4=(Button)findViewById(R.id.button4);button4.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubfinal boolean []checkedItems=new boolean[]{false,true,false,true,false};final String []items=new String[]{"植物大战僵尸","愤怒的小鸟","泡泡龙","开心农场","超级玛丽"};Builder builder=new AlertDialog.Builder(MainActivity.this);builder.setIcon(R.drawable.ic_launcher);builder.setTitle("请选择您喜爱的游戏");builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which, boolean isChecked) {// TODO Auto-generated method stubcheckedItems[which]=isChecked;}});//为对话框添加确定按钮builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubString result="";//用于保存选择结果for(int i=0;i<checkedItems.length;i++){if(checkedItems[i]){result+=items[i]+"、";}}if(!"".equals(result)){result=result.substring(0, result.length()-1);Toast.makeText(MainActivity.this, "您选择了["+result+"]", Toast.LENGTH_SHORT).show();}}});builder.create().show();}});}@Overridepublic 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;}}
