AlertDialog提示框的使用

AlertDialog 用于弹出提示框，本身并没有构造函，不可以通过构造函数来初始化，首先需要通过AlertDialog.Builder来创建一个Buider，然后有两种方法来完成一个AlertDialog：一种方法是使用Builder对象中的方法定义AlertDialog的属性，然后再使用show（）方法来创建并显示AlertDialog提示框；另一种方法是先使用create方法获得AlertDialog对象，然后使用AlertDialog对象的方法定义AlertDialog属性，最后使用show（）方法显示AlertDialog提示框。

      AlertDialog.builder构造函数有两种：

1.AlertDialog.builder(Content content)；

2.AlertDialog.builder(Content content，int theme)

    AlertDialog的主要方法及用途介绍如下。

1.void dismiss()：将对话框从屏幕中移除

2.void setButton（int whichButton,CharSequece text, DialogInterface.OnClickListener）：设置对话框的按钮

3.void setView(View view )：将视图控件显示在对话框中

4.void setMessage(CharSequence message)：设置对话框的显示内容

5.setTitle(CharSequence title)：为对话框设置标题

6.void setIcon(Drawable icon)和void seticon(int resId)：为对话框设置图标

7.AlertDialog.Builder setMultiChoiceItems(items, checkedItems, listener)：在对话框中显示多选框

8.AlertDialog.Builder setSingleChoiceItems(CharSequence[] items,int checkedItem,DialogInterface.OnclickListener)：在对话框中显示单选框

9.AlertDialog.Builder setItems(CharSequence[]items,Dialoginterface.OnClickListener listener)：在对话框中显示列表

下面是利用AlertDialog创建的7种不同风格的对话框，希望对初学android的朋友起到一定的帮助作用：

（1）布局文件main.xml如下

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView         android:id="@+id/textvie1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Textview"/>    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="两个按钮"/>    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="三个按钮"/>    <Button        android:id="@+id/button3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="显示视图"/>    <Button        android:id="@+id/button4"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="多选列表"/>    <Button        android:id="@+id/button5"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="单选列表"/>    <Button        android:id="@+id/button6"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="列表数据"/>    <Button        android:id="@+id/button7"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="自定义视图"/></LinearLayout>

（2）程序代码如下

package com.example.alertdialog;import com.example.alertdialog.R.layout;import android.R.anim;import android.R.raw;import android.app.Activity;import android.app.ActionBar;import android.app.AlertDialog;import android.app.Fragment;import android.content.DialogInterface;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.os.Build;public class AlertDialogDemo extends Activity {private AlertDialog dialog;private AlertDialog.Builder builder;private TextView tView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);tView=(TextView)this.findViewById(R.id.textvie1);Button button1=(Button)this.findViewById(R.id.button1);Button button2=(Button)this.findViewById(R.id.button2);Button button3=(Button)this.findViewById(R.id.button3);Button button4=(Button)this.findViewById(R.id.button4);Button button5=(Button)this.findViewById(R.id.button5);Button button6=(Button)this.findViewById(R.id.button6);Button button7=(Button)this.findViewById(R.id.button7);View.OnClickListener listener=new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.button1:dialog1();break;case R.id.button2:dialog2();break;case R.id.button3:dialog3();break;case R.id.button4:dialog4();break;case R.id.button5:dialog5();break;case R.id.button6:dialog6();break;case R.id.button7:dialog7();break;}}};button1.setOnClickListener(listener);button2.setOnClickListener(listener);button3.setOnClickListener(listener);button4.setOnClickListener(listener);button5.setOnClickListener(listener);button6.setOnClickListener(listener);button7.setOnClickListener(listener);}public void dialog1(){dialog=new AlertDialog.Builder(this).create();dialog.setTitle("提示");dialog.setMessage("确定退出吗？");dialog.setIcon(android.R.drawable.ic_dialog_alert);//创建监听器DialogInterface.OnClickListener listener=new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubif (which==DialogInterface.BUTTON_POSITIVE) {//按下确定dialog.dismiss();AlertDialogDemo.this.finish();} else if(which==DialogInterface.BUTTON_NEGATIVE){//按下取消dialog.dismiss();}}};dialog.setButton(DialogInterface.BUTTON_POSITIVE, "确定", listener);dialog.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", listener);dialog.show();}public void dialog2(){dialog=new AlertDialog.Builder(this).create();dialog.setTitle("调查");dialog.setMessage("你平时忙吗？");dialog.setIcon(android.R.drawable.ic_dialog_info);//设置对话框的图标为ic_dialog_alert//创建按键监听器DialogInterface.OnClickListener listener=new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubString str="";switch (which) {case DialogInterface.BUTTON_POSITIVE:str="平时很忙";break;case DialogInterface.BUTTON_NEUTRAL:str="平时一般";break;case DialogInterface.BUTTON_NEGATIVE:str="平时轻松";break;}tView.setText(str);}};dialog.setButton(DialogInterface.BUTTON_POSITIVE, "忙碌", listener);dialog.setButton(DialogInterface.BUTTON_NEUTRAL, "一般", listener);dialog.setButton(DialogInterface.BUTTON_NEGATIVE, "不忙", listener);dialog.show();}public void dialog3(){dialog=new AlertDialog.Builder(this).create();dialog.setTitle("请输入");dialog.setMessage("你平时忙吗？");dialog.setIcon(android.R.drawable.ic_dialog_info);final EditText tEdit=new EditText(this);dialog.setView(tEdit);//创建按键监听器DialogInterface.OnClickListener listener=new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubtView.setText("输入的是："+tEdit.getText().toString());//将输入的内容转化为字符串}};dialog.setButton(DialogInterface.BUTTON_POSITIVE, "确定", listener);dialog.show();}public void dialog4(){final String item[]=new String[]{"北京","上海","广州"};final boolean bSelect[]=new boolean[item.length];//创建按键监听器DialogInterface.OnMultiChoiceClickListener mListener=new DialogInterface.OnMultiChoiceClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which, boolean isChecked) {// 用一个数组记录下选择的所有选项bSelect[which]=isChecked;}};builder=new AlertDialog.Builder(this);builder.setMultiChoiceItems(item, null, mListener);dialog=builder.create();dialog.setTitle("复选框");DialogInterface.OnClickListener listener =new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubString str="你选择了：";for (int i = 0; i < bSelect.length; i++) {if( bSelect[i]){str=str+"\n"+item[i];}}tView.setText(str);}};dialog.setButton(DialogInterface.BUTTON_POSITIVE,"确定", listener);dialog.show();}public void dialog5(){final String item[]=new String[]{"北京","上海","广州"};final boolean bSelect[]=new boolean[item.length];//创建按键监听器DialogInterface.OnClickListener sListener=new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 用一个数组记录下选择的所有选项bSelect[which]=true;}};builder=new AlertDialog.Builder(this);builder.setSingleChoiceItems(item, -1, sListener);//在对话框中显示单选框，checkedItem=-1表示没有被选中的dialog=builder.create();dialog.setTitle("单选框");DialogInterface.OnClickListener listener =new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubString str="你选择了：";for (int i = 0; i < bSelect.length; i++) {if( bSelect[i]){str=str+"\n"+item[i];}}tView.setText(str);}};dialog.setButton(DialogInterface.BUTTON_POSITIVE,"确定", listener);dialog.show();}public void dialog6(){final String item[]=new String[]{"北京","上海","广州"};final boolean bSelect[]=new boolean[item.length];//创建按键监听器DialogInterface.OnClickListener sListener=new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 用一个数组记录下选择的所有选项String str="你选择了："+item[which];tView.setText(str);}};builder=new AlertDialog.Builder(this);builder.setItems(item,sListener);dialog=builder.create();dialog.setTitle("列表框");DialogInterface.OnClickListener listener =new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubdialog.dismiss();}};dialog.setButton(DialogInterface.BUTTON_POSITIVE,"取消", listener);dialog.show();}public void dialog7(){LayoutInflater inflater=getLayoutInflater();View Layout=inflater.inflate(R.layout.dialog, null);final EditText tEdit=(EditText)latout.findViewById(R.id.editText1);dialog=new AlertDialog.Builder(this).create();dialog.setTitle("自定义布局");dialog.setView(Layout);DialogInterface.OnClickListener listener=new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubtView.setText("输入的是："+tEdit.getText().toString());}};dialog.setButton(DialogInterface.BUTTON_POSITIVE,"确定", listener);dialog.setButton(DialogInterface.BUTTON_NEGATIVE,"取消", listener);dialog.show();}}