Android学习之对话框（复选按钮）

MyDialogDemo.java:

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MyDialogDemo extends Activity {
  private Button mybut = null ; // 定义按钮
  private TextView mych = null ;  // 定义文本
  private String fruitData [] = new String[] { "苹果", "西瓜", "水蜜桃" };
  private boolean chData[] = new boolean[] { true, true, false };
  @Override 
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.setContentView(R.layout.main); // 调用布局管理器
    this.mybut = (Button) super.findViewById(R.id.mybut) ;  // 取得按钮
    this.mych = (TextView) super.findViewById(R.id.mych) ;  // 取得文本
    this.mybut.setOnClickListener(new OnClickListenerImpl()) ;  // 设置事件类
  }
  private class OnClickListenerImpl implements OnClickListener {
 
    @Override
    public void onClick(View view) {
      Dialog dialog = new AlertDialog.Builder(MyDialogDemo.this)
        .setIcon(R.drawable.pic_m) 
        .setTitle("请选择你喜欢吃的水果？")
        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
          
          @Override
          public void onClick(DialogInterface dialog, int which) {
          }
        })
        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
            
          }
              })
          .setMultiChoiceItems(MyDialogDemo.this.fruitData,
              MyDialogDemo.this.chData,
              new DialogInterface.OnMultiChoiceClickListener() {
                @Override
                public void onClick(DialogInterface dialog,
                    int which, boolean isChecked) {
                  for (int x = 0; x < MyDialogDemo.this.fruitData.length; x++) {
                    if(x == which && isChecked) { // 当前选项被选中
                      MyDialogDemo.this.mych
                          .append(MyDialogDemo.this.fruitData[x]
                              + "、");
                    }
                  }
                }
              }).create();
      dialog.show() ;
    }
    
  }

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <TextView
    android:id="@+id/mych"
    android:text="" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
  <Button 
    android:id="@+id/mybut"
    android:text="选择水果"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"/>
</LinearLayout>

 friut_data.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string-array name="fruit_labels">
    <item>苹果</item>
    <item>西瓜</item>
    <item>水蜜桃</item>
  </string-array>
</resources>