今天我们学习的内容是实现两种对话框(Dialog)，第一种是询问是否退出对话框，另外一种是带图标的列表对话框，程序的执行效果是，我们点击button1的时候，弹出第一种对话框，我们点击button2的时候，弹出另外一种对话框。
(1) 首先是布局方面，有三个xml文件，一个是Activity的布局文件，一个是Dialog的布局文件，一个是ListView的布局文件，内容分别例如以下：
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"> <Button android:id="@+id/exit_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="对话框1"/> <Button android:id="@+id/list_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="对话框2"/> </LinearLayout>
dialog_list.xml
<?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" > <ListView
android:id="@+id/listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:cacheColorHint="#00000000" >
</ListView> </LinearLayout>
items.xml
<?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="horizontal" > <ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:maxHeight="72px"
android:maxWidth="72px"
android:paddingBottom="20px"
android:paddingLeft="10px"
android:paddingTop="20px" /> <TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="10px" /> </LinearLayout>
(2)然后就Java代码部分，代码部分关于dialog我已经具体凝视，具体请看：
package com.example.dialogdemo; import java.util.ArrayList;
import java.util.HashMap; import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView; public class MainActivity extends Activity { //定义两个静态字符串
private static final String DIALOG_ICON = "icon";
private static final String DIALOG_TITLE = "title"; //声明Button类型的变量button1
private Button button1; //声明Button类型的变量button2
private Button button2; //声明View类型的变量view
private View view; //声明ListView类型的变量listView
private ListView listView; //声明一个ArrayList变量mList，它里面的item都是HashMap类型
private ArrayList<HashMap<String, Object>> mList; @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); initData();
setupViews();
} /**
* 初始化数据
*/
private void initData(){
//初始化mList
if(mList == null){
mList = new ArrayList<HashMap<String,Object>>();
}else{
mList.clear();
} //向mList里面加入数据
HashMap<String, Object> map = new HashMap<String, Object>();
map.put(DIALOG_ICON, R.drawable.img01);
map.put(DIALOG_TITLE, "程序管理");
mList.add(map); map = new HashMap<String, Object>();
map.put(DIALOG_ICON, R.drawable.img02);
map.put(DIALOG_TITLE, "保密设置");
mList.add(map); map = new HashMap<String, Object>();
map.put(DIALOG_ICON, R.drawable.img03);
map.put(DIALOG_TITLE, "安全设置");
mList.add(map); map = new HashMap<String, Object>();
map.put(DIALOG_ICON, R.drawable.img04);
map.put(DIALOG_TITLE, "邮件设置");
mList.add(map); map = new HashMap<String, Object>();
map.put(DIALOG_ICON, R.drawable.img05);
map.put(DIALOG_TITLE, "铃声设置");
mList.add(map);
} /**
* 初始化视图
*/
private void setupViews(){
LayoutInflater inflater = LayoutInflater.from(MainActivity.this); view = inflater.inflate(R.layout.dialog_list, null);
listView = (ListView) view.findViewById(R.id.listview); DialogListViewAdapter adapter = new DialogListViewAdapter(); listView.setAdapter(adapter); //通过findviewbyid()获取Button对象
button1 = (Button) findViewById(R.id.exit_button);
button2 = (Button) findViewById(R.id.list_button); //为button1设置点击监听器
button1.setOnClickListener(new OnClickListener() { @Override
public void onClick(View v) {
//初始化一个AlertDialog对象
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); //为dialog设置图标
alertDialog.setIcon(getResources().getDrawable(R.drawable.advise)); //为dialog设置标题
alertDialog.setTitle("退出？"); //为dialog设置主体内容
alertDialog.setMessage("是否真的要退出当前应用？"); //为dialog设置一个按钮
alertDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "不退出", new DialogInterface.OnClickListener() { @Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub }
}); //为dialog设置还有一个按钮
alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "是的", new DialogInterface.OnClickListener() { @Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
MainActivity.this.finish();
}
}); //显示dialog
alertDialog.show();
}
}); //为button2设置点击监听器
button2.setOnClickListener(new OnClickListener() { @Override
public void onClick(View v) {
//初始化一个AlertDialog
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); //为alertDialog设置视图
alertDialog.setView(view); //显示alertDialog
alertDialog.show();
}
});
} /**
* 定义ListView的Adapter，其作用是为ListView视图提供数据
*/
class DialogListViewAdapter extends BaseAdapter{ @Override
public int getCount() {
return mList.size();
} @Override
public Object getItem(int position) {
return mList.get(position);
} @Override
public long getItemId(int position) {
return position;
} @Override
public View getView(int position, View convertView, ViewGroup parent) {
ListViewItemHolder holder; if(convertView == null){
convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.items, null);
holder = new ListViewItemHolder();
holder.imageView = (ImageView) convertView.findViewById(R.id.image);
holder.textView = (TextView) convertView.findViewById(R.id.title); convertView.setTag(holder);
}else{
holder = (ListViewItemHolder) convertView.getTag();
} HashMap<String, Object> map = mList.get(position);
int iconId = (Integer) map.get(DIALOG_ICON);
String title = (String) map.get(DIALOG_TITLE);
holder.imageView.setImageResource(iconId);
holder.textView.setText(title); return convertView;
} } //两个视图控件的一个封装类
class ListViewItemHolder{
ImageView imageView;
TextView textView;
} @Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
(3)执行一下android project，效果图例如以下：
最后附上源代码下载地址：