Android入门第九篇之AlertDialog

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！

       时隔一年，又要准备做Android的开发了，最近复习和整理一下Android的知识。这次要说的是AlertDialog，这种对话框会经常遇到。AlertDialog跟WIN32开发中的Dialog不一样，AlertDialog是非阻塞的，而阻塞的对话框用的是PopupWindow。

       先贴出程序运行的截图：

main.xml的源码：

<?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"  
    >  
  
<Button android:id="@+id/Button01" android:layout_height="wrap_content" android:text="非Layout型对话框" android:layout_width="fill_parent"></Button>  
<Button android:id="@+id/Button02" android:layout_height="wrap_content" android:text="Layout型对话框" android:layout_width="fill_parent"></Button><View android:id="@+id/View01" android:layout_width="wrap_content" android:layout_height="wrap_content"></View>  
  
</LinearLayout>

下图是非Layout型对话框，直接使用AlertDialog

下图是使用了Layout的对话框，可以自定义控件，实现更复杂的对话框

dialoglayout.xml的源码：

<?xml version="1.0" encoding="utf-8"?>  
  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent" android:layout_height="wrap_content"  
    android:orientation="vertical">  
    <EditText android:layout_height="wrap_content"  
        android:layout_width="fill_parent" android:layout_marginLeft="20dip"  
        android:layout_marginRight="20dip" android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/edtInput"/>  
</LinearLayout>

程序源码：

package com.testAlertDialog;  
  
import android.app.Activity;  
import android.app.AlertDialog;  
import android.content.Context;  
import android.content.DialogInterface;  
import android.os.Bundle;  
import android.view.Gravity;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.EditText;  
import android.widget.PopupWindow;  
  
  
public class testAlertDialog extends Activity {  
    Button btnShowDialog;  
    Button btnShowDialog_Layout;  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        //定义按钮   
        btnShowDialog=(Button)this.findViewById(R.id.Button01);  
        btnShowDialog.setOnClickListener(new ClickEvent());  
        btnShowDialog_Layout=(Button)this.findViewById(R.id.Button02);  
        btnShowDialog_Layout.setOnClickListener(new ClickEvent());  
    }  
      
      
    //统一处理按键事件   
    class ClickEvent implements OnClickListener{  
  
        @Override  
        public void onClick(View v) {  
            // TODO Auto-generated method stub   
            if(v==btnShowDialog)  
                showDialog(testAlertDialog.this);  
                  
            else if(v==btnShowDialog_Layout)  
                showDialog_Layout(testAlertDialog.this);  
              
        }  
  
    }  
  
    //显示基本的AlertDialog   
    private void showDialog(Context context) {  
        AlertDialog.Builder builder = new AlertDialog.Builder(context);  
        builder.setIcon(R.drawable.icon);  
        builder.setTitle("Title");  
        builder.setMessage("Message");  
        builder.setPositiveButton("Button1",  
                new DialogInterface.OnClickListener() {  
                    public void onClick(DialogInterface dialog, int whichButton) {  
                        setTitle("点击了对话框上的Button1");  
                    }  
                });  
        builder.setNeutralButton("Button2",  
                new DialogInterface.OnClickListener() {  
                    public void onClick(DialogInterface dialog, int whichButton) {  
                        setTitle("点击了对话框上的Button2");  
                    }  
                });  
        builder.setNegativeButton("Button3",  
                new DialogInterface.OnClickListener() {  
                    public void onClick(DialogInterface dialog, int whichButton) {  
                        setTitle("点击了对话框上的Button3");  
                    }  
                });  
        builder.show();  
    }  
  
  
    //显示基于Layout的AlertDialog   
    private void showDialog_Layout(Context context) {  
        LayoutInflater inflater = LayoutInflater.from(this);  
        final View textEntryView = inflater.inflate(  
                R.layout.dialoglayout, null);  
        final EditText edtInput=(EditText)textEntryView.findViewById(R.id.edtInput);  
        final AlertDialog.Builder builder = new AlertDialog.Builder(context);  
        builder.setCancelable(false);  
        builder.setIcon(R.drawable.icon);  
        builder.setTitle("Title");  
        builder.setView(textEntryView);  
        builder.setPositiveButton("确认",  
                new DialogInterface.OnClickListener() {  
                    public void onClick(DialogInterface dialog, int whichButton) {  
                        setTitle(edtInput.getText());  
                    }  
                });  
        builder.setNegativeButton("取消",  
                new DialogInterface.OnClickListener() {  
                    public void onClick(DialogInterface dialog, int whichButton) {  
                        setTitle("");  
                    }  
                });  
        builder.show();  
    }  
}