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();
	}
}