（轉)android中的alertdialog及LayoutInflater

http://blog.csdn.net/hellogv/archive/2010/10/21/5955959.aspx#

這個例子不錯，詳細講解了alertdialog及LayoutInflater的用法：

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"

    >

<Button android:id="@+id/Button01" android:layout_height="wrap_content" android:text="非Layout型對話方塊" android:layout_width="fill_parent"></Button>

<Button android:id="@+id/Button02" android:layout_height="wrap_content" android:text="Layout型對話方塊" android:layout_width="fill_parent"></Button><View android:id="@+id/View01" android:layout_width="wrap_content" android:layout_height="wrap_content"></View>

</LinearLayout>

dialoglayout.xml:

<?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>

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);

        //定義按鈕

        btnShowDialog=(Button)this.findViewById(R.id.Button01);

        btnShowDialog.setOnClickListener(new ClickEvent());

        btnShowDialog_Layout=(Button)this.findViewById(R.id.Button02);

        btnShowDialog_Layout.setOnClickListener(new ClickEvent());

    }

   

   

    //統一處理按鍵事件

    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);

   

    }

    }

    //顯示基本的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("點擊了對話方塊上的Button1");

}

});

builder.setNeutralButton("Button2",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

setTitle("點擊了對話方塊上的Button2");

}

});

builder.setNegativeButton("Button3",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

setTitle("點擊了對話方塊上的Button3");

}

});

builder.show();

}

    //顯示基於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("確認",

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();

}

}

小結下：

１對於button，可以學上面這樣，統一的一個事件去處理．

２　在實際開發種LayoutInflater這個類還是非常有用的,它的作用類似於 findViewById(),

不同點是LayoutInflater是用來找layout下xml布局檔案，並且執行個體化！而findViewById()是找具體xml下的具體 widget控制項(如:Button,TextView等)。

３　注意這裡AlertDialog.Builder 的用法