在实际开发种LayoutInflater这个类还是非常有用的,它的作用类似于 findViewById(),

不同点是LayoutInflater是用来找layout下xml布局文件，并且实例化！而findViewById()是找具体xml下的具体 widget控件.

为了让大家容易理解我[转]做了一个简单的Demo,主布局main.xml里有一个TextView和一个Button，当点击Button，出现 Dialog,而这个Dialog的布局方式是我们在layout目录下定义的custom_dialog.xml文件(里面左右分布，左边 ImageView,右边TextView)。

代码如下:

package com.bivin;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

private Button button;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

button = (Button) findViewById(R.id.button);

button.setOnClickListener(this);

}

@Override

public void onClick(View v) {

showCustomDialog();

}

public void showCustomDialog() {

AlertDialog.Builder builder;

AlertDialog alertDialog;

Context mContext = MainActivity.this;

LayoutInflater inflater = (LayoutInflater) mContext

.getSystemService(LAYOUT_INFLATER_SERVICE);

View layout = inflater.inflate(R.layout.custom_dialog, null);

TextView text = (TextView) layout.findViewById(R.id.text);

text.setText("Hello, Welcome to Mr Wei‘s blog!");

ImageView image = (ImageView) layout.findViewById(R.id.image);

image.setImageResource(R.drawable.icon);

builder = new AlertDialog.Builder(mContext);

builder.setView(layout);

alertDialog = builder.create();

alertDialog.show();

}

}

TabSpec与TabHost

TabHost相当于浏览器中浏览器分布的集合，而Tabspec则相当于浏览器中的每一个分页面。d在Android中，每一个TabSpec分布可以是一个组件，也可以是一个布局，然后将每一个分页装入TabHost中，TabHost即可将其中的每一个分页一并显示出来

Android 中的Tabhost控件是个挺好用的控件，像一些分模块展示的页面就可以用Tabhost。

Tabhost的主要是由TabSpac组成的选项卡集合。TabSpec主要有两个重要方法，看代码：

    /**
     * A tab has a tab indicator, content, and a tag that is used to keep
     * track of it.  This builder helps choose among these options.
     *
     * For the tab indicator, your choices are:
     * 1) set a label
     * 2) set a label and an icon
     *
     * For the tab content, your choices are:
     * 1) the id of a {@link View}
     * 2) a {@link TabContentFactory} that creates the {@link View} content.
     * 3) an {@link Intent} that launches an {@link android.app.Activity}.
     */
    public class TabSpec {

        private String mTag;

        private IndicatorStrategy mIndicatorStrategy;
        private ContentStrategy mContentStrategy;

        private TabSpec(String tag) {
            mTag = tag;
        }

        /**
         * Specify a label as the tab indicator.
         */
        public TabSpec setIndicator(CharSequence label) {
            mIndicatorStrategy = new LabelIndicatorStrategy(label);
            return this;
        }

        /**
         * Specify a label and icon as the tab indicator.
         */
        public TabSpec setIndicator(CharSequence label, Drawable icon) {
            mIndicatorStrategy = new LabelAndIconIndicatorStrategy(label, icon);
            return this;
        }

        /**
         * Specify a view as the tab indicator.
         */
        public TabSpec setIndicator(View view) {
            mIndicatorStrategy = new ViewIndicatorStrategy(view);
            return this;
        }

        /**
         * Specify the id of the view that should be used as the content
         * of the tab.
         */
        public TabSpec setContent(int viewId) {
            mContentStrategy = new ViewIdContentStrategy(viewId);
            return this;
        }

        /**
         * Specify a {@link android.widget.TabHost.TabContentFactory} to use to
         * create the content of the tab.
         */
        public TabSpec setContent(TabContentFactory contentFactory) {
            mContentStrategy = new FactoryContentStrategy(mTag, contentFactory);
            return this;
        }

        /**
         * Specify an intent to use to launch an activity as the tab content.
         */
        public TabSpec setContent(Intent intent) {
            mContentStrategy = new IntentContentStrategy(mTag, intent);
            return this;
        }

setIndicator（）可以设置选项卡得图标和文字。

需要注意几点是： 1、如果你的Tabhost是从xml文件中findViewById()得到的，

TabWidget 必须为 android:id="@android:id/tabs" ，

FrameLayout android:id="@android:id/tabcontent" ；

<TabHost android:id="@+id/tabhost_info" android:layout_width="fill_parent"
	android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

	<LinearLayout android:id="@+id/linearLayout"
		android:layout_width="fill_parent" android:layout_height="fill_parent"
		android:orientation="vertical">
		<TabWidget android:id="@android:id/tabs"
			android:layout_width="fill_parent" android:layout_height="wrap_content">
		</TabWidget>
		<FrameLayout android:id="@android:id/tabcontent"
			android:layout_width="fill_parent" android:layout_height="wrap_content"
			android:layout_gravity="fill">
			<include android:id="@+id/info_include01" layout="@layout/info_layout01" />
			<include android:id="@+id/info_include02" layout="@layout/info_layout02" />
			<include android:id="@+id/info_include03" layout="@layout/info_layout03" />

		</FrameLayout>
	</LinearLayout>

</TabHost>

2、代码中，在添加TabWidget前，需要调用setup()方法。

         tabHost=(TabHost)findViewById(R.id.tabhost_info);
    	tabHost.setup(); 
    	tabHost.addTab(tabHost.newTabSpec("信息")
    	             .setContent(R.id.info_include01)
    	             .setIndicator("基本信息",getResources().getDrawable(R.drawable.ic_launcher))
    	            		
    	);
    	tabHost.addTab(tabHost.newTabSpec("更多信息")
	             .setContent(R.id.info_include02)
	             .setIndicator("更多信息",getResources().getDrawable(R.drawable.ic_launcher))
	            		
	);
    	tabHost.addTab(tabHost.newTabSpec("附件下载")
	             .setContent(R.id.info_include03)
	             .setIndicator("附件下载",getResources().getDrawable(R.drawable.ic_launcher))
	            		
	);

下面是自己写的一个demo：

Demo下载地址 ：http://download.csdn.net/detail/china1988s/4072957