TabHost 简单使用方法

package com.google.tabhost;
 
 import android.app.TabActivity;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.widget.TabHost;
 
 public class HelloTabHost extends TabActivity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 
 //调用TabActivity的getTabHost()方法获取TabHost对象
 TabHost tabHost = getTabHost();
 
 //设置使用TabHost布局
 LayoutInflater.from(this).inflate(R.layout.main, tabHost.getTabContentView(),true);
 
 //添加第一个标签页
 tabHost.addTab(tabHost.newTabSpec("tab01").setIndicator("已接电话").setContent(R.id.tab01));
 
 //添加第二个标签页,并在其标签上添加一个图片
 tabHost.addTab(tabHost.newTabSpec("tab02").setIndicator("未接电话",getResources().getDrawable(R.drawable.icon)).setContent(R.id.tab02));
 
 //添加第三个标签页
 tabHost.addTab(tabHost.newTabSpec("tab03").setIndicator("已拨电话").setContent(R.id.tab03));
 
 }
 }

LayoutInflater作用及使用

作用： 
1、对于一个没有被载入或者想要动态载入的界面, 都需要使用inflate来载入. 

2、对于一个已经载入的Activity, 就可以使用实现了这个Activiyt的的findViewById方法来获得其中的界面元素. 

方法： 
   Android里面想要创建一个画面的时候, 初学一般都是新建一个类, 继承Activity基类, 然后在onCreate里面使用setContentView方法来载入一个在xml里定义好的界面. 

   其实在Activity里面就使用了LayoutInflater来载入界面, 通过getSystemService(Context.LAYOUT_INFLATER_SERVICE)方法可以获得一个 LayoutInflater, 也可以通过LayoutInflater inflater = getLayoutInflater();来获得.然后使用inflate方法来载入layout的xml, 

下面是一个简单的例子:

首先我们要知道,什么是已经被载入的layout,什么是还没有载入的.我们启动一个应用,与入口Activity相关的layout{常见的是main.xml}就是被载入的,即在Oncreate()中的.而其他的layout是没有被载入的.就要动态载入了或通过另一个activity.

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;
}

    /**
     * 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))

         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

。