Android之Tab分页标签的实现方法一-----TabActivity和TabHost的结合（三）

讲了两种方式，你是否发觉它们的代码耦合性太高，如果代码过多，那就是密密麻麻的一大堆，不仅可读性差，修改维护还很困难。这里讲到的方式三，能够很好的解决这个紧耦合问题。因为它的布局文件和各块代码都是独立的文件。那步入主题吧。

三、TabActivity和TabHost的结合（三）

实现描述：

1.主类继承TabActivity

public class Tagpage extends TabActivity

2.获取当前TabHost对象

final TabHost tabHost = getTabHost();

3.添加Tab分页标签,这里就是关键，把每个分页面链接成Activity。页面的跳转，即是Activity的跳转。

tabHost.addTab(tabHost.newTabSpec("Tab1")

.setIndicator("tab2", getResources().getDrawable(R.drawable.a1))

.setContent(new Intent(this, Page1.class)));

.............









1、布局文件

page1.xml

[xhtml] view
plaincopy

<?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"

>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="This is Tab1"

/>

</LinearLayout>

page3.xml

[xhtml] view
plaincopy

<?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"

>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="This is Tab3"

/>

</LinearLayout>

page2.xml

[xhtml] view
plaincopy

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

android:id="@+id/widget30"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

>

<EditText

android:id="@+id/et_text"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="EditText"

android:textSize="18sp"

>

</EditText>

<Button

android:id="@+id/bt_show"

android:layout_width="149px"

android:layout_height="wrap_content"

android:text="显示"

>

</Button>

</LinearLayout>

2、代码

主代码：Tagpage.java

[c-sharp] view
plaincopy

package com.myandroid.test;

import android.app.Activity;

import android.app.TabActivity;

import android.content.Intent;

import android.os.Bundle;

import android.widget.TabHost;

public class Tagpage extends TabActivity{

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//setContentView(R.layout.main);

final TabHost tabHost = getTabHost();

tabHost.addTab(tabHost.newTabSpec("Tab1")

.setIndicator("tab2", getResources().getDrawable(R.drawable.a1))

.setContent(new Intent(this, Page1.class)));

tabHost.addTab(tabHost.newTabSpec("Tab2")

.setIndicator("tab2", getResources().getDrawable(R.drawable.a2))

.setContent(new Intent(this, Page2.class)));

// .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))); //添加这句话，会使得每次跳转到该页面都是新建一个页面，以往的数据状态会丢失，读者自己可以试验下

tabHost.addTab(tabHost.newTabSpec("Tab3")

.setIndicator("tab2", getResources().getDrawable(R.drawable.a3))

.setContent(new Intent(this, Page3.class)));

}

}

分页一Activity：Page1.java

[java] view
plaincopy

package com.myandroid.test;

import android.app.Activity;

import android.os.Bundle;

public class Page1 extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.page1);

}

}

分页三Activity：Page3.java

[java] view
plaincopy

package com.myandroid.test;

import android.app.Activity;

import android.os.Bundle;

public class Page3 extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.page3);

}

}

分页二Activity:Page2.java

[java] view
plaincopy

package com.myandroid.test;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class Page2 extends Activity {

private Button bt_show;

private EditText et_text;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.page2);

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

et_text = (EditText)findViewById(R.id.et_text);

bt_show.setOnClickListener(new ClickEvent());

}

class ClickEvent implements OnClickListener{

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Toast.makeText(Page2.this, et_text.getText(), Toast.LENGTH_SHORT).show();

}

}

}

最后，别忘了在AndroidManifest.xml文件注册上面用到三个子页面Activity，如下：

[xhtml] view
plaincopy

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.myandroid.test"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/app_name">

..................

<!-- 要添加Activity的声明，否则系统找不到响应的Activity，会报错 -->

<activity android:name="Page1"></activity>

<activity android:name="Page2"></activity>

<activity android:name="Page3"></activity>

</application>

</manifest>

介绍完了TabActivity和TabHost的结合分页，下一篇将介绍ActivityGroup + GridView结合实现Tap分页。