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

<?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

view plain

<?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

view plain

<?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

view plain

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

view plain

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

view plain

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

view plain

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：

view plain

<?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