Android选项卡的几种实现方法

最近在解决TabActivity过期的问题时，发现Android中选项卡有几种实现方法：继承TabActivity，继承ActivityGroup，直接继承Activity和继承FragmentActivity。其中TabActivity在API 13（Android 3.2）被标记为过期，ActivityGroup在API 14（Android 4.0）被标记为过期，目前google推荐使用的是Fragment，也就是继承FragmentActivity。虽然TabActivity和ActivityGroup被标记为过期，已经不推荐使用，但在要求不是很高的时候用起来还是比使用Fragment要方便。

使用TabActivity实现选项卡可以不需要定义布局文件，实现案例如下：

[java]

package yuchu.appmanager;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Window;
import android.widget.TabHost;

@SuppressWarnings("deprecation")
public class MainTabActivity extends TabActivity {

    private Intent mAIntent;
    private Intent mBIntent;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);

        this.mAIntent = new Intent(this, ShowAppGrid.class);
        this.mBIntent = new Intent(this, ShowRunApps.class);

        TabHost tabhost = getTabHost();

        tabhost.addTab(tabhost.newTabSpec("tab1").setIndicator("所有资源").setContent(this.mAIntent));
        tabhost.addTab(tabhost.newTabSpec("tab2").setIndicator("正在运行").setContent(this.mBIntent));
    }
}
package yuchu.appmanager;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Window;
import android.widget.TabHost;
@SuppressWarnings("deprecation")
public class MainTabActivity extends TabActivity {
private Intent mAIntent;
private Intent mBIntent;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.mAIntent = new Intent(this, ShowAppGrid.class);
this.mBIntent = new Intent(this, ShowRunApps.class);
TabHost tabhost = getTabHost();
tabhost.addTab(tabhost.newTabSpec("tab1").setIndicator("所有资源").setContent(this.mAIntent));
tabhost.addTab(tabhost.newTabSpec("tab2").setIndicator("正在运行").setContent(this.mBIntent));
}
}

使用ActivityGroup实现选项卡也相当方便，布局文件如下：

[html]

<?xml version="1.0" encoding="utf-8"?>
<TabHostxmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">
        </FrameLayout>
    </LinearLayout>
</TabHost>
<?xml version="1.0" encoding="utf-8"?>
<TabHostxmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">
        </FrameLayout>
    </LinearLayout>

</TabHost> 代码如下：

[java]

package yuchu.appmanager;

import android.app.ActivityGroup;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Window;
import android.widget.TabHost;

@SuppressWarnings("deprecation")
public class MainTabActivity extends ActivityGroup {
    private TabHost tabHost;
    private Intent mAIntent;
    private Intent mBIntent;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.maintabs);

        this.mAIntent = new Intent(this, ShowAppGrid.class);
        this.mBIntent = new Intent(this, ShowRunApps.class);
        tabHost=(TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();
        tabHost.setup(this.getLocalActivityManager());
        LayoutInflater inflater = LayoutInflater.from(this);
        inflater.inflate(R.layout.showgrid, tabHost.getTabContentView());
        inflater.inflate(R.layout.showrunning, tabHost.getTabContentView());

        tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("所有资源").setContent(this.mAIntent));
        tabHost.addTab(tabHost.newTabSpec("tab2").setIndicator("正在运行").setContent(this.mBIntent));
    }
}
package yuchu.appmanager;
import android.app.ActivityGroup;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Window;
import android.widget.TabHost;
@SuppressWarnings("deprecation")
public class MainTabActivity extends ActivityGroup {
private TabHost tabHost;
private Intent mAIntent;
private Intent mBIntent;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.maintabs);

        this.mAIntent = new Intent(this, ShowAppGrid.class);
this.mBIntent = new Intent(this, ShowRunApps.class);
        tabHost=(TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();
        tabHost.setup(this.getLocalActivityManager());
        LayoutInflater inflater = LayoutInflater.from(this);
        inflater.inflate(R.layout.showgrid, tabHost.getTabContentView());
        inflater.inflate(R.layout.showrunning, tabHost.getTabContentView());

        tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("所有资源").setContent(this.mAIntent));
tabHost.addTab(tabHost.newTabSpec("tab2").setIndicator("正在运行").setContent(this.mBIntent));
    }
}