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]
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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 private Intent public void onCreate(Bundle super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); this.mAIntentnew Intent(this,class); this.mBIntentnew Intent(this,class); TabHost 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 TabActivityprivate Intentprivate Intentpublic void onCreate(Bundlesuper.onCreate(savedInstanceState);this.requestWindowFeature(Window.FEATURE_NO_TITLE);this.mAIntentnew Intent(this,class);this.mBIntentnew Intent(this,class);TabHosttabhost.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：
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<?xml version="1.0" encoding="utf-8"?> 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"?> 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]
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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 private Intent private Intent @Override public void onCreate(Bundle super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.maintabs); this.mAIntentnew Intent(this,class); this.mBIntentnew Intent(this,class); tabHost=(TabHost)findViewById(android.R.id.tabhost); tabHost.setup(); tabHost.setup(this.getLocalActivityManager()); LayoutInflaterthis); inflater.inflate(R.layout.showgrid, inflater.inflate(R.layout.showrunning, 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 ActivityGroupprivate TabHostprivate Intentprivate Intent @Override public void onCreate(Bundle super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.maintabs); this.mAIntentnew Intent(this,class);this.mBIntentnew Intent(this,class); tabHost=(TabHost)findViewById(android.R.id.tabhost); tabHost.setup(); tabHost.setup(this.getLocalActivityManager()); LayoutInflaterthis); inflater.inflate(R.layout.showgrid, inflater.inflate(R.layout.showrunning, 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)); }} |