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POHow to use two tabHost on Android
 

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  1. POHow to use two tabHost on Android
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    <p>Below is my layout xml file: </p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" &gt; &lt;LinearLayout android:id="@+id/l1" android:layout_width="fill_parent" android:layout_height="match_parent" android:layout_weight="1" android:gravity="right" android:orientation="vertical" &gt; &lt;TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/ic_launcher"&gt; &lt;RelativeLayout android:id="@+id/RelativeLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:background="#FF888888"/&gt; &lt;FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentLeft="true" android:layout_above="@android:id/tabs" /&gt; &lt;/RelativeLayout&gt; &lt;/TabHost&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id="@+id/l2" android:layout_width="fill_parent" android:layout_height="match_parent" android:layout_weight="0.5" android:background="#000000" android:orientation="vertical" &gt; &lt;TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/ic_launcher"&gt; &lt;RelativeLayout android:id="@+id/RelativeLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:background="#FF888888"/&gt; &lt;FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentLeft="true" android:layout_above="@android:id/tabs" /&gt; &lt;/RelativeLayout&gt; &lt;/TabHost&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>There 2 tabhost in layout l1 and l2.<br> And below code is mine to use tabhost: </p> <pre><code>TabWidget tw; TabHost tabHost; tabHost = getTabHost(); TabHost.TabSpec spec; Intent intent; Resources res = getResources(); tw = (TabWidget)findViewById(android.R.id.tabs); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("A").setIndicator("A", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("B").setIndicator("B", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("C").setIndicator("C", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); </code></pre> <p>But it can only control the tabhost in l1.<br> How can I do to control the tabhost in l2? </p> <p>I make some modify as below: </p> <pre><code> private TabWidget tw; private TabHost tabHost; private TabWidget tw1; private TabHost tabHost1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tabHost = getTabHost(); TabHost.TabSpec spec; Intent intent; Resources res = getResources(); tw = (TabWidget)findViewById(android.R.id.tabs); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("A").setIndicator("A", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("B").setIndicator("B", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("C").setIndicator("C", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("A").setIndicator("A", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); tabHost1 = (TabHost)findViewById(R.id.tabhost1); TabHost.TabSpec spec1; Intent intent1; tw1 = (TabWidget)findViewById(android.R.id.tabs); intent1 = new Intent().setClass(this, MyGroup.class); spec1 = tabHost1.newTabSpec("D").setIndicator("D", res.getDrawable(R.drawable.ic_action_search)).setContent(intent1); tabHost1.addTab(spec1); intent1 = new Intent().setClass(this, MyGroup.class); spec1 = tabHost1.newTabSpec("E").setIndicator("E", res.getDrawable(R.drawable.ic_action_search)).setContent(intent1); tabHost1.addTab(spec1); intent1 = new Intent().setClass(this, MyGroup.class); spec1 = tabHost1.newTabSpec("F").setIndicator("F", res.getDrawable(R.drawable.ic_action_search)).setContent(intent1); tabHost1.addTab(spec1); intent1 = new Intent().setClass(this, MyGroup.class); spec1 = tabHost1.newTabSpec("G").setIndicator("G", res.getDrawable(R.drawable.ic_action_search)).setContent(intent1); tabHost1.addTab(spec1); } </code></pre> <p>And error message is below: </p> <pre><code>08-14 16:26:26.960: D/AndroidRuntime(9763): Shutting down VM 08-14 16:26:26.960: W/dalvikvm(9763): threadid=1: thread exiting with uncaught exception (group=0x40a291f8) 08-14 16:26:26.960: E/AndroidRuntime(9763): FATAL EXCEPTION: main 08-14 16:26:26.960: E/AndroidRuntime(9763): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testtwolayout/com.example.testtwolayout.MainActivity}: java.lang.NullPointerException 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.ActivityThread.access$600(ActivityThread.java:123) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.os.Handler.dispatchMessage(Handler.java:99) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.os.Looper.loop(Looper.java:137) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.ActivityThread.main(ActivityThread.java:4424) 08-14 16:26:26.960: E/AndroidRuntime(9763): at java.lang.reflect.Method.invokeNative(Native Method) 08-14 16:26:26.960: E/AndroidRuntime(9763): at java.lang.reflect.Method.invoke(Method.java:511) 08-14 16:26:26.960: E/AndroidRuntime(9763): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 08-14 16:26:26.960: E/AndroidRuntime(9763): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 08-14 16:26:26.960: E/AndroidRuntime(9763): at dalvik.system.NativeStart.main(Native Method) 08-14 16:26:26.960: E/AndroidRuntime(9763): Caused by: java.lang.NullPointerException 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.widget.TabHost.addTab(TabHost.java:232) 08-14 16:26:26.960: E/AndroidRuntime(9763): at com.example.testtwolayout.MainActivity.onCreate(MainActivity.java:68) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.Activity.performCreate(Activity.java:4465) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 08-14 16:26:26.960: E/AndroidRuntime(9763): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 08-14 16:26:26.960: E/AndroidRuntime(9763): ... 11 more </code></pre> <p>The line MainActivity.java:68 means line tabHost1.addTab(spec1);</p> <p>I have resolve by this <a href="https://stackoverflow.com/questions/3163884/android-tabhost-without-tabactivity">Android: TabHost without TabActivity</a> .<br> And simple test code as below: </p> <pre><code> private LocalActivityManager mlam; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mlam = new LocalActivityManager(this, false); mlam.dispatchCreate(savedInstanceState); tw = (TabWidget)findViewById(android.R.id.tabs); Resources res = getResources(); tabHost =(TabHost)findViewById(android.R.id.tabhost); tabHost.setup(mlam); TabHost.TabSpec spec; Intent intent; intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("A").setIndicator("A", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); intent = new Intent().setClass(this, MyGroup.class); spec = tabHost.newTabSpec("B").setIndicator("B", res.getDrawable(R.drawable.ic_action_search)).setContent(intent); tabHost.addTab(spec); tabHost1 = (TabHost)findViewById(R.id.tabhost1); tabHost1.setup(mlam); TabHost.TabSpec spec1; Intent intent1; intent1 = new Intent().setClass(this, MyGroup.class); spec1 = tabHost1.newTabSpec("C").setIndicator("C", res.getDrawable(R.drawable.ic_action_search)).setContent(intent1); tabHost1.addTab(spec1); intent1 = new Intent().setClass(this, MyGroup.class); spec1 = tabHost1.newTabSpec("D").setIndicator("D", res.getDrawable(R.drawable.ic_action_search)).setContent(intent1); tabHost1.addTab(spec1); tabHost1.setCurrentTab(0); } </code></pre> <p>And MyGroup is below: </p> <pre><code>public class MyGroup extends ActivityGroup { public static ActivityGroup group; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); group = this; } @Override public void onBackPressed() { group.getLocalActivityManager().getCurrentActivity().onBackPressed(); } @Override protected void onResume() { super.onResume(); Intent it; Window w; View view; it = new Intent(this, AActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); w = group.getLocalActivityManager().startActivity("AActivity", it); view = w.getDecorView(); group.setContentView(view); } } </code></pre> <p>And AActivity as below only show a random number: </p> <pre><code>public class AActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.a); TextView tv = (TextView)findViewById(R.id.atv); int x = (int)(Math.random()*42+1); String xx = Integer.toString(x); Log.d("q", xx); tv.setText(xx); } } </code></pre> <p>But I find the left layout's tab 0 will not show number.<br> But the line Log.d("q", xx); is show.<br> How about this? </p>
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