Question

I am self learner to android.
Right now i have five pages in an android application.The first page contains two buttons(button1,button2).If i trigger the button1 it should go to the second page,which contains one button,again if i trigger this button finally it should simply display a tab host which laying on the third page.Likewise if i trigger the button2 from the page one it should go to page four and page five as like what the button1 has done.

During at run when i am clicking the button from page four,it shown error message as
Sorry! The application Tabhost_demo has stopped unexpectedly.please try again!
(Note : Other Pages activities are working well rather than four and five).

Refer java class source

public class First_index extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

    Button btn1 = (Button) findViewById(R.id.button_parent);
    btn1.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
           Intent myIntent = new Intent(view.getContext(), Index_parent.class);
           startActivityForResult(myIntent, 0);
          }
});

This is for page switching right?

---

AND THIS SOURCE IS FOR TABHOSTING

    public class Parent_concpt extends TabActivity {  
        /** Called when the activity is first created. */  
        @Override  
        protected void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main3);  

            TabHost tabHost = getTabHost();

            // Tab for Attendance
            TabSpec pho = tabHost.newTabSpec("Attendance");
            // setting Title and Icon for the Tab
            pho.setIndicator("Attendance",getResources().getDrawable(R.drawable.icon_att_parent));
        Intent phoIntent = new Intent(this, Att_parents.class);
        pho.setContent(phoIntent);

        // Tab for Marks
        TabSpec mrk = tabHost.newTabSpec("Achievement");
        mrk.setIndicator("Achievement",     getResources().getDrawable(R.drawable.icon_achieve_parents));
        Intent mrkIntent = new Intent(this, Achieve_parents.class);
        mrk.setContent(mrkIntent);

        // Tab for Fee
        TabSpec fees = tabHost.newTabSpec("Fee details");
            fees.setIndicator("Fee details",getResources().getDrawable(R.drawable.icon_fee_details));
        Intent feesIntent = new Intent(this, Feedet_parents.class);
        fees.setContent(feesIntent);

        // Adding all TabSpec to TabHost
        tabHost.addTab(pho);
        tabHost.addTab(mrk);
        tabHost.addTab(fees);}}

My ambigution is,i guess only the problem is on Manifest.xml file.IS THERE ANY PERMISSIONS AVAILABLE TO MENTION FOR EVERY ACTIVITY?

---

Refer Manifest.xml source

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.demo.student"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="8"/>

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

        <activity android:name=".First_index"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Index_parent"></activity>


        <activity android:name=".Index_parent"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN1" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Parent_concpt"></activity>

        <activity android:name=".Parent_concept"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN3" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

         <!--  Att_parents -->
         <activity android:name=".Att_parents" />

         <!--  Achieve_parents -->
         <activity android:name=".Achieve_parents" />

         <!--  Feedet_parents -->
         <activity android:name=".Feedet_parents" />


        <activity android:name=".Index_principal"
                  android:label="@string/app_name">
             <intent-filter>
                <action android:name="android.intent.action.MAIN2" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </activity><activity android:name=".Princy_concept"></activity>

          <activity android:name=".Princy_concept"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN7" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </activity>

         <!--  Att_principal Activity -->
         <activity android:name=".Att_principal" />

         <!--  Perform_principal Activity -->
         <activity android:name=".Perform_principal" />

         <!--  Coll_principal Activity -->
         <activity android:name=".Coll_principal" />

         <!--  Xpense_principal Activity -->
         <activity android:name=".Xpense_principal" />

         </application>
    </manifest>

NOTE : I have perfectly mentioned each and every class and layout’s file name perfectly.

Please refer my logcat here
LOGCAT

05-21 12:13:16.013: W/KeyCharacterMap(274): No keyboard for id 0
05-21 12:13:16.013: W/KeyCharacterMap(274): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
05-21 12:13:19.843: D/AndroidRuntime(274): Shutting down VM
05-21 12:13:19.843: W/dalvikvm(274): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-21 12:13:19.853: E/AndroidRuntime(274): FATAL EXCEPTION: main
05-21 12:13:19.853: E/AndroidRuntime(274): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.demo.student/com.android.demo.student.Princy_concept}: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.os.Looper.loop(Looper.java:123)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.ActivityThread.main(ActivityThread.java:4627)
05-21 12:13:19.853: E/AndroidRuntime(274):  at java.lang.reflect.Method.invokeNative(Native Method)
05-21 12:13:19.853: E/AndroidRuntime(274):  at java.lang.reflect.Method.invoke(Method.java:521)
05-21 12:13:19.853: E/AndroidRuntime(274):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-21 12:13:19.853: E/AndroidRuntime(274):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-21 12:13:19.853: E/AndroidRuntime(274):  at dalvik.system.NativeStart.main(Native Method)
05-21 12:13:19.853: E/AndroidRuntime(274): Caused by: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.TabActivity.onContentChanged(TabActivity.java:105)
05-21 12:13:19.853: E/AndroidRuntime(274):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:201)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.Activity.setContentView(Activity.java:1647)
05-21 12:13:19.853: E/AndroidRuntime(274):  at com.android.demo.student.Princy_concept.onCreate(Princy_concept.java:16)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-21 12:13:19.853: E/AndroidRuntime(274):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
05-21 12:13:19.853: E/AndroidRuntime(274):  ... 11 more

Thanks for your help!

Answer 1

It is telling you that in your layout main3, you must have a TabHost named android.R.id.tabhost

In onCreate() you are inflating main3:

setContentView(R.layout.main3);

Open up main3.xml and make sure your layout looks something like this:

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

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:padding="5dp" >

        <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"
            android:padding="5dp" />
    </LinearLayout>

</TabHost>

Note the TabHost‘s name and the name of the TabWidget.

See here for a full example.