Question

FATAL EXCEPTION
E/AndroidRuntime(535): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.This.Calculator/com.This.Calculator.BatteryCalculatorActivity}: java.lang.ClassNotFoundException: com.This.Calculator.ThisBatteryCalculatorActivity

I was just following the tutorial of Android Developers for Tab View and I’d like to think that I followed it to the word… But it seems that I haven’t. Can someone please help me?
I’m using eclipse btw.

Here are my codes:

for the ThisBatteryCalculator

  package com.This.Calculator;

import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TabHost;



@SuppressWarnings("deprecation")
public class ThisBatteryCalculator extends TabActivity {
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Resources res = getResources(); // Resource object to get Durables
    TabHost tabHost = getTabHost();  // The activity TabHost
    TabHost.TabSpec spec;  // Reusable TabSpec for each tab
    Intent intent;  // Reusable Intent for each tab

    // Create an Intent to launch an Activity for the tab (to be reused)
    intent = new Intent().setClass(this, ArtistsActivity.class);

    // Initialize a TabSpec for each tab and add it to the TabHost
    spec = tabHost.newTabSpec("artists").setIndicator("Artists",
                      res.getDrawable(R.drawable.ic_tab_artists))
                  .setContent(intent);
    tabHost.addTab(spec);

    // Do the same for the other tabs
    intent = new Intent().setClass(this, AlbumsActivity.class);
    spec = tabHost.newTabSpec("albums").setIndicator("Albums",
                      res.getDrawable(R.drawable.ic_tab_albums))
                  .setContent(intent);
    tabHost.addTab(spec);

    intent = new Intent().setClass(this, SongActivity.class);
    spec = tabHost.newTabSpec("songs").setIndicator("Songs",
                      res.getDrawable(R.drawable.ic_tab_songs))
                  .setContent(intent);
    tabHost.addTab(spec);

    tabHost.setCurrentTab(2);
}
}

for my manifest:

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

<uses-sdk android:minSdkVersion="15" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".ThisBatteryCalculatorActivity"          
        android:label="@string/app_name" >
        android:theme="@android:style/Theme.NoTitleBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
 </activity>
        <activity android:name=".ArtistsActivity"
          android:label="@string/app_name" 
          android:theme="@android:style/Theme.NoTitleBar">
</activity>

<activity android:name=".SongActivity"
          android:label="@string/app_name" 
          android:theme="@android:style/Theme.NoTitleBar">
</activity>

<activity android:name=".AlbumsActivity"
          android:label="@string/app_name" 
          android:theme="@android:style/Theme.NoTitleBar">
</activity>

</application>



</manifest>

and finally for my main.xml:

<?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:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    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>

Any help would be greatly appreciated! Thank you!

Answer 1

In your manifest, you have ThisBatteryCalculatorActivity as the name of the activity class.

In your source code, you have ThisBatteryCalculator as the name of the activity class.

ThisBatteryCalculatorActivity and ThisBatteryCalculator are not the same. They need to be the same. Which you choose is up to you. Either rename the class to ThisBatteryCalculatorActivity or adjust your manifest to refer to ThisBatteryCalculator.