New to Android: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo

Question

This is my MyTasteActivity code:

package MyTaste;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MyTasteActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         TextView tv = new TextView(this);
         tv.setText("Hello, Android");
         setContentView(tv);

    }
}

This is my XML Android Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="My.Taste.App"
    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=".MyTaasteActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

So why do I keep getting this error:

06-14 20:22:48.779: E/AndroidRuntime(749): FATAL EXCEPTION: main

06-14 20:22:48.779: E/AndroidRuntime(749): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{My.Taste.App/My.Taste.App.MyTasteActivity}: java.lang.ClassNotFoundException: My.Taste.App.MyTasteActivity

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.app.ActivityThread.access$600(ActivityThread.java:123)

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)

06-14 20:22:48.779: E/AndroidRuntime(749):  at 
android.os.Handler.dispatchMessage(Handler.java:99)

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.os.Looper.loop(Looper.java:137)

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.app.ActivityThread.main(ActivityThread.java:4424)

06-14 20:22:48.779: E/AndroidRuntime(749):  at java.lang.reflect.Method.invokeNative(Native Method)

06-14 20:22:48.779: E/AndroidRuntime(749):  at java.lang.reflect.Method.invoke(Method.java:511)

06-14 20:22:48.779: E/AndroidRuntime(749):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

06-14 20:22:48.779: E/AndroidRuntime(749):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

06-14 20:22:48.779: E/AndroidRuntime(749):  at dalvik.system.NativeStart.main(Native Method)

06-14 20:22:48.779: E/AndroidRuntime(749): Caused by: java.lang.ClassNotFoundException: My.Taste.App.MyTasteActivity

06-14 20:22:48.779: E/AndroidRuntime(749):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)

06-14 20:22:48.779: E/AndroidRuntime(749):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)

06-14 20:22:48.779: E/AndroidRuntime(749):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.app.Instrumentation.newActivity(Instrumentation.java:1023)

06-14 20:22:48.779: E/AndroidRuntime(749):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)

06-14 20:22:48.779: E/AndroidRuntime(749):  ... 11 more

The AVD will show the message "Unfortunately, MyTaste has stopped." I have no clue what is wrong, and I have reinstalled Android SDK several times.

Answer 1

You specified the package as:

package="My.Taste.App"

While the package specified in the code is:

package MyTaste;

I think consistancy will fix this

Edit: The awnser below shows another consistancy issue.

Answer 2

The java class name is different than the Manifest definition..

public class MyTasteActivity extends Activity {

android:name=".MyTaasteActivity"

Notice the double a

The error is fairly self explanatory as well...

java.lang.ClassNotFoundException: My.Taste.App.MyTasteActivity

Answer 3

I had the same problem, but I had my activity declared in the Manifest file, with the correct name.

My problem was that I didn't have to imported a third party libraries in a "libs" folder, and I needed reference them in my proyect (Right-click, properties, Java Build Path, Libraries, Add Jar...).

About how do you declare an activity in the manifest file, is correct use .ActivityName always that activity be in the main package.

Answer 4

Another cause for give the same error, but on different line numbers is that:

class MyActivity ... { private String MyString = getString(R.strings.....);

You need to initialize everything in onCreate :)