[android help] Unable to instantiate activitiy Componentinfo

I know there are many other questions like this, but I read them all and can´t find an answer for my problem.

05-04 08:38:40.742: E/AndroidRuntime(18186): FATAL EXCEPTION: main
05-04 08:38:40.742: E/AndroidRuntime(18186): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.unserekinder/com.example.unserekinder.MainActivity}: java.lang.NullPointerException
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.os.Looper.loop(Looper.java:137)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.ActivityThread.main(ActivityThread.java:5041)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at java.lang.reflect.Method.invokeNative(Native Method)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at java.lang.reflect.Method.invoke(Method.java:511)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at dalvik.system.NativeStart.main(Native Method)
05-04 08:38:40.742: E/AndroidRuntime(18186): Caused by: java.lang.NullPointerException
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.Activity.findViewById(Activity.java:1839)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at com.example.unserekinder.MainActivity.(MainActivity.java:34)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at java.lang.Class.newInstanceImpl(Native Method)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at java.lang.Class.newInstance(Class.java:1319)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
05-04 08:38:40.742: E/AndroidRuntime(18186):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)

Manifest.xml:

    package="com.example.unserekinder"
    android:versionCode="1"
    android:versionName="1.0" >

            android:minSdkVersion="8"
        android:targetSdkVersion="17" />

            android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
                    android:name="com.example.unserekinder.MainActivity"
            android:label="@string/app_name" >
            
                

                
            
        
                    android:name="com.example.unserekinder.NeuesKind"
            android:label="@string/title_activity_neues_kind" >
        
    

How you can see, all my Activites are defined in my Manifest.xml. There are also no abstract classes. Can´t find the problem.

My MainActivity:

package com.example.unserekinder;

...

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listview_fuellen();

        Button b = (Button) findViewById(R.id.btNeuesKind);
        b.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this, NeuesKind.class);
                startActivity(i);

            }
        });
    }
    DBHelper db = new DBHelper(this);
    ListView lv = (ListView) findViewById(R.id.lvKinder);
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    public void listview_fuellen(){
        Cursor c = db.select();
        int count = c.getCount();
        String values[] = new String[count+1];
        int i = 0;

        while(c.moveToNext())
        { 
            values[i]= c.getString(c.getColumnIndex("name"));
            i++;
        }


        ArrayAdapter adapter = new ArrayAdapter(getBaseContext(),
                  android.R.layout.activity_list_item, android.R.id.text1,values);

        lv.setAdapter(adapter);
    }
}

What else could be the problem?

.

stackoverflow.comm