Also hier mal mein Code der ActivityKlasse:
1public class CaptnCookActivity extends Activity {
2 /** Called when the activity is first created. */
3
4 @Override
5 public void onCreate(Bundle savedInstanceState) {
6
7 super.onCreate(savedInstanceState);
8
9 Testklasse te = new Testklasse();
10 // Bei diesem Aufruf kommt eine NullpointerException
11 te.onCreateDBAndDBTabled(this);
12 setContentView(te.getNeueView(this));
13 }
und hier der Code der Testklasse:
1public class Testklasse{
2
3 // Beim Aufruf dieser Methode aus der ActivityKlasse folgt eine NullpointerException
4 public void onCreateDBAndDBTabled(Context con) {
5 SQLiteDatabase myDB = null;
6 try {
7 myDB = con.openOrCreateDatabase("CaptnTest", (Integer) null, null);
8 myDB.execSQL("CREATE TABLE .... ");
9 } finally {
10 if (myDB != null)
11 myDB.close();
12 }
13 }
14
15 // Diese Methode kann ich fehlerfrei aus der ActivityKlasse aufrufen
16 public TextView getNeueView(Context con){
17 TextView tv = new TextView(con);
18 tv.setText("Hallo das kommt von der Testklasse ");
19 return tv;
20 }
21}
Beim Aufruf der onCreateDBAndDBTabled(Context con) - Methode erhalte ich dieses Log:
05-20 12:49:00.565: D/AndroidRuntime(485): Shutting down VM
05-20 12:49:00.565: W/dalvikvm(485): threadid=1: thread exiting with uncaught exception (group=0x40014760)
05-20 12:49:00.678: E/AndroidRuntime(485): FATAL EXCEPTION: main
05-20 12:49:00.678: E/AndroidRuntime(485): java.lang.RuntimeException: Unable to start activity ComponentInfo{my.Captn.Cook/my.Captn.Cook.CaptnCookActivity}: java.lang.NullPointerException
05-20 12:49:00.678: E/AndroidRuntime(485): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.os.Handler.dispatchMessage(Handler.java:99)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.os.Looper.loop(Looper.java:126)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.app.ActivityThread.main(ActivityThread.java:3997)
05-20 12:49:00.678: E/AndroidRuntime(485): at java.lang.reflect.Method.invokeNative(Native Method)
05-20 12:49:00.678: E/AndroidRuntime(485): at java.lang.reflect.Method.invoke(Method.java:491)
05-20 12:49:00.678: E/AndroidRuntime(485): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
05-20 12:49:00.678: E/AndroidRuntime(485): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
05-20 12:49:00.678: E/AndroidRuntime(485): at dalvik.system.NativeStart.main(Native Method)
05-20 12:49:00.678: E/AndroidRuntime(485): Caused by: java.lang.NullPointerException
05-20 12:49:00.678: E/AndroidRuntime(485): at my.Captn.Cook.Testklasse.onCreateDBAndDBTabled(Testklasse.java:15)
05-20 12:49:00.678: E/AndroidRuntime(485): at my.Captn.Cook.CaptnCookActivity.onCreate(CaptnCookActivity.java:17)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
05-20 12:49:00.678: E/AndroidRuntime(485): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700)
05-20 12:49:00.678: E/AndroidRuntime(485): ... 11 more
Könnt ihr mir sagen an was das liegt???
