Want to start a standalone android project with a button in another project. First made a simple main app with a button that was referring to another project with Hello World with "is Library in Preferences". All according http://developer.android.com/tools/projects/projects-eclipse.html#SettingUpLibraryProject and it worked without problems.
Did the same thing with an open soruce project (puzzle) http://code.google.com/p/androidsoft/source/browse/#svn%2Ftrunk%2Fpuzzle but get an error message in LogCat and my appa crashes when I click the button in my main app. Guess I may have missed something in AndroidManifest.xml According to the documentation it says Declaring library components in the manifest file: You must declare any <activity>, <service>, <receiver>, <provider>, and so on, as well as <permission>, <uses-library>. I can compile puzzle as their own project without any problems. If the puzzle is a library will not work. My main app with a button that will start the second project public class AppActivity extends Activity { Button button; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); addListenerOnButton(); } public void addListenerOnButton() { final Context context = this; button = (Button) findViewById(R.id.button1); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(context, org.androidsoft.games.puzzle.kids.MainActivity.class); startActivity(intent); } }); } } AndroidManifest.xml in my main app with android:name="org.androidsoft.games.puzzle.kids.MainActivity <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"; package="com.mkyong.android" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:label="@string/app_name" android:name=".AppActivity" > <intent-filter > <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="org.androidsoft.games.puzzle.kids.MainActivity"> </activity> </application> </manifest> AndroidManifest.xml in puzzle that I want to use as a library http://code.google.com/p/androidsoft/source/browse/trunk/puzzle/AndroidManifest.xml LogCat error 08-08 12:44:31.607: E/AndroidRuntime(780): FATAL EXCEPTION: main 08-08 12:44:31.607: E/AndroidRuntime(780): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mkyong.android/org.androidsoft.games.puzzle.kids.MainActivity}: java.lang.NullPointerException 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.ActivityThread.access$600(ActivityThread.java:130) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.os.Handler.dispatchMessage(Handler.java:99) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.os.Looper.loop(Looper.java:137) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.ActivityThread.main(ActivityThread.java:4745) 08-08 12:44:31.607: E/AndroidRuntime(780): at java.lang.reflect.Method.invokeNative(Native Method) 08-08 12:44:31.607: E/AndroidRuntime(780): at java.lang.reflect.Method.invoke(Method.java:511) 08-08 12:44:31.607: E/AndroidRuntime(780): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-08 12:44:31.607: E/AndroidRuntime(780): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-08 12:44:31.607: E/AndroidRuntime(780): at dalvik.system.NativeStart.main(Native Method) 08-08 12:44:31.607: E/AndroidRuntime(780): Caused by: java.lang.NullPointerException 08-08 12:44:31.607: E/AndroidRuntime(780): at org.androidsoft.games.puzzle.kids.AbstractMainActivity.onCreate(AbstractMainActivity.java:81) 08-08 12:44:31.607: E/AndroidRuntime(780): at org.androidsoft.games.puzzle.kids.MainActivity.onCreate(MainActivity.java:57) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.Activity.performCreate(Activity.java:5008) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 08-08 12:44:31.607: E/AndroidRuntime(780): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 08-08 12:44:31.607: E/AndroidRuntime(780): ... 11 more -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
