Question

I am attempting to run commonsguy’s MergeAdapterDemo. The code compiles and runs fine when i comment out the calls to addView. For example, this runs fine:

public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);

    adapter=new MergeAdapter();
    arrayAdapter=buildFirstList();
    adapter.addAdapter(arrayAdapter);
    //adapter.addView(buildButton(), true);
    adapter.addAdapter(buildSecondList());
    //adapter.addView(buildLabel());
    adapter.addAdapter(buildSecondList());

However, this will crash:

public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);

    adapter=new MergeAdapter();
    arrayAdapter=buildFirstList();
    adapter.addAdapter(arrayAdapter);
    adapter.addView(buildButton(), true);
    adapter.addAdapter(buildSecondList());
    adapter.addView(buildLabel());
    adapter.addAdapter(buildSecondList());

Here is the callstack when the crash occurs:

Thread [<1> main] (Suspended (exception NoClassDefFoundError))  
    MergeAdapter.addViews(List, boolean) line: 101  
    MergeAdapter.addView(View, boolean) line: 78    
    MergeAdapter.addView(View) line: 64 
    MergeAdapterDemo.onCreate(Bundle) line: 52  
    Instrumentation.callActivityOnCreate(Activity, Bundle) line: 1047   
    ActivityThread.performLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 1611    
    ActivityThread.handleLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 1663 
    ActivityThread.access$1500(ActivityThread, ActivityThread$ActivityClientRecord, Intent) line: 117   
    ActivityThread$H.handleMessage(Message) line: 931   
    ActivityThread$H(Handler).dispatchMessage(Message) line: 99 
    Looper.loop() line: 123 
    ActivityThread.main(String[]) line: 3683    
    Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
    Method.invoke(Object, Object...) line: 507  
    ZygoteInit$MethodAndArgsCaller.run() line: 839  
    ZygoteInit.main(String[]) line: 597 
    NativeStart.main(String[]) line: not available [native method]

I am using the prebuilt .jar file that was located in the download section of his page.

Any suggestions on how to get this working? Thanks!

Answer 1

Line 101 is

 addAdapter(new SackOfViewsAdapter(views));

But you don’t have SackOfViewsAdapter class.

https://github.com/commonsguy/cwac-merge/blob/master/README.markdown says that:

This project requires the CWAC SackOfViewsAdapter. A copy of a
compatible JAR can be found in the libs/ directory of the project,
though you are welcome to try newer ones, or ones that you have
patched yourself.

So you need to include that library in your project as well.