my project should create multiple views based on user input (user send text, take a photo or record a video) similar to WhatsApp chat activity, almost same structure. The adapter should be able to identify which type of view the item is, by using getItemViewType(). if try to use video record functionality it works but if I try to take a photo or send a text the app crashes with the following error:
java.lang.ClassCastException: AppPackage.myAdapter$TextViewHolder cannot be cast to AppPackage.myAdapter$ImageViewHolder
all data taken from inputs is added to a List which then is passed to the onBindViewHolder
already tried to change onBindViewHolder( CustomViewHolder myViewHolder, int position) to onBindViewHolder(RecyclerView.ViewHolder, int position) and to add breaks at the of every "case" of the switch. still not working
public class myAdapter extends
RecyclerView.Adapter<RecyclerView.ViewHolder> {
List<ModelloDati> lista;
Context context;
public class ImageViewHolder extends RecyclerView.ViewHolder {
//ImageView mImage;
private ImageView imageView;
public ImageViewHolder(View itemView) {
super (itemView);
imageView = itemView.findViewById(R.id.immagine);
}
}
public class TextViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
private TextView titolo;
public TextViewHolder(View v) {
super(v);
titolo = itemView.findViewById(R.id.testo);
}
}
public class VideoViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
private VideoView videoView;
public VideoViewHolder(View v) {
super(v);
videoView = itemView.findViewById(R.id.rec);
}
}
public myAdapter(List<ModelloDati> lista,Context context) {
this.lista = lista;
this.context = context;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
if (viewType == 0) {
// create a new view
View v =
LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat_foto,
parent, false);
// set the view's size, margins, paddings and layout parameters
ImageViewHolder vh = new ImageViewHolder(v);
return vh;
}
if (viewType == 2) {
// create a new view
View v =
LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat_video,
parent, false);
// set the view's size, margins, paddings and layout parameters
VideoViewHolder vh = new VideoViewHolder(v);
return vh;
} else {
// create a new view
View v =
LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat_testo,
parent, false);
// set the view's size, margins, paddings and layout parameters
TextViewHolder vh = new TextViewHolder(v);
return vh;
}
}
@Override
public int getItemViewType(int position){
switch (lista.get(position).getTYPE()) {
case 0: return 0;
case 1: return 1;
case 2: return 2;
}
return 0;
}
@Override
public int getItemCount() {
if (lista == null)
return 0;
return lista.size();
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder myViewHolder, int
position) {
ModelloDati oggetto = lista.get(position);
switch (myViewHolder.getItemViewType()) {
case 0:
TextViewHolder viewHolder = (TextViewHolder) myViewHolder;
viewHolder.titolo.setText(oggetto.getTesto());
break;
case 1:
ImageViewHolder imageViewHolder = (ImageViewHolder)
myViewHolder;
imageViewHolder.imageView.setImageBitmap(oggetto.getImmagini());
imageViewHolder.imageView.setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
break;
case 2:
VideoViewHolder videoViewHolder = (VideoViewHolder)
myViewHolder;
videoViewHolder.videoView.setVideoURI(oggetto.getUri());
MediaController mediaController = new
MediaController(context);
mediaController.setAnchorView(videoViewHolder.videoView);
videoViewHolder.videoView.setMediaController(mediaController);
videoViewHolder.videoView.requestFocus();
videoViewHolder.videoView.start();
videoViewHolder.videoView.setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
break;
default:
viewHolder = (TextViewHolder) myViewHolder;
viewHolder.titolo.setText("ERRORE");
}
}
}
2019-05-21 10:24:18.728 11089-11089/com.sinfo.chat E/AndroidRuntime: FATAL
EXCEPTION: main
Process: com.sinfo.chat, PID: 11089
java.lang.ClassCastException: com.sinfo.chat.myAdapter$TextViewHolder cannot be
cast to com.sinfo.chat.myAdapter$ImageViewHolder
at com.sinfo.chat.myAdapter.onBindViewHolder(myAdapter.java:119)
at
android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6781)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6823)
at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6019)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5858)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5854)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2230)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1557)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1517)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:587)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3924)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3336)
at android.view.View.measure(View.java:23169)
at android.support.constraint.ConstraintLayout.internalMeasureChildren(ConstraintLayout.java:1227)
at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:1572)
at android.view.View.measure(View.java:23169)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
at android.view.View.measure(View.java:23169)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:401)
at android.view.View.measure(View.java:23169)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:23169)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1535)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:825)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:704)
at android.view.View.measure(View.java:23169)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:716)
at android.view.View.measure(View.java:23169)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2725)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1575)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1858)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1463)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7190)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)
at android.view.Choreographer.doCallbacks(Choreographer.java:761)
at android.view.Choreographer.doFrame(Choreographer.java:696)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6718)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
ImageViewHolder gets created with type 0 in onCreateViewHolder and casted with type 1 in onBindViewHolder. Use constants instead of floating magic numbers