I have created a working example of what you are trying to accomplish. The source of the errors you experience is mostly that you don't understand view recycling. I am not going to explain the whole thing to you now, but anyway here is the example:
For the example I used this layout for each row:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:id="@+id/background"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="80dp">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"/>
</FrameLayout>
I used this model:
public class ExampleModel {
private final int mColor;
private final String mText;
public ExampleModel(int color, String text) {
mColor = color;
mText = text;
}
public int getColor() {
return mColor;
}
public String getText() {
return mText;
}
}
And this view holder:
public class ExampleViewHolder extends RecyclerView.ViewHolder {
private final FrameLayout mBackground;
private final TextView mTextView;
public ExampleViewHolder(View itemView) {
super(itemView);
mBackground = (FrameLayout) itemView.findViewById(R.id.background);
mTextView = (TextView) itemView.findViewById(R.id.textView);
}
public void bind(ExampleModel model) {
mBackground.setBackgroundColor(model.getColor());
mTextView.setText(model.getText());
}
}
As you can see nothing special, the Adapter implementation is equally simple:
public class ExampleAdapter extends RecyclerView.Adapter<ExampleViewHolder> {
private final LayoutInflater mInflater;
private final List<ExampleModel> mModels;
public ExampleAdapter(Context context, List<ExampleModel> models) {
mInflater = LayoutInflater.from(context);
mModels = models;
}
@Override
public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View itemView = mInflater.inflate(R.layout.item_example, parent, false);
return new ExampleViewHolder(itemView);
}
@Override
public void onBindViewHolder(ExampleViewHolder holder, int position) {
final ExampleModel model = mModels.get(position);
holder.bind(model);
}
@Override
public int getItemCount() {
return mModels.size();
}
}
And you use the whole thing like this:
final Random mRandom = new Random(System.currentTimeMillis());
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
final List<ExampleModel> models = new ArrayList<>();
for (int i = 0; i < 100; i++) {
final int randomColor = generateRandomPastelColor();
models.add(new ExampleModel(randomColor, String.valueOf(i)));
}
final ExampleAdapter adapter = new ExampleAdapter(getActivity(), models);
recyclerView.setAdapter(adapter);
}
public int generateRandomPastelColor() {
final int baseColor = Color.WHITE;
final int red = (Color.red(baseColor) + mRandom.nextInt(256)) / 2;
final int green = (Color.green(baseColor) + mRandom.nextInt(256)) / 2;
final int blue = (Color.blue(baseColor) + mRandom.nextInt(256)) / 2;
return Color.rgb(red, green, blue);
}
This should do what you are looking for and you can use it as an example of how to implement your Adapter.
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