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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package com.test.banner; | ||
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| import android.support.v7.widget.RecyclerView; | ||
| import android.view.Gravity; | ||
| import android.view.ViewGroup; | ||
| import android.widget.TextView; | ||
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| public class SampleAdapter extends RecyclerView.Adapter<SampleAdapter.ViewHolder> { | ||
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| private static final int NUM_ITEMS = 30; | ||
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| private String[] mDataset; | ||
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| public static class ViewHolder extends RecyclerView.ViewHolder { | ||
| private TextView mTextView; | ||
| public ViewHolder(TextView v) { | ||
| super(v); | ||
| mTextView = v; | ||
| } | ||
| } | ||
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| public SampleAdapter() { | ||
| mDataset = new String[NUM_ITEMS]; | ||
| for (int i = 0; i < NUM_ITEMS; i++) { | ||
| mDataset[i] = String.valueOf(i); | ||
| } | ||
| } | ||
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| @Override | ||
| public SampleAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, | ||
| int viewType) { | ||
| TextView textView = new TextView(parent.getContext()); | ||
| textView.setTextSize(16f); | ||
| textView.setGravity(Gravity.CENTER); | ||
| textView.setPadding(10,10,10,10); | ||
| return new ViewHolder(textView); | ||
| } | ||
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| @Override | ||
| public void onBindViewHolder(ViewHolder holder, int position) { | ||
| holder.mTextView.setText("This is item " + mDataset[position]); | ||
| } | ||
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| @Override | ||
| public int getItemCount() { | ||
| return mDataset.length; | ||
| } | ||
| } |
172 changes: 172 additions & 0 deletions
172
app/src/main/java/com/test/banner/common/BaseRecyclerAdapter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| package com.test.banner.common; | ||
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| import android.support.annotation.NonNull; | ||
| import android.support.v7.widget.RecyclerView; | ||
| import android.view.View; | ||
| import android.view.ViewGroup; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| public class BaseRecyclerAdapter<T extends RecyclerView.Adapter> extends RecyclerView.Adapter<RecyclerView.ViewHolder> { | ||
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| private final T mBase; | ||
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| /** | ||
| * Defines available view type integers for headers and footers. | ||
| * | ||
| * How this works: | ||
| * - Regular views use view types starting from 0, counting upwards | ||
| * - Header views use view types starting from -1000, counting upwards | ||
| * - Footer views use view types starting from -2000, counting upwards | ||
| * | ||
| * This means that you're safe as long as the base adapter doesn't use negative view types, | ||
| * and as long as you have fewer than 1000 headers and footers | ||
| */ | ||
| private static final int HEADER_VIEW_TYPE = -1000; | ||
| private static final int FOOTER_VIEW_TYPE = -2000; | ||
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| private final List<View> mHeaders = new ArrayList<View>(); | ||
| private final List<View> mFooters = new ArrayList<View>(); | ||
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| /** | ||
| * Constructor. | ||
| * | ||
| * @param base | ||
| * the adapter to wrap | ||
| */ | ||
| public BaseRecyclerAdapter(T base) { | ||
| super(); | ||
| mBase = base; | ||
| } | ||
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| /** | ||
| * Gets the base adapter that this is wrapping. | ||
| */ | ||
| public T getWrappedAdapter() { | ||
| return mBase; | ||
| } | ||
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| /** | ||
| * Adds a header view. | ||
| */ | ||
| public void addHeader(@NonNull View view) { | ||
| if (view == null) { | ||
| throw new IllegalArgumentException("You can't have a null header!"); | ||
| } | ||
| mHeaders.add(view); | ||
| } | ||
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| /** | ||
| * Adds a footer view. | ||
| */ | ||
| public void addFooter(@NonNull View view) { | ||
| if (view == null) { | ||
| throw new IllegalArgumentException("You can't have a null footer!"); | ||
| } | ||
| mFooters.add(view); | ||
| } | ||
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| /** | ||
| * Toggles the visibility of the header views. | ||
| */ | ||
| public void setHeaderVisibility(boolean shouldShow) { | ||
| for (View header : mHeaders) { | ||
| header.setVisibility(shouldShow ? View.VISIBLE : View.GONE); | ||
| } | ||
| } | ||
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| /** | ||
| * Toggles the visibility of the footer views. | ||
| */ | ||
| public void setFooterVisibility(boolean shouldShow) { | ||
| for (View footer : mFooters) { | ||
| footer.setVisibility(shouldShow ? View.VISIBLE : View.GONE); | ||
| } | ||
| } | ||
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| /** | ||
| * @return the number of headers. | ||
| */ | ||
| public int getHeaderCount() { | ||
| return mHeaders.size(); | ||
| } | ||
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| /** | ||
| * @return the number of footers. | ||
| */ | ||
| public int getFooterCount() { | ||
| return mFooters.size(); | ||
| } | ||
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| /** | ||
| * Gets the indicated header, or null if it doesn't exist. | ||
| */ | ||
| public View getHeader(int i) { | ||
| return i < mHeaders.size() ? mHeaders.get(i) : null; | ||
| } | ||
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| /** | ||
| * Gets the indicated footer, or null if it doesn't exist. | ||
| */ | ||
| public View getFooter(int i) { | ||
| return i < mFooters.size() ? mFooters.get(i) : null; | ||
| } | ||
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| private boolean isHeader(int viewType) { | ||
| return viewType >= HEADER_VIEW_TYPE && viewType < (HEADER_VIEW_TYPE + mHeaders.size()); | ||
| } | ||
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| private boolean isFooter(int viewType) { | ||
| return viewType >= FOOTER_VIEW_TYPE && viewType < (FOOTER_VIEW_TYPE + mFooters.size()); | ||
| } | ||
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| @Override | ||
| public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { | ||
| if (isHeader(viewType)) { | ||
| int whichHeader = Math.abs(viewType - HEADER_VIEW_TYPE); | ||
| View headerView = mHeaders.get(whichHeader); | ||
| return new RecyclerView.ViewHolder(headerView) { }; | ||
| } else if (isFooter(viewType)) { | ||
| int whichFooter = Math.abs(viewType - FOOTER_VIEW_TYPE); | ||
| View footerView = mFooters.get(whichFooter); | ||
| return new RecyclerView.ViewHolder(footerView) { }; | ||
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| } else { | ||
| return mBase.onCreateViewHolder(viewGroup, viewType); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) { | ||
| if (position < mHeaders.size()) { | ||
| // Headers don't need anything special | ||
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| } else if (position < mHeaders.size() + mBase.getItemCount()) { | ||
| // This is a real position, not a header or footer. Bind it. | ||
| mBase.onBindViewHolder(viewHolder, position - mHeaders.size()); | ||
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| } else { | ||
| // Footers don't need anything special | ||
| } | ||
| } | ||
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| @Override | ||
| public int getItemCount() { | ||
| return mHeaders.size() + mBase.getItemCount() + mFooters.size(); | ||
| } | ||
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| @Override | ||
| public int getItemViewType(int position) { | ||
| if (position < mHeaders.size()) { | ||
| return HEADER_VIEW_TYPE + position; | ||
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| } else if (position < (mHeaders.size() + mBase.getItemCount())) { | ||
| return mBase.getItemViewType(position - mHeaders.size()); | ||
|
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| } else { | ||
| return FOOTER_VIEW_TYPE + position - mHeaders.size() - mBase.getItemCount(); | ||
| } | ||
| } | ||
| } |
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