android: Convert GameAdapter to Kotlin
Charles Lombardo
bunnei
parent
87f4c3f105
commit
0d044e9f2f
@ -1,244 +0,0 @@
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package org.yuzu.yuzu_emu.adapters;
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import android.database.Cursor;
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import android.database.DataSetObserver;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.os.Build;
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import android.os.SystemClock;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.annotation.RequiresApi;
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import androidx.core.content.ContextCompat;
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import androidx.fragment.app.FragmentActivity;
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import androidx.recyclerview.widget.RecyclerView;
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import org.yuzu.yuzu_emu.YuzuApplication;
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import org.yuzu.yuzu_emu.R;
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import org.yuzu.yuzu_emu.activities.EmulationActivity;
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import org.yuzu.yuzu_emu.model.GameDatabase;
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import org.yuzu.yuzu_emu.ui.DividerItemDecoration;
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import org.yuzu.yuzu_emu.utils.FileUtil;
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import org.yuzu.yuzu_emu.utils.Log;
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import org.yuzu.yuzu_emu.utils.PicassoUtils;
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import org.yuzu.yuzu_emu.viewholders.GameViewHolder;
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import java.util.stream.Stream;
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/**
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* This adapter gets its information from a database Cursor. This fact, paired with the usage of
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* ContentProviders and Loaders, allows for efficient display of a limited view into a (possibly)
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* large dataset.
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*/
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public final class GameAdapter extends RecyclerView.Adapter<GameViewHolder> implements
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View.OnClickListener {
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private Cursor mCursor;
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private GameDataSetObserver mObserver;
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private boolean mDatasetValid;
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private long mLastClickTime = 0;
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/**
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* Initializes the adapter's observer, which watches for changes to the dataset. The adapter will
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* display no data until a Cursor is supplied by a CursorLoader.
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*/
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public GameAdapter() {
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mDatasetValid = false;
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mObserver = new GameDataSetObserver();
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}
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/**
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* Called by the LayoutManager when it is necessary to create a new view.
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*
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* @param parent The RecyclerView (I think?) the created view will be thrown into.
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* @param viewType Not used here, but useful when more than one type of child will be used in the RecyclerView.
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* @return The created ViewHolder with references to all the child view's members.
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*/
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@Override
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public GameViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
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// Create a new view.
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View gameCard = LayoutInflater.from(parent.getContext())
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.inflate(R.layout.card_game, parent, false);
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gameCard.setOnClickListener(this);
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// Use that view to create a ViewHolder.
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return new GameViewHolder(gameCard);
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}
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/**
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* Called by the LayoutManager when a new view is not necessary because we can recycle
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* an existing one (for example, if a view just scrolled onto the screen from the bottom, we
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* can use the view that just scrolled off the top instead of inflating a new one.)
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*
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* @param holder A ViewHolder representing the view we're recycling.
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* @param position The position of the 'new' view in the dataset.
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*/
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@RequiresApi(api = Build.VERSION_CODES.O)
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@Override
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public void onBindViewHolder(@NonNull GameViewHolder holder, int position) {
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if (mDatasetValid) {
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if (mCursor.moveToPosition(position)) {
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PicassoUtils.loadGameIcon(holder.imageIcon,
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mCursor.getString(GameDatabase.GAME_COLUMN_PATH));
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holder.textGameTitle.setText(mCursor.getString(GameDatabase.GAME_COLUMN_TITLE).replaceAll("[\\t\\n\\r]+", " "));
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holder.textGameCaption.setText(mCursor.getString(GameDatabase.GAME_COLUMN_CAPTION));
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// TODO These shouldn't be necessary once the move to a DB-based model is complete.
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holder.gameId = mCursor.getString(GameDatabase.GAME_COLUMN_GAME_ID);
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holder.path = mCursor.getString(GameDatabase.GAME_COLUMN_PATH);
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holder.title = mCursor.getString(GameDatabase.GAME_COLUMN_TITLE);
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holder.description = mCursor.getString(GameDatabase.GAME_COLUMN_DESCRIPTION);
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holder.regions = mCursor.getString(GameDatabase.GAME_COLUMN_REGIONS);
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holder.company = mCursor.getString(GameDatabase.GAME_COLUMN_CAPTION);
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final int backgroundColorId = isValidGame(holder.path) ? R.color.view_background : R.color.view_disabled;
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View itemView = holder.getItemView();
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itemView.setBackgroundColor(ContextCompat.getColor(itemView.getContext(), backgroundColorId));
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} else {
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Log.error("[GameAdapter] Can't bind view; Cursor is not valid.");
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}
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} else {
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Log.error("[GameAdapter] Can't bind view; dataset is not valid.");
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}
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}
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/**
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* Called by the LayoutManager to find out how much data we have.
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*
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* @return Size of the dataset.
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*/
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@Override
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public int getItemCount() {
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if (mDatasetValid && mCursor != null) {
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return mCursor.getCount();
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}
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Log.error("[GameAdapter] Dataset is not valid.");
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return 0;
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}
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/**
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* Return the contents of the _id column for a given row.
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*
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* @param position The row for which Android wants an ID.
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* @return A valid ID from the database, or 0 if not available.
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*/
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@Override
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public long getItemId(int position) {
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if (mDatasetValid && mCursor != null) {
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if (mCursor.moveToPosition(position)) {
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return mCursor.getLong(GameDatabase.COLUMN_DB_ID);
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}
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}
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Log.error("[GameAdapter] Dataset is not valid.");
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return 0;
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}
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/**
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* Tell Android whether or not each item in the dataset has a stable identifier.
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* Which it does, because it's a database, so always tell Android 'true'.
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*
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* @param hasStableIds ignored.
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*/
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@Override
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public void setHasStableIds(boolean hasStableIds) {
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super.setHasStableIds(true);
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}
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/**
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* When a load is finished, call this to replace the existing data with the newly-loaded
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* data.
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*
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* @param cursor The newly-loaded Cursor.
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*/
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public void swapCursor(Cursor cursor) {
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// Sanity check.
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if (cursor == mCursor) {
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return;
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}
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// Before getting rid of the old cursor, disassociate it from the Observer.
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final Cursor oldCursor = mCursor;
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if (oldCursor != null && mObserver != null) {
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oldCursor.unregisterDataSetObserver(mObserver);
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}
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mCursor = cursor;
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if (mCursor != null) {
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// Attempt to associate the new Cursor with the Observer.
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if (mObserver != null) {
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mCursor.registerDataSetObserver(mObserver);
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}
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mDatasetValid = true;
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} else {
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mDatasetValid = false;
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}
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notifyDataSetChanged();
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}
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/**
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* Launches the game that was clicked on.
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*
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* @param view The card representing the game the user wants to play.
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*/
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@Override
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public void onClick(View view) {
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// Double-click prevention, using threshold of 1000 ms
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if (SystemClock.elapsedRealtime() - mLastClickTime < 1000) {
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return;
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}
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mLastClickTime = SystemClock.elapsedRealtime();
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GameViewHolder holder = (GameViewHolder) view.getTag();
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EmulationActivity.launch((FragmentActivity) view.getContext(), holder.path, holder.title);
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}
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public static class SpacesItemDecoration extends DividerItemDecoration {
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private int space;
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public SpacesItemDecoration(Drawable divider, int space) {
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super(divider);
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this.space = space;
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}
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@Override
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public void getItemOffsets(Rect outRect, @NonNull View view, @NonNull RecyclerView parent,
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@NonNull RecyclerView.State state) {
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outRect.left = 0;
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outRect.right = 0;
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outRect.bottom = space;
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outRect.top = 0;
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}
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}
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private boolean isValidGame(String path) {
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return Stream.of(
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".rar", ".zip", ".7z", ".torrent", ".tar", ".gz").noneMatch(suffix -> path.toLowerCase().endsWith(suffix));
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}
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private final class GameDataSetObserver extends DataSetObserver {
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@Override
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public void onChanged() {
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super.onChanged();
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mDatasetValid = true;
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notifyDataSetChanged();
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}
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@Override
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public void onInvalidated() {
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super.onInvalidated();
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mDatasetValid = false;
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notifyDataSetChanged();
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}
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}
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}
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@ -0,0 +1,178 @@
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package org.yuzu.yuzu_emu.adapters
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import android.database.Cursor
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import android.database.DataSetObserver
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import androidx.core.content.ContextCompat
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import androidx.fragment.app.FragmentActivity
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import androidx.recyclerview.widget.RecyclerView
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import org.yuzu.yuzu_emu.R
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import org.yuzu.yuzu_emu.activities.EmulationActivity.Companion.launch
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import org.yuzu.yuzu_emu.model.GameDatabase
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import org.yuzu.yuzu_emu.utils.Log
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import org.yuzu.yuzu_emu.utils.PicassoUtils
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import org.yuzu.yuzu_emu.viewholders.GameViewHolder
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import java.util.*
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import java.util.stream.Stream
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/**
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* This adapter gets its information from a database Cursor. This fact, paired with the usage of
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* ContentProviders and Loaders, allows for efficient display of a limited view into a (possibly)
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* large dataset.
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*/
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class GameAdapter : RecyclerView.Adapter<GameViewHolder>(), View.OnClickListener {
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private var cursor: Cursor? = null
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private val observer: GameDataSetObserver?
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private var isDatasetValid = false
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/**
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* Initializes the adapter's observer, which watches for changes to the dataset. The adapter will
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* display no data until a Cursor is supplied by a CursorLoader.
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*/
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init {
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observer = GameDataSetObserver()
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}
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override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): GameViewHolder {
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// Create a new view.
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val gameCard = LayoutInflater.from(parent.context)
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.inflate(R.layout.card_game, parent, false)
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gameCard.setOnClickListener(this)
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// Use that view to create a ViewHolder.
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return GameViewHolder(gameCard)
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}
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override fun onBindViewHolder(holder: GameViewHolder, position: Int) {
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if (isDatasetValid) {
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if (cursor!!.moveToPosition(position)) {
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PicassoUtils.loadGameIcon(
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holder.imageIcon,
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cursor!!.getString(GameDatabase.GAME_COLUMN_PATH)
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)
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holder.textGameTitle.text =
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cursor!!.getString(GameDatabase.GAME_COLUMN_TITLE)
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.replace("[\\t\\n\\r]+".toRegex(), " ")
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holder.textGameCaption.text = cursor!!.getString(GameDatabase.GAME_COLUMN_CAPTION)
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// TODO These shouldn't be necessary once the move to a DB-based model is complete.
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holder.gameId = cursor!!.getString(GameDatabase.GAME_COLUMN_GAME_ID)
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holder.path = cursor!!.getString(GameDatabase.GAME_COLUMN_PATH)
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holder.title = cursor!!.getString(GameDatabase.GAME_COLUMN_TITLE)
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holder.description = cursor!!.getString(GameDatabase.GAME_COLUMN_DESCRIPTION)
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holder.regions = cursor!!.getString(GameDatabase.GAME_COLUMN_REGIONS)
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holder.company = cursor!!.getString(GameDatabase.GAME_COLUMN_CAPTION)
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val backgroundColorId =
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if (isValidGame(holder.path!!)) R.color.view_background else R.color.view_disabled
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val itemView = holder.itemView
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itemView.setBackgroundColor(
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ContextCompat.getColor(
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itemView.context,
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backgroundColorId
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)
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)
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} else {
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Log.error("[GameAdapter] Can't bind view; Cursor is not valid.")
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}
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} else {
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Log.error("[GameAdapter] Can't bind view; dataset is not valid.")
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}
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}
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override fun getItemCount(): Int {
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if (isDatasetValid && cursor != null) {
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return cursor!!.count
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}
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Log.error("[GameAdapter] Dataset is not valid.")
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return 0
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}
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/**
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* Return the contents of the _id column for a given row.
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*
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* @param position The row for which Android wants an ID.
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* @return A valid ID from the database, or 0 if not available.
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*/
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override fun getItemId(position: Int): Long {
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if (isDatasetValid && cursor != null) {
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if (cursor!!.moveToPosition(position)) {
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return cursor!!.getLong(GameDatabase.COLUMN_DB_ID)
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}
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}
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Log.error("[GameAdapter] Dataset is not valid.")
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return 0
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}
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/**
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* Tell Android whether or not each item in the dataset has a stable identifier.
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* Which it does, because it's a database, so always tell Android 'true'.
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*
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* @param hasStableIds ignored.
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*/
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override fun setHasStableIds(hasStableIds: Boolean) {
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super.setHasStableIds(true)
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}
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/**
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* When a load is finished, call this to replace the existing data with the newly-loaded
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* data.
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*
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* @param cursor The newly-loaded Cursor.
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*/
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fun swapCursor(cursor: Cursor) {
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// Sanity check.
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if (cursor === this.cursor) {
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return
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}
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// Before getting rid of the old cursor, disassociate it from the Observer.
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val oldCursor = this.cursor
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if (oldCursor != null && observer != null) {
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oldCursor.unregisterDataSetObserver(observer)
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}
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this.cursor = cursor
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isDatasetValid = if (this.cursor != null) {
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// Attempt to associate the new Cursor with the Observer.
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if (observer != null) {
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this.cursor!!.registerDataSetObserver(observer)
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}
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true
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} else {
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false
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}
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notifyDataSetChanged()
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}
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/**
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* Launches the game that was clicked on.
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*
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* @param view The card representing the game the user wants to play.
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*/
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override fun onClick(view: View) {
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val holder = view.tag as GameViewHolder
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launch((view.context as FragmentActivity), holder.path, holder.title)
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}
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private fun isValidGame(path: String): Boolean {
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return Stream.of(".rar", ".zip", ".7z", ".torrent", ".tar", ".gz")
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.noneMatch { suffix: String? ->
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path.lowercase(Locale.getDefault()).endsWith(suffix!!)
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}
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}
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private inner class GameDataSetObserver : DataSetObserver() {
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override fun onChanged() {
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super.onChanged()
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isDatasetValid = true
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notifyDataSetChanged()
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}
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override fun onInvalidated() {
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super.onInvalidated()
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isDatasetValid = false
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notifyDataSetChanged()
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}
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}
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}
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Reference in New Issue