我有两个类1st class Loader有recycleler视图，第二个类有onBinderViewHolder，所以问题是我应该在哪个类中注册上下文视图，哪个类应该声明上下文菜单类。任何帮助将不胜感激。
public class LoaderActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<List<Music>> {
private RecyclerView mRecyclerView;
private MusicAdapter musicAdapter;
public static final String TAG = "YOUR-TAG-NAME";
@Override
protected void onCreate(Bundle savedInstanceState) {
onContentChanged();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_loader);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowCustomEnabled(true);
LayoutInflater inflator = (LayoutInflater) this .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflator.inflate(R.layout.custom_imageview, null);
actionBar.setCustomView(v);
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerVw);
// Use a LinearLayoutManager to make the RecyclerView display the Music in a vertically scrolling list.
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
musicAdapter = new MusicAdapter(this, new ArrayList<Music>());
mRecyclerView.setAdapter(musicAdapter);
final LoaderManager supportLoaderManager = getSupportLoaderManager();
supportLoaderManager.initLoader(1, null, this);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}``
@Override
public Loader<List<Music>> onCreateLoader(int id, Bundle args) {
return new MusicLoader(this);
}
@Override
public void onLoadFinished(Loader<List<Music>> loader, List<Music> data) {
// Add the newly loaded music to adapter.
musicAdapter.clearItem();
musicAdapter.addItems(data);
}
@Override
public void onLoaderReset(Loader<List<Music>> loader) {
// Clear the old music because a new list is going to be coming.
musicAdapter.clearItem();
}
MusicAdapter.java
public class MusicAdapter extends RecyclerView.Adapter<MusicAdapter.MusicViewHolder> {
Context mContext;
List<Music> mMusic;
BitmapDrawable mPlaceholder;
LruCache<Long, Bitmap> mBitmapCache;
public Uri track;
private int selectedPosition;
public MusicAdapter(Context context, List<Music> music) {
mMusic = new ArrayList<>();
if(music != null) {
mMusic.addAll(music);
}
mContext = context;
mPlaceholder = (BitmapDrawable) mContext.getResources().getDrawable(R.drawable.ic_music_note_black_48dp);
// Get the maximum size of byte we are allowed to allocate on the VM head and convert it to bytes.
int maxSize = (int) (Runtime.getRuntime().maxMemory() / 1024);
// Divide the maximum size by eight to get a adequate size the LRU cache should reach before it starts to evict bitmaps.
int cacheSize = maxSize / 8;
mBitmapCache = new LruCache<Long, Bitmap>(cacheSize) {
@Override
protected int sizeOf(Long key, Bitmap value) {
// returns the size of bitmaps in kilobytes.
return value.getByteCount() / 1024;
}
};
}
@Override
public MusicViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(mContext);
View v = inflater.inflate(R.layout.list_item, parent, false);
MusicViewHolder musicViewHolder = new MusicViewHolder(v);
return musicViewHolder;
}
@Override
public void onBindViewHolder(MusicViewHolder holder, final int position) {
final Music music = mMusic.get(position);
holder.itemView.setLongClickable(true);
// Check the Bitmap cache for the album art first..
final Bitmap bitmap = mBitmapCache.get(music.getAlbumId());
// If the bitmap is not null, then use the cached images.
if(bitmap != null){
holder.icon.setImageBitmap(bitmap);
}
else {
// No album art could be found in the cache try reloading it.
// In a real work example you should check that this value is not some junk value indicating that their is no album artwork.
loadAlbumArt(holder.icon, music.getAlbumId());
}
holder.artist.setText(music.getArtist());
holder.title.setText(music.getTitle());
final Uri trackuri= ContentUris.withAppendedId(
android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, music.getId());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(mContext, Playrecord.class);
intent.setData(trackuri);
mContext.startActivity(intent);
}
});
}