我试图通过按回收物品来显示碎片中的吐司，但我看不到它
注意：附加到我班级的日志中没有错误
这是我的片段
public class FotoFragment extends Fragment
{
private Cursor cursor;
private int columnIndex;
private static final String TAG = "RecyclerViewExample";
private List<DataPictures> mediaList = new ArrayList<>();
private RecyclerView mRecyclerView;
private MediaRVAdapter adapter;
String type = "";
public FotoFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
type = "images";
new MediaAsyncTask().execute(type);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_blank, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 3));
return view;
}
public class MediaAsyncTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
Integer result = 0;
String type = params[0];
try {
mediaList = new ArrayList<>();
if (type.equalsIgnoreCase("images")) {
result = 1;
}
} catch (Exception e) {
e.printStackTrace();
result = 0;
}
return result;
}
@Override
protected void onPostExecute(Integer result) {
if (result == 1) {
adapter = new MediaRVAdapter(getActivity(), mediaList);
mRecyclerView.setAdapter(adapter);
mRecyclerView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(), "Click pressed",Toast.LENGTH_SHORT).show();
}
});
} else {
Log.e(TAG, "Failed to show list");
}
}
}
}
这是我的适配器
public class MediaRVAdapter extends RecyclerView.Adapter<MediaListRowHolder> {
private List<DataPictures> itemList;
private Context mContext;
public MediaRVAdapter(Context context, List<DataPictures> itemList) {
this.itemList = itemList;
this.mContext = context;
}
@Override
public MediaListRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, null);
MediaListRowHolder mh = new MediaListRowHolder(v);
return mh;
}
@Override
public void onBindViewHolder(MediaListRowHolder mediaListRowHolder, int i) {
try{
DataPictures item = itemList.get(i);
Uri uri = Uri.fromFile(new File(item.getFilePath()));
if(item.getFileType().equalsIgnoreCase("video")) {
Bitmap bmThumbnail = ThumbnailUtils.
extractThumbnail(ThumbnailUtils.createVideoThumbnail(item.getFilePath(),
MediaStore.Video.Thumbnails.FULL_SCREEN_KIND), 90, 60);
if(bmThumbnail != null) {
mediaListRowHolder.thumbnail.setImageBitmap(bmThumbnail);
}
} else if (item.getFileType().equalsIgnoreCase("audio")) {
MediaMetadataRetriever mmr = new MediaMetadataRetriever();
mmr.setDataSource(item.getFilePath());
try{
if (mmr != null) {
byte[] art = mmr.getEmbeddedPicture();
Bitmap bmp = BitmapFactory.decodeByteArray(art,0,art.length);
if(bmp != null) {
bmp= ThumbnailUtils.extractThumbnail(bmp,90,60);
mediaListRowHolder.thumbnail.setImageBitmap(bmp);
}
}
}catch (Exception e){
e.printStackTrace();
}
}else {
Picasso.with(mContext).load(uri)
.error(R.drawable.logo_slogan)
.placeholder(R.drawable.logo_slogan)
.centerCrop()
.resize(90, 60)
.into(mediaListRowHolder.thumbnail);
}
}catch (Exception e) {
e.printStackTrace();
}
}
@Override
public int getItemCount() {
return (null != itemList ? itemList.size() : 0);
}
}
适配器类适配器
public class MediaListRowHolder extends RecyclerView.ViewHolder {
protected ImageView thumbnail;
protected TextView title;
public MediaListRowHolder(View view) {
super(view);
this.thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
this.title = (TextView) view.findViewById(R.id.title);
}
}
溶液：
public class MediaListRowHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
protected ImageView thumbnail;
protected TextView title;
public MediaListRowHolder(View view) {
super(view);
this.thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
this.title = (TextView) view.findViewById(R.id.title);
view.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "position = " + getPosition(), Toast.LENGTH_SHORT).show();
}
}
答案 0 :(得分：0)
我认为你可以这样做，例如以下代码：
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
/**
* Author：Administrator on 2016/9/2 0002 20:37
* Contact：289168296@qq.com
*/
public abstract class OnItemSelectedListener implements RecyclerView.OnItemTouchListener{
private final GestureDetector mGestureDetector;
public OnItemSelectedListener(Context context){
mGestureDetector = new GestureDetector(context,
new GestureDetector.SimpleOnGestureListener(){
@Override public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
}
public abstract void onItemSelected(RecyclerView.ViewHolder holder, int position);
@Override public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
if (mGestureDetector.onTouchEvent(e)) {
View touchedView = rv.findChildViewUnder(e.getX(), e.getY());
onItemSelected(rv.findContainingViewHolder(touchedView),
rv.getChildAdapterPosition(touchedView));
}
return false;
}
@Override public void onTouchEvent(RecyclerView rv, MotionEvent e) {
throw new UnsupportedOperationException("Not implemented");
}
@Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
throw new UnsupportedOperationException("Not implemented");
}
}
然后到RecycleView注册事件，可以处理事件：
private RecyclerView grid;
grid.setAdapter(new PhotoAdapter(this, relevantPhotos));
grid.addOnItemTouchListener(new OnItemSelectedListener(MainActivity.this) {
@Override public void onItemSelected(RecyclerView.ViewHolder holder, int position) {
if (!(holder instanceof PhotoViewHolder)) {
return;
}
PhotoItemBinding binding = ((PhotoViewHolder) holder).getBinding();
final Intent intent = getDetailActivityStartIntent(MainActivity.this, relevantPhotos, position, binding);
final ActivityOptions activityOptions = getActivityOptions(binding);
MainActivity.this.startActivityForResult(intent, IntentUtil.REQUEST_CODE,
activityOptions.toBundle());
}
});
PhotoAdapter.java：
import android.content.Context;
import android.databinding.DataBindingUtil;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import com.bumptech.glide.Glide;
import com.googlesamples.unsplash.R;
import com.googlesamples.unsplash.data.model.Photo;
import com.googlesamples.unsplash.databinding.PhotoItemBinding;
import com.googlesamples.unsplash.ui.ImageSize;
import java.util.ArrayList;
public class PhotoAdapter extends RecyclerView.Adapter<PhotoViewHolder> {
private final ArrayList<Photo> photos;
private final int requestedPhotoWidth;
private final LayoutInflater layoutInflater;
public PhotoAdapter(@NonNull Context context, @NonNull ArrayList<Photo> photos) {
this.photos = photos;
requestedPhotoWidth = context.getResources().getDisplayMetrics().widthPixels;
layoutInflater = LayoutInflater.from(context);
}
@Override
public PhotoViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
return new PhotoViewHolder((PhotoItemBinding) DataBindingUtil.inflate(layoutInflater,
R.layout.photo_item, parent, false));
}
@Override
public void onBindViewHolder(final PhotoViewHolder holder, final int position) {
PhotoItemBinding binding = holder.getBinding();
Photo data = photos.get(position);
binding.setData(data);
binding.executePendingBindings();
Glide.with(layoutInflater.getContext())
.load(holder.getBinding().getData().getPhotoUrl(requestedPhotoWidth))
.placeholder(R.color.placeholder)
.override(ImageSize.NORMAL[0], ImageSize.NORMAL[1])
.into(holder.getBinding().photo);
}
@Override
public int getItemCount() {
return photos.size();
}
@Override
public long getItemId(int position) {
return photos.get(position).id;
}
}