视频库不滚动平滑

我正在使用网格视图，从布局中充气custom_layout。网格视图正在从手机加载视频并以缩略图的形式填充视频。一切工作正常。滚动网格视图时出现问题。据滚动较慢，这在手机，其API> 20是给消息该应用程序没有响应视频库不滚动平滑

我已经按照这个链接，但并没有找到完美的解决方案： Gridview is scrolling slow

我已经使用异步任务从图库中加载视频。我给出了相同的代码。这里是我的片段：

1 AddFragment.java

public class AddFragment extends Fragment { 

private ImageButton imageButton; 
private GridView gridView; 
private ProgressDialog videoProgressDialog; 
ArrayList<File> list = new ArrayList<>(); 
ImageAdapter imageAdapter; 

public AddFragment() { 
    // Required empty public constructor 
} 


@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View view = inflater.inflate(R.layout.fragment_add, container, false); 

    imageButton = (ImageButton) view.findViewById(R.id.gotoButton); 

    gridView = (GridView) view.findViewById(R.id.grid_view); 
    gridView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 
    Log.e("ADD_VIDEOS","FRAGMENT CREATED"); 
    videoProgressDialog = new ProgressDialog(getContext()); 
    videoProgressDialog.setTitle("Loading Videos"); 
    videoProgressDialog.setMessage("please wait....."); 
    videoProgressDialog.setCancelable(false); 
    videoProgressDialog.show(); 

    LoadVideoTask videoTask = new LoadVideoTask(); 
    videoTask.execute(new File("/mnt")); 

    return view; 
} 

//reading the file from the storage 
void videoReader(File root) { 


    File[] file = root.listFiles(); 

    if (file != null) { 

     for (File aFile : file) { 
      if (!aFile.isDirectory()) { 
       if (aFile.getName().endsWith(".mp4")) { 
        Log.e("VIDEO_FILE=====", aFile.getName()); 
        list.add(aFile); 
       } 
      } else 
       videoReader(aFile); 
     } 
    } else{} 
} 

//Show hide select button if images are selected or deselected 
public void showSelectButton() { 
    ArrayList<String> selectedItems = imageAdapter.getCheckedItems(); 
    Log.e("CHECKED_ITEMS",imageAdapter.getCheckedItems().toString()); 
    if (selectedItems.size() > 0) { 
     imageButton.setVisibility(View.VISIBLE); 
    } else 
     imageButton.setVisibility(View.GONE); 

} 

class ImageAdapter extends BaseAdapter { 


    private Bitmap bitmap; 

    private LayoutInflater inflater; 
    SparseBooleanArray mSparseBooleanArray; 

    private final Context context; 

    private ImageAdapter(Context c) { 
     context = c; 
     //changes done from here 
     mSparseBooleanArray = new SparseBooleanArray(); 

    } 

    //Method to return selected Images 
    public ArrayList<String> getCheckedItems() { 
     ArrayList<String> mTempArry = new ArrayList<String>(); 

     for (int i = 0; i < list.size(); i++) { 
      if (mSparseBooleanArray.get(i)) { 
       mTempArry.add(list.get(i).toString()); 
      } 
     } 

     return mTempArry; 
    } 


    //for the video numbers 
    @Override 
    public int getCount() { 
     return list.size(); 
    } 

    //for getting the video items position vise 
    @Override 
    public Object getItem(int position) { 
     return list.get(position); 
    } 

    @Override 
    public long getItemId(int i) { 
     return i; 
    } 


    @Override 
    public View getView(int position, View convertView, ViewGroup viewGroup) { 

     View v; 

     if (convertView == null) { 

      inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      v = inflater.inflate(R.layout.custom_gridview,viewGroup,false); 
      v.setLayoutParams(new AbsListView.LayoutParams(215,215)); 

     } else { 
      // picturesView = (ImageView) convertView; 
      v = (View)convertView; 
     } 

     Viewholder viewHolder = new Viewholder(v); 
     //viewHolder.imageView.setId(position); 
     viewHolder.id = position; 
     //convertView.setTag(viewHolder); 

     //loading images from the videos 
     if (list.get(position).toString().contains(".jpg")) { 
      bitmap = BitmapFactory.decodeFile(list.get(position).toString()); //Creation of Thumbnail of image 
      // viewHolder.imageView.setImageBitmap(bitmap); 
     } else { 
      if (list.get(position).toString().contains(".mp4")) { 
       bitmap = ThumbnailUtils.createVideoThumbnail(list.get(position).toString(), 1); //Creation of Thumbnail of video 
       viewHolder.imageView.setImageBitmap(bitmap); 
      } 
     } 

     //picturesView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
     //picturesView.setAdjustViewBounds(true); 
     //picturesView.setLayoutParams(new GridView.LayoutParams(215, 215)); 
     //picturesView.setImageBitmap(bitmap); 
     //setting layout params for every device 

     viewHolder.checkBox.setTag(position); 
     viewHolder.checkBox.setChecked(mSparseBooleanArray.get(position)); 
     CompoundButton.OnCheckedChangeListener mCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() { 
      @Override 
      public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) { 
       mSparseBooleanArray.put((Integer) compoundButton.getTag(), isChecked);//Insert selected checkbox value inside boolean array 
       showSelectButton(); 
      } 
     }; 
     viewHolder.checkBox.setOnCheckedChangeListener(mCheckedChangeListener); 


     //return picturesView; 
     return v; 

    } 

    class Viewholder { 
     public ImageView imageView; 
     public CheckBox checkBox; 
     public int id; 
     public Viewholder(View v){ 
      imageView = (ImageView) v.findViewById(R.id.galleryImageView); 
      checkBox = (CheckBox) v.findViewById(R.id.selectCheckBox); 
     } 
    } 
} 

//asynch task has been done to do the processing in the background for loading the videos 
//three parametres are Params,Progress,Result 
private class LoadVideoTask extends AsyncTask<File,Integer, Integer>{ 


    @Override 
    protected Integer doInBackground(File... files) { 
     for(int i=0;i<files.length;i++) { 
      videoReader(files[i]); 
      Log.e("VIDEO_LOAD", files[i].toString()); 
     } 
     return files.length; 
    } 

    @Override 
    protected void onProgressUpdate(Integer... values) { 
     super.onProgressUpdate(values); 
     videoProgressDialog.setProgress(values[0]); 
    } 

    @Override 
    protected void onPostExecute(Integer integer) { 
     super.onPostExecute(integer); 
     updateUI(); 
    } 
} 

private void updateUI() { 

    videoProgressDialog.dismiss(); 
    //calling imageadapter class in here 
    imageAdapter = new ImageAdapter(getContext()); 
    //for not repeating of the files 
    LinkedHashSet<File> fileList = new LinkedHashSet<>(); 
    fileList.addAll(list); 
    list.clear(); 
    list.addAll(fileList); 
    gridView.setAdapter(imageAdapter); 

    imageButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent intent = new Intent(getContext(), EditVideoActivity.class); 
      intent.putExtra("sendData", imageAdapter.getCheckedItems()); //passing the data 
      Log.e("SEND_DATA", imageAdapter.getCheckedItems().toString()); 
      startActivity(intent); 
     } 
    }); 
}}

由于有大量的数据，我知道由于沉重的数据它没有滚动缓慢。我需要一个解决方案。先谢谢了。

编辑

下面根据解决方案，它仍然没有解决我的问题，这个环节我得到的结果并提出在getView一些变化（）之后。

链接：GridView Smooth Scrolling Solution

我getView（）是现在这个样子：

getView（）我的适配器类的内部方法

@Override 
    public View getView(int position, View convertView, ViewGroup viewGroup) { 


     Viewholder viewHolder = null; 

     if (convertView == null) { 

      viewHolder = new Viewholder(); 

      inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.custom_gridview,viewGroup,false); 
      convertView.setLayoutParams(new AbsListView.LayoutParams(215,215)); 

      convertView.setTag(viewHolder); 

     } else { 
      viewHolder = (Viewholder) convertView.getTag(); 
     } 

     viewHolder.imageView = (ImageView) convertView.findViewById(R.id.galleryImageView); 
     viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.selectCheckBox); 
     viewHolder.id = position; 

     //loading images from the videos 
     if (list.get(position).toString().contains(".jpg")) { 
      bitmap = BitmapFactory.decodeFile(list.get(position).toString()); //Creation of Thumbnail of image 
      // viewHolder.imageView.setImageBitmap(bitmap); 
     } else { 
      if (list.get(position).toString().contains(".mp4")) { 
       bitmap = ThumbnailUtils.createVideoThumbnail(list.get(position).toString(), 1); //Creation of Thumbnail of video 
       viewHolder.imageView.setImageBitmap(bitmap); 
      } 
     } 

     viewHolder.checkBox.setTag(position); 
     viewHolder.checkBox.setChecked(mSparseBooleanArray.get(position)); 
     CompoundButton.OnCheckedChangeListener mCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() { 
      @Override 
      public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) { 
       mSparseBooleanArray.put((Integer) compoundButton.getTag(), isChecked);//Insert selected checkbox value inside boolean array 
       showSelectButton(); 
      } 
     }; 
     viewHolder.checkBox.setOnCheckedChangeListener(mCheckedChangeListener); 

     return convertView; 

    }

来源

2017-08-10 A.Kumar

检查此链接：https://developer.android.com/training/improving-layouts/smooth-scrolling.html。或尝试使用RecycleView –

图像正在加载..异步任务做到了这一点。但加载图像后，它滚动得很慢 –

图像处理是造成缓慢吗？每次调用getView（）时，您都会解码位图或从.mp4创建缩略图。这需要一些时间。可以预先在后台线程上完成，这可能是AsyncTask的一部分？ – Cheticamp

位图可以很容易地排出一个应用程序的内存预算。

如果您的应用程序正在将多个位图加载到内存中，则需要熟练地管理内存和磁盘缓存。因此，无论何时从视频加载图像，它都必须耗尽应用的内存预算。

我建议使用毕加索库。（http://square.github.io/picasso/）

Picasso.with(context).load(new File(YOUR_FILE_PATH)).into(imageView);

你必须改变它的源代码。

if (list.get(position).toString().contains(".mp4")) { 
      bitmap = ThumbnailUtils.createVideoThumbnail(list.get(position).toString(), 1); //Creation of Thumbnail of video 
      Picasso.with(context).load(getImageUri(context, bitmap)).into(viewHolder.imageView);} 

public Uri getImageUri(Context inContext, Bitmap inImage) { 
    ByteArrayOutputStream bytes = new ByteArrayOutputStream(); 
    inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes); 
    String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null); 
    return Uri.parse(path); 
}

也请阅读

solving-the-android-image-loading-problem-volley-vs-picasso/

Handling Bitmaps

来源

2017-08-10 14:29:06 redAllocator

我会尽力告诉你结果 –

我已经做了这个有一些变化，虽然像新的文件（list.get（position ）.toString（））是的，因为它显示无法解析到（android.widget.imageView）**和另一件事情将使用位图的东西**进入不被解析。 –

请再读一遍。我改变了 – redAllocator

视频库不滚动平滑

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