Question

我一直试图创建多个图像选择器，一切正常，但网格滚动非常懒惰和慢，我已尝试在getView() (Picasso,aquery..)中使用不同的库进行图像加载但即使用asynctask，我的代码也没有区别：主：

public class Media extends ActionBarActivity {
    private AQuery aq;

    GridView myGridView;
    MyAdapter mySimpleCursorAdapter;    
    boolean isOddClicked = true;
    static String img=null;
    final Uri srcUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
    final String srcData  = MediaStore.Images.Media.DATA;
    final String srcImgId = MediaStore.Images.Media._ID;    
    final Uri thumbUri = MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI;
    final String thumb_DATA = MediaStore.Images.Thumbnails.DATA;
    final String thumb_IMAGE_ID = MediaStore.Images.Thumbnails.IMAGE_ID;
    ArrayList<String> al = new ArrayList<String>(5);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.media);


        //Always show the menu
        try {
            ViewConfiguration config = ViewConfiguration.get(this);
            Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");
            if(menuKeyField != null) {
                menuKeyField.setAccessible(true);
                menuKeyField.setBoolean(config, false);
            } 
        } catch (Exception ex) {}
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true); 
        myGridView = (GridView)findViewById(R.id.gridview);        
        // 
        CursorLoader cursorLoader = new CursorLoader(
          this,srcUri,null,null,null,MediaStore.Images.Media.DATE_TAKEN+ " DESC");
        //
        Cursor cursor = cursorLoader.loadInBackground();
        //
        int[] to = {android.R.id.text1};
        String[] from = {MediaStore.MediaColumns.TITLE};
        mySimpleCursorAdapter = new MyAdapter(
          this,android.R.layout.simple_list_item_1, 
            cursor,from,to,CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        //
        myGridView.setAdapter(mySimpleCursorAdapter);
        myGridView.setOnItemClickListener(myOnItemClickListener);
    }    

    OnItemClickListener myOnItemClickListener = new OnItemClickListener(){
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
            Cursor cursor = mySimpleCursorAdapter.getCursor();
            cursor.moveToPosition(position);
            int int_ID = cursor.getInt(cursor.getColumnIndex(MediaStore.Images.Media._ID));
        }
    };

    private Bitmap getThumbnail(int id){
        String[] thumbColumns = {srcData, srcImgId};
        CursorLoader thumbCursorLoader = new CursorLoader(
      this,srcUri,thumbColumns,srcImgId + "=" + id,null,null);        
    Cursor thumbCursor = thumbCursorLoader.loadInBackground();
    Bitmap thumbBitmap = null;
    if(thumbCursor.moveToFirst()){
            int thCulumnIndex = thumbCursor.getColumnIndex(srcData);
            String thumbPath = thumbCursor.getString(thCulumnIndex);
            Toast.makeText(getApplicationContext(),thumbPath,Toast.LENGTH_LONG).show();         
            thumbBitmap = BitmapFactory.decodeFile(thumbPath);          
          //Create a Dialog to display the thumbnail
            AlertDialog.Builder thumbDialog = new AlertDialog.Builder(Media.this);
            ImageView thumbView = new ImageView(Media.this);
            thumbView.setImageBitmap(thumbBitmap);
            LinearLayout layout = new LinearLayout(Media.this);
      layout.setOrientation(LinearLayout.VERTICAL);
      layout.addView(thumbView);
      thumbDialog.setView(layout);
      thumbDialog.show();           
        }else{
            Toast.makeText(getApplicationContext(),"NO Thumbnail!",Toast.LENGTH_LONG).show();
        }
    return thumbBitmap;
    }
    public class MyAdapter extends SimpleCursorAdapter{
    Cursor myCursor;
      Context myContext;
        public MyAdapter(Context context, int layout, Cursor c, String[] from,int[] to, int flags) {
            super(context, layout, c, from, to, flags);         
            myCursor = c;
          myContext = context;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            final ViewHolder holder;
            if (convertView == null) {
                LayoutInflater inflater=getLayoutInflater();
                convertView =inflater.inflate(R.layout.media_row, parent, false);   
             holder = new ViewHolder();
            holder.thumbnail = (ImageView)convertView.findViewById(R.id.thumb);
            holder.title = (CheckBox) convertView.findViewById(R.id.itemCheckBox);  
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
            myCursor.moveToPosition(position);
            final int myID = myCursor.getInt(myCursor.getColumnIndex(MediaStore.Images.Media._ID));
            final String[] thumbColumns = {srcData ,srcImgId};
            CursorLoader thumbCursorLoader = new CursorLoader(
              myContext,srcUri,thumbColumns,srcImgId + "=" + myID,null,null);
            Cursor thumbCursor = thumbCursorLoader.loadInBackground();          
        if(thumbCursor.moveToFirst()){
          final int thCulumnIndex = thumbCursor.getColumnIndex(thumb_DATA);
              final String thumbPath = thumbCursor.getString(thCulumnIndex);
                Bitmap o = MediaStore.Images.Thumbnails.getThumbnail(getApplicationContext().getContentResolver(), myID, Images.Thumbnails.MICRO_KIND, null);
                //holder.thumbnail.setImageBitmap(o);
            //Phase II:
                String uri = null;
                Cursor cursor = MediaStore.Images.Thumbnails.queryMiniThumbnail(
          getContentResolver(), myID,
          MediaStore.Images.Thumbnails.MINI_KIND,null );
                if( cursor != null && cursor.getCount() > 0 ) {
                  cursor.moveToFirst();//**EDIT**
                  uri = cursor.getString( cursor.getColumnIndex( MediaStore.Images.Thumbnails.DATA ) );
                }

                MediaAsync loadAsync = new MediaAsync(getApplicationContext(), holder.thumbnail);
                loadAsync.onPostExecute(thumbPath);
                /*
                holder.thumbnail.setOnClickListener(new OnClickListener(){
          public void onClick(View v){
            img = thumbPath;
            al.add(thumbPath); 
            if (holder.title.isChecked()) {
              holder.title.setChecked(false);
              holder.thumbnail.setBackgroundResource(0);
            }else{
              holder.title.setChecked(true);
              holder.thumbnail.setBackgroundResource(R.drawable.media_row_border);
            }
          }
       });
       */
            }           
            return convertView ;
        }

    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.media, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == android.R.id.home) {
            finish();
        }
        else if (id == R.id.done) {
            Intent main = new Intent(this, Main.class);
            main.putStringArrayListExtra("media_lst", al);
            startActivity(main);
        }
        return super.onOptionsItemSelected(item);
    }
    private static class ViewHolder {
        ImageView thumbnail;
        CheckBox title;
    }
}

mediaAsynce：

public class MediaAsync extends AsyncTask<String,String, String>{
    private ImageView mImageView;
    private Context mContext;

    public  MediaAsync(Context context,ImageView imageView) {
        mImageView = imageView;
        mContext   = context;
    }

    @Override
    protected String doInBackground(String... params) {
        String url = params[0].toString();
        return url;
    }

    @Override
    protected void onPostExecute(String result) {
        Uri uri = Uri.fromFile(new File(result));

        Picasso.with(mContext)
        .load(uri)
        //.resize(100, mWidth)
        .into(mImageView);
        //  AQuery aq = new AQuery(mContext);
        //  aq.id(mImageView).image(result,  true, true, 0, R.drawable.ic_launcher);

    }
}

Answer 1

正如你所说，你已经尝试了毕加索图书馆，它应该有用

再次尝试使用picassso，就像这个Async任务一样，并且不是必需的

只需创建一个简单的适配器并加载图像。

public class GridViewDynamicAdapter extends BaseDynamicGridAdapter {
ImageDetails details;
public static List<ImageDetails> list;

public GridViewDynamicAdapter(Context context, List<ImageDetails> items,
        int columnCount) {
    super(context, items, columnCount);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    CheeseViewHolder holder;
    if (convertView == null) {
        convertView = LayoutInflater.from(getContext()).inflate(
                R.layout.item_grid, null);
        holder = new CheeseViewHolder(convertView);
        convertView.setTag(holder);
    } else {
        holder = (CheeseViewHolder) convertView.getTag();
    }
    if (position == getCount() - 1) {
        ImageApplication.fromRecorderPaths = (List<ImageDetails>) getItems();
    }
    details = (ImageDetails) getItem(position);
    // Log.d("Setting=", details.path);
    holder.build(getContext(), details.path);
    return convertView;
}

private class CheeseViewHolder {
    private ImageView image;

    private CheeseViewHolder(View view) {
        image = (ImageView) view.findViewById(R.id.item_img);
    }

    void build(final Context context, String title) {
        Picasso.with(context).load(new File(title)).centerCrop()
                .resize(150, 150).error(R.drawable.ic_launcher).into(image);
    }
}

}

或

Try this example

缓慢加载从SD卡到gridview的图像

1 个答案: