我一直在尝试创建多个图像选择器，一切正常，但网格滚动非常懒惰和缓慢，我已经尝试使用不同的库在getView() (Picasso,aquery..)中加载图像，但它没有区别，即使使用asynctask，这是我的代码：主要：
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);
}
}
正如你所说，你已经尝试过毕加索图书馆，它应该有效
只需再次尝试使用picassso，就像这个Async任务一样，并不需要
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);
}
}
}
要么