我正在为我的应用程序创建更新,其中有一个保存图像的文件夹,我希望在GridView中显示。我已经在使用Ion库。库的创建者(Koush Dutta)已经有一个示例可以做到我想要的,并且在GridView中显示来自SD卡的所有图像。
我想要做的是仅在GridView中显示来自SD卡上特定文件夹(称为漫画)的图像。我直接使用上面示例中的代码,只修改了一些名称。
我的问题是我无法将仅来自SD卡的图像放入GridView中,目前它获取了SD卡上的所有图像。我只想从文件夹/sdcard/Comics/中获取。
代码
public class SavedComics extends Activity {
private MyAdapter mAdapter;
// Adapter to populate and imageview from an url contained in the array adapter
private class MyAdapter extends ArrayAdapter<String> {
public MyAdapter(Context context) {
super(context, 0);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// see if we need to load more to get 40, otherwise populate the adapter
if (position > getCount() - 4)
loadMore();
if (convertView == null)
convertView = getLayoutInflater().inflate(R.layout.image, null);
// find the image view
final ImageView iv = (ImageView) convertView.findViewById(R.id.comic);
// select the image view
Ion.with(iv)
.centerCrop()
.error(R.drawable.error)
.load(getItem(position));
return convertView;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery);
int cols = getResources().getDisplayMetrics().widthPixels / getResources().getDisplayMetrics().densityDpi * 2;
GridView view = (GridView) findViewById(R.id.results);
view.setNumColumns(cols);
mAdapter = new MyAdapter(this);
view.setAdapter(mAdapter);
loadMore();
}
Cursor mediaCursor;
public void loadMore() {
if (mediaCursor == null) {
mediaCursor = getContentResolver().query(MediaStore.Files.getContentUri("external"), null, null, null, null);
}
int loaded = 0;
while (mediaCursor.moveToNext() && loaded < 10) {
// get the media type. ion can show images for both regular images AND video.
int mediaType = mediaCursor.getInt(mediaCursor.getColumnIndex(MediaStore.Files.FileColumns.MEDIA_TYPE));
if (mediaType != MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE
&& mediaType != MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO) {
continue;
}
loaded++;
String uri = mediaCursor.getString(mediaCursor.getColumnIndex(MediaStore.Files.FileColumns.DATA));
File file = new File(uri);
// turn this into a file uri if necessary/possible
if (file.exists())
mAdapter.add(file.toURI().toString());
else
mAdapter.add(uri);
}
}
}
我尝试过几个方法,其中一个是类似于这个答案的东西:
getContentResolver().query(
uri1, Selection,
android.provider.MediaStore.Audio.Media.DATA + " like ? ",
new String[] {str}, null);