在android中从sd卡删除图像
我尝试从sd卡、特定文件夹中选择图像并在我的gridView中成功显示。我有一个问题。在gridView onClickListener中,我想按位置删除此图像。奇怪的情况。文件已在我的文件夹中删除,但gridView仍显示图像在android中从sd卡删除图像,android,android-imageview,android-gridview,Android,Android Imageview,Android Gridview,我尝试从sd卡、特定文件夹中选择图像并在我的gridView中成功显示。我有一个问题。在gridView onClickListener中,我想按位置删除此图像。奇怪的情况。文件已在我的文件夹中删除,但gridView仍显示图像 private void fetchGalleryImages() { Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; final String[] columns =
private void fetchGalleryImages() {
Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
final String[] columns = {MediaStore.Images.Media.DATA, MediaStore.Images.Media.DATE_ADDED};
Cursor imagecursor = getContentResolver().query(mImageUri, columns, MediaStore.Images.Media.DATA + " like ? ", new String[]{"%/Download/New Folder%"}, null);
galleryImageUrls = new ArrayList<>();
for (int i = 0; i < imagecursor.getCount(); i++) {
imagecursor.moveToPosition(i);
int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);//get column index
galleryImageUrls.add(imagecursor.getString(dataColumnIndex));//get Image from column index
Log.e("array path", galleryImageUrls.get(i));
}
}
private void setUpGridView() {
imagesAdapter = new GridView_Adapter(CustomGallery_Activity.this, galleryImageUrls, true);
galleryImagesGridView.setAdapter(imagesAdapter);
galleryImagesGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
File file = new File(galleryImageUrls.get(position));
if (file.exists())
{
file.delete();
imagesAdapter = new GridView_Adapter(CustomGallery_Activity.this, galleryImageUrls, true);
galleryImagesGridView.setAdapter(imagesAdapter);
}
}
});
}
我关闭了应用程序并再次运行,但我有同样的问题。。我想更新我的gridview这是正确的答案。我自己解决了
private void setUpGridView() {
imagesAdapter = new GridView_Adapter(CustomGallery_Activity.this, galleryImageUrls, true);
galleryImagesGridView.setAdapter(imagesAdapter);
galleryImagesGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
File file = new File(galleryImageUrls.get(position));
if (file.exists())
{
file.delete();
deleteFileFromMediaManager(galleryImageUrls.get(position));
galleryImageUrls.remove(position);
imagesAdapter = new GridView_Adapter(CustomGallery_Activity.this, galleryImageUrls, true);
galleryImagesGridView.setAdapter(imagesAdapter);
}
}
});
}
private void deleteFileFromMediaManager(String path) {
try {
MediaScannerConnection.scanFile(CustomGallery_Activity.this, new String[] { path },
null, new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
CustomGallery_Activity.this.getContentResolver()
.delete(uri, null, null);
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
不,这并不奇怪。。。galleryImageUrls保持不变,那么您希望得到什么?@Selvin我添加了这一行galleryImageUrls.removeposition;但当我再次运行我的应用程序时,所有图像仍然显示,因为您没有将其从MediaStore db/contentprovider中删除…@Selvin我有文件管理器应用程序,我检查了我的文件夹,它是空的,但gridview仍显示。。你能给我看看解决方案吗?@Selvin谢谢我自己回答。问题解决了。。。
private void setUpGridView() {
imagesAdapter = new GridView_Adapter(CustomGallery_Activity.this, galleryImageUrls, true);
galleryImagesGridView.setAdapter(imagesAdapter);
galleryImagesGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
File file = new File(galleryImageUrls.get(position));
if (file.exists())
{
file.delete();
deleteFileFromMediaManager(galleryImageUrls.get(position));
galleryImageUrls.remove(position);
imagesAdapter = new GridView_Adapter(CustomGallery_Activity.this, galleryImageUrls, true);
galleryImagesGridView.setAdapter(imagesAdapter);
}
}
});
}
private void deleteFileFromMediaManager(String path) {
try {
MediaScannerConnection.scanFile(CustomGallery_Activity.this, new String[] { path },
null, new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
CustomGallery_Activity.this.getContentResolver()
.delete(uri, null, null);
}
});
} catch (Exception e) {
e.printStackTrace();
}
}