【发布时间】：2016-07-13 09:03:11
【问题描述】：
从其路径中删除图像时出现问题。从应用程序以及从图库中删除它真的很困惑 我在从图像查看热删除图像以从活动以及文件位置的外部媒体中删除它时遇到问题。
尝试了 3 天，但尚未找到解决方案。我需要在这个 java 文件中应用删除按钮代码
public class FullScreenViewActivity extends Activity {
private Utils utils;
private FullScreenImageAdapter adapter, image;
private ViewPager viewPager;
Button btnClose, btnShare, btnDelete;
private static Context mContext;
ContentResolver contentResolver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fullscreen_view);
viewPager = (ViewPager) findViewById(R.id.pager);
utils = new Utils(getApplicationContext());
Intent i = getIntent();
int position = i.getIntExtra("position", 0);
adapter = new FullScreenImageAdapter(FullScreenViewActivity.this,
utils.getFilePaths());
viewPager.setAdapter(adapter);
// displaying selected image first
viewPager.setCurrentItem(position);
btnClose = (Button) findViewById(R.id.btnClose);
btnShare = (Button) findViewById(R.id.btnshare0);
btnDelete = (Button) findViewById(R.id.btndelete);
btnClose.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
finish();
}
});
btnShare.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
File file = new File(adapter._imagePaths.get(viewPager
.getCurrentItem()));
Intent mShareIntent = new Intent(Intent.ACTION_SEND);
mShareIntent.setType("image/*");
mShareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
startActivity(Intent.createChooser(mShareIntent, "Shareith:"));
}
});
btnDelete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case DialogInterface.BUTTON_POSITIVE:
deleteTmpFile(viewPager.getCurrentItem());
break;
case DialogInterface.BUTTON_NEGATIVE:
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setMessage("Delete this Photo?")
.setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
}
});
}
public void deleteTmpFile(int pos) {
//String Foldername = mContext.getResources()
// .getString(R.string.app_name);
/*
* String filepath = Environment.getExternalStorageDirectory().getPath()
* + "/" + Foldername + "/" +data.get(pos) ;
*/
File f = new File(adapter._imagePaths.get(viewPager
.getCurrentItem()));
//File f = new File(filepath);
if (f.exists()) {
f.delete();
deleteFileFromMediaStore(mContext.getContentResolver(), f);
// final Uri uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
// mContext.getContentResolver().delete(uri,
// MediaStore.MediaColumns.DATA + " =?",
// new String[] { filepath });
notifyAll();
}
Toast.makeText(mContext, "Delete Successfully..", Toast.LENGTH_SHORT)
.show();
}
public static void deleteFileFromMediaStore(
final ContentResolver contentResolver, final File file) {
String canonicalPath;
try {
canonicalPath = file.getCanonicalPath();
} catch (IOException e) {
canonicalPath = file.getAbsolutePath();
}
final Uri uri = MediaStore.Files.getContentUri("external");
final int result = contentResolver.delete(uri,
MediaStore.Files.FileColumns.DATA + "=?",
new String[] { canonicalPath });
if (result == 0) {
final String absolutePath = file.getAbsolutePath();
if (!absolutePath.equals(canonicalPath)) {
contentResolver.delete(uri, MediaStore.Files.FileColumns.DATA
+ "=?", new String[] { absolutePath });
}
}
}
}
【问题讨论】：
-
那么什么不起作用？什么有效？
-
当我点击删除按钮然后应用程序崩溃
-
在这种情况下，您可以在 LogCat 中找到原因。请在此处发布相关部分。您必须找到导致此问题的代码行。然后告诉我们。
-
我解决了这个问题，但是现在当我按下返回按钮时，图像又出现了，但它被删除了，但又显示回来了..为什么？
-
说出问题所在并发布修改后的代码。
标签： android image delete-file