Android：从 SD 卡中删除图像
我需要从用户选择的 SD 卡中删除图像。 在我的活动中，用户从图库中选择图像后，我执行以下代码：
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Utils.imgUri = data.getData();
Utils.imgPath = getPath(Utils.imgUri);
File file = new File(Utils.imgPath);
boolean deleted = file.delete();
}
}
}
其中 getPath 方法是：
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
if(cursor!=null){
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
else return null;
}
图像已正确删除，但在图库中仍然保留已删除图像的预览。 当我点击它时，会加载一个黑色图像..
那么，在从应用程序代码中删除一些图像后，如何更新图库预览？
I need to remove an image from sd card chosen by user.
In my Activity, after an user select an image from gallery, i execute this code:
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Utils.imgUri = data.getData();
Utils.imgPath = getPath(Utils.imgUri);
File file = new File(Utils.imgPath);
boolean deleted = file.delete();
}
}
}
where getPath method is:
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
if(cursor!=null){
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
else return null;
}
The images are correctly removed but in the gallery still remain a preview of the removed image.
When i tap on it, is loaded a black image..
so, How can I update the gallery previews, after I delete some images from my app code?
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评论（7）
你为什么要把它搞得那么复杂？
你可以像这样简单地做到这一点：
Why would you make it that complex?
You can do it as simple as this:
已解决的添加：
它使 MediaScanner 服务再次运行，这应该从设备的缓存中删除已删除的图像。
同样的问题
Resolved adding:
It makes the MediaScanner service run again, which should remove the deleted image from the device's cache.
same problem here
您是否在清单文件中设置了
Have you set the
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />permission in the manifest file?您确定文件路径正确吗？因为实际删除的方式应该没问题，请参阅此线程：
如何从 SD 卡中删除文件？
应该 / mnt/真的在那里吗？另外，您是否有权从存储中删除文件？ （android.permission.WRITE_EXTERNAL_STORAGE）
Are you sure that the file path is correct? Because the way you do the actual delete should be fine, see this SO thread:
How to delete a file from SD card?
Should the /mnt/ really be there? Also, do you have the permissions to delete files from the storage? (android.permission.WRITE_EXTERNAL_STORAGE)
在参数“data”中，您也有 Uri，只需执行“
data.getUri()”即可。另外，您是否在真实设备中进行测试？如果是这样并且如果是三星，则不起作用（请参阅此in the parameter "data" you have the Uri too, just do "
data.getUri()". Also, are you testing in a real devices? if so and if it is a samsung, it isn't work (see this thread).简单的一行；）
并且在清单中必须使用这些权限
android.permission.WRITE_EXTERNAL_STORAGE
simple one line ;)
and in manifest must use these permissions
android.permission.WRITE_EXTERNAL_STORAGE
在onDestroy方法中添加以下代码：
并且不要忘记在Manifest文件
android.permission.WRITE_EXTERNAL_STORAGE中添加权限add below code in onDestroy method:
and don't forget to add permission in Manifest file
android.permission.WRITE_EXTERNAL_STORAGE