android:删除图像 [英] android : deleting an image

问题描述

我正在从我的应用程序中删除一个图像文件.我在做

I am deleting an image file from my application. I was doing

new  File(filename).delete ();

这实际上是删除文件.但图片在图库中仍然可见.

This was actually deleting the file. But the image was still visible in the gallery.

在搜索中我发现我们应该使用

On search i found that we should use

getContentResolver().delete(Uri.fromFile(file), null,null); 删除

但在这里我得到了例外:

But here i am getting the exception:

未知的文件 URL.java.lang.IllegalArgumentException: 未知 URLfile:///mnt/sdcard/DCIM/Camera/IMG_20120523_122612.jpg

Unknown file URL. java.lang.IllegalArgumentException: Unknown URL file:///mnt/sdcard/DCIM/Camera/IMG_20120523_122612.jpg

当我使用任何文件浏览器查看时，会出现此特定图像.请帮我解决这个问题.当图像被物理删除时，有没有其他方法可以更新图库

When i see with any file browser, this particular image is present. Please help me to fix this issue. Is there any other way to update gallery when image is physically deleted

推荐答案

使用下面的代码，它可能对你有帮助.

Use the code below, it may help you.

File fdelete = new File(file_dj_path);
if (fdelete.exists()) {
    if (fdelete.delete()) {
        System.out.println("file Deleted :" + file_dj_path);
    } else {
        System.out.println("file not Deleted :" + file_dj_path);
    }
}

<小时>

删除图像后刷新图库使用下面的代码发送广播

(对于 < KITKAT API 14)

(for < KITKAT API 14)

 sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
 Uri.parse("file://" +  Environment.getExternalStorageDirectory())));

对于 >= KITKAT API 14 使用下面的代码

For >= KITKAT API 14 use below code

MediaScannerConnection.scanFile(this, new String[] { Environment.getExternalStorageDirectory().toString() }, null, new MediaScannerConnection.OnScanCompletedListener() {
            /*
             *   (non-Javadoc)
             * @see android.media.MediaScannerConnection.OnScanCompletedListener#onScanCompleted(java.lang.String, android.net.Uri)
             */
            public void onScanCompleted(String path, Uri uri) 
              {
                  Log.i("ExternalStorage", "Scanned " + path + ":");
                  Log.i("ExternalStorage", "-> uri=" + uri);
              }
            });

因为:

ACTION_MEDIA_MOUNTED

在 KITKAT(API 14) 中已弃用.

is deprecated in KITKAT(API 14).

已于 2015 年 4 月 9 日编辑

它的工作正常检查下面的代码

its working fine check below code

public void deleteImage() {
        String file_dj_path = Environment.getExternalStorageDirectory() + "/ECP_Screenshots/abc.jpg";
        File fdelete = new File(file_dj_path);
        if (fdelete.exists()) {
            if (fdelete.delete()) {
                Log.e("-->", "file Deleted :" + file_dj_path);
                callBroadCast();
            } else {
                Log.e("-->", "file not Deleted :" + file_dj_path);
            }
        }
    }

    public void callBroadCast() {
        if (Build.VERSION.SDK_INT >= 14) {
            Log.e("-->", " >= 14");
            MediaScannerConnection.scanFile(this, new String[]{Environment.getExternalStorageDirectory().toString()}, null, new MediaScannerConnection.OnScanCompletedListener() {
                /*
                 *   (non-Javadoc)
                 * @see android.media.MediaScannerConnection.OnScanCompletedListener#onScanCompleted(java.lang.String, android.net.Uri)
                 */
                public void onScanCompleted(String path, Uri uri) {
                    Log.e("ExternalStorage", "Scanned " + path + ":");
                    Log.e("ExternalStorage", "-> uri=" + uri);
                }
            });
        } else {
            Log.e("-->", " < 14");
            sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
                    Uri.parse("file://" + Environment.getExternalStorageDirectory())));
        }
    }

下面是日志

09-04 14:27:11.085    8290-8290/com.example.sampleforwear E/-->﹕ file Deleted :/storage/emulated/0/ECP_Screenshots/abc.jpg
09-04 14:27:11.085    8290-8290/com.example.sampleforwear E/-->﹕ >= 14
09-04 14:27:11.152    8290-8290/com.example.sampleforwear E/﹕ appName=com.example.sampleforwear, acAppName=/system/bin/surfaceflinger
09-04 14:27:11.152    8290-8290/com.example.sampleforwear E/﹕ 0
09-04 14:27:15.249    8290-8302/com.example.sampleforwear E/ExternalStorage﹕ Scanned /storage/emulated/0:
09-04 14:27:15.249    8290-8302/com.example.sampleforwear E/ExternalStorage﹕ -> uri=content://media/external/file/2416

这篇关于android:删除图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！