Question

如何使用我的应用程序删除图像文件？

File file = new File("path"); //PATH is: /storage/sdcard0/DCIM/Camera/IMG_20160913_165933.jpg

file.delete(); // try this one but not delete file....
boolean isDelete = file.delete(); //this also not delete...
context.deleteFile(file); // thisn one also not working in my example....

Answer 1

试试这个工作代码

 File target = new File(path);
    Log.d(" target_path", "" + path);
    if (target.exists() && target.isFile() && target.canWrite()) {
        target.delete();
        Log.d("d_file", "" + target.getName());
    }

添加AndroidManifest.xml

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Answer 2

如果您尝试删除图片或类似图片，则可能会遇到问题。可能会返回结果为true，但文件仍然存在。我浪费了太多时间，最适合我的是：

  private void deleteImage(File file) {
        // Set up the projection (we only need the ID)
        String[] projection = {MediaStore.Images.Media._ID};

        // Match on the file path
        String selection = MediaStore.Images.Media.DATA + " = ?";
        String[] selectionArgs = new String[]{file.getAbsolutePath()};

        // Query for the ID of the media matching the file path
        Uri queryUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        ContentResolver contentResolver = getContentResolver();
        Cursor c = contentResolver.query(queryUri, projection, selection, selectionArgs, null);
        if (c.moveToFirst()) {
            // We found the ID. Deleting the item via the content provider will also remove the file
            long id = c.getLong(c.getColumnIndexOrThrow(MediaStore.Images.Media._ID));
            Uri deleteUri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
            contentResolver.delete(deleteUri, null, null);
        } else {
            // File not found in media store DB
        }
        c.close();
    }

Answer 3

检查file.isExist（）然后删除并检查AndroidManifest.xml文件中的权限。

Answer 4

试试这个..

权限也添加到mainfiest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

用于marashmallow运行时权限添加

 private static final int REQUEST_RUNTIME_PERMISSION = 123;

if (CheckPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
// you have permission go ahead
 File file = new File("path");
    if(file.exists())
    {
        file.delete();
    }

} else {
// you do not have permission go request runtime permissions
RequestPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE, REQUEST_RUNTIME_PERMISSION);
}


  @Override
    public void onRequestPermissionsResult(int permsRequestCode, String[] permissions, int[] grantResults) {

        switch (permsRequestCode) {

            case REQUEST_RUNTIME_PERMISSION: {
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                } else {
                    // you do not have permission show toast.
                }
                return;
            }
        }
    }
    public void RequestPermission(Activity thisActivity, String Permission, int Code) {
        if (ContextCompat.checkSelfPermission(thisActivity,
                Permission)
                != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
                    Permission)) {

            } else {
                ActivityCompat.requestPermissions(thisActivity,
                        new String[]{Permission},
                        Code);
            }
        }
    }

    public boolean CheckPermission(Activity context, String Permission) {
        if (ContextCompat.checkSelfPermission(context,
                Permission) == PackageManager.PERMISSION_GRANTED) {
            return true;
        } else {
            return false;
        }
    }

Answer 5

//PATH is: /storage/sdcard0/DCIM/Camera/IMG_20160913_165933.jpg

这似乎是removable storage。在Android 4.4+设备上，您无法在可移动存储上的任意位置读取，写入或删除文件。

以编程方式从设备中删除图像文件

5 个答案: