java - Android打开失败: EACCES (Permission denied)

Question

我试图从图库中选择一张图像，当我选择它时，我收到此错误:

open failed: EACCES (Permission denied) 

在 list 中我已经设置了权限:

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

但是我仍然有错误，并且无法在 ImageView 中查看图像。无论如何，这就是代码:

public void loadImagefromGallery() {
        Intent galleryIntent = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(galleryIntent, PICK_IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        try {
            // When an Image is picked
            if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK
                    && null != data) {
                // Get the Image from data

                Uri selectedImage = data.getData();
                String[] filePathColumn = { MediaStore.Images.Media.DATA };

                // Get the cursor
                Cursor cursor = getContentResolver().query(selectedImage,
                        filePathColumn, null, null, null);
                // Move to first row
                cursor.moveToFirst();

                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                imgDecodableString = cursor.getString(columnIndex);
                cursor.close();
                ImageView imgView = (ImageView) findViewById(R.id.firstImg);
                // Set the Image in ImageView after decoding the String
                imgView.setImageBitmap(BitmapFactory.decodeFile(imgDecodableString));

            } else {
                Toast.makeText(this, "You haven't picked Image",
                        Toast.LENGTH_LONG).show();
            }
        } catch (Exception e) {
            Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
                    .show();
        }

    }

其中 loadImagefromGallery() 方法在单击按钮时被调用。我无法理解这个问题..

编辑:

fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int hasWriteContactsPermission = checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
                if (hasWriteContactsPermission != PackageManager.PERMISSION_GRANTED) {
                    requestPermissions(new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE},
                            REQUEST_CODE_ASK_PERMISSIONS);
                    return;
                }
                loadImagefromGallery();

            }
        });

这是我的 onClick() 方法。我添加了权限请求，但仍然收到相同的错误

Answer 1

已解决:我想发布解决问题的方法。这就是我所做的:

private void insertDummyImageWrapper() {
    int hasWriteContactsPermission = checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (hasWriteContactsPermission != PackageManager.PERMISSION_GRANTED) {
        if (!shouldShowRequestPermissionRationale(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            showMessageOKCancel("You need to allow access to SdCard",
                new DialogInterface.OnClickListener() {
            @Override
                public void onClick(DialogInterface dialog, int which) {
                    requestPermissions(new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    REQUEST_CODE_ASK_PERMISSIONS);
                }
            });
            return;
        }
        requestPermissions(new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE},
        REQUEST_CODE_ASK_PERMISSIONS);
        return;
    }
    loadImagefromGallery();
}

private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {
    new AlertDialog.Builder(MainActivity.this)
        .setMessage(message)
        .setPositiveButton("OK", okListener)
        .setNegativeButton("Cancel", null)
        .create()
        .show();
}

在 fab 中我调用了 insertDummyImageWrapper() 方法

fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int hasWriteContactsPermission = checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
                    if (hasWriteContactsPermission != PackageManager.PERMISSION_GRANTED) {
                        requestPermissions(new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE},
                                REQUEST_CODE_ASK_PERMISSIONS);
                        return;
                    }
                    insertDummyImageWrapper();

                }
            });

现在一切正常