选定的图像内容正确的路径，但光标为空

Question

我正在尝试显示相机刚刚拍摄的照片并将其显示在 imageView 中。这是有问题的方法：

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 100 && resultCode == RESULT_OK) {

        selectedImage = fileUri;//data.getData();

        String[] filePathColumn = {MediaStore.Images.Media.DATA};

        Cursor cursor =  getContentResolver().query(selectedImage,filePathColumn, null, null, null);
        //managedQuery(selectedImage,filePathColumn, null, null, null);//
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        picturePath = cursor.getString(columnIndex);
        cursor.close();

        // The following three lines work perfectly :-) 
        // if I comment the part of the cursor lines above
        Bitmap photo = (Bitmap) data.getExtras().get("data");
        ImageView imageView = (ImageView) findViewById(R.id.Imageprev);
        imageView.setImageBitmap(photo);
    }
}

调试时我会看到一些值，例如

selectedImage : file:///mnt/sdcard/external_sd/Pictures/MyCameraApp/IMG_20150530_032752.jpg

我认为这没问题。另一个有趣的值是

filePathColumn : _data

这个值是预期值吗？请你告诉我。

所以，光标为空而行

cursor.moveToFirst();

吐出错误空指针：-/。我正在使用 Android 2.2 在真实设备中调试代码。帮助。

版本

这是调用前一个的方法

private void clickpic() {

    // Check Camera
        if (getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {

            // Open default camera
            Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            /*
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

            // start the image capture Intent
            startActivityForResult(intent, 100);
            */

            fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create

            //the getOutputMediaFileUri is implemented as saving media file suggests by developer.android.com
            //intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, fileUri); // set the image file

            // start the image capture Intent
            startActivityForResult(intent,100);

        } else {
            Toast.makeText(MainActivity.this, "Camera not supported", Toast.LENGTH_LONG).show();
        }
    }

注释代码是我失败的尝试。

Answer 1

您需要将fileUri 作为额外的，如此处所示Android Developers

fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name

并尝试将您的 onActivityResult 替换为：

if (requestCode == 100 && resultCode == RESULT_OK) {

    selectedImage = fileUri;

    Bitmap photo = BitmapFactory.decodeFile(new File(selectedImage));
    ImageView imageView = (ImageView) findViewById(R.id.Imageprev);
    imageView.setImageBitmap(photo);
}