java - 如何从Android中的fragment中获取相机图像

Question

在我的代码中，我在位图上得到 null，但图像创建成功并且 uri 很好，但 BitmapFactory.decodeFile() 返回 null。

我使用了下面的代码 fragment :

public class CameraImage extends Fragment {

private static final int TAKE_PHOTO_CODE = 1888;
Button button;
private Uri fileUri1,fileUri;
ImageView imageView;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    final View rootView = inflater.inflate(R.layout.camera_image,
            container, false);

    button = (Button) rootView.findViewById(R.id.button);
    imageView = (ImageView) rootView.findViewById(R.id.imageview);

    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {

           Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    fileUri1 = getOutputMediaFileUri();
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
    startActivityForResult(cameraIntent, TAKE_PHOTO_CODE);

        }
    });

    return rootView;

}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == TAKE_PHOTO_CODE) {
        if (resultCode == Activity.RESULT_OK) {

           BitmapFactory.Options options;


                try {
                    Bitmap bitmap = BitmapFactory.decodeFile(pathname);
                    showDialog(bitmap, 1);
                } catch (OutOfMemoryError e) {
                    try {
                        options = new BitmapFactory.Options();
                        options.inSampleSize = 2;
                        Bitmap bitmap = BitmapFactory.decodeFile(pathname, options);
                        imageView.setImageBitmap(bitmap);
                    } catch (Exception e2) {
                        Log.e("Camera", "" + e2 + "    " + e);
                    }
                }
        }
    }        
}    }

public Uri getOutputMediaFileUri() {
    return Uri.fromFile(getOutputMediaFile());
}

private static File getOutputMediaFile() {

    File mediaStorageDir = new File(
            Environment
                    .getExternalStoragePublicDirectory(MyApplication.getAppContext().getFilesDir().getAbsolutePath()),
            IMAGE_DIRECTORY_NAME);

    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
                    + IMAGE_DIRECTORY_NAME + " directory");
            return null;
        }
    }
    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());
    File mediaFile;

    try {
        mediaFile = File.createTempFile(
                "IMG_" + timeStamp,  
                ".jpg",         
                mediaStorageDir      
        );
    } catch (Exception e) {
        Log.e("Camera", "" + e);
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                , "IMG_" + timeStamp + ".jpg");
    }
    return mediaFile;
}

在上面的代码中，我在 onActivityResult 中的位图上得到 null，但我从该图像中得到了 uri，该位置存在。

Answer 1

我们可以通过相机获取两种类型的图像:

1) 在 onActivityResult 中使用以下代码生成缩略图:

Bitmap photo = (Bitmap) data.getExtras().get("data");
                Log.i(TAG, "" + photo + "  /  " + data.getExtras().get("data") + "  / " + data.getData());
                showDialog(photo, 1);

2) 通过在 onActivityResult 中使用以下代码获得完整质量的图像:

BitmapFactory.Options options;
                options = new BitmapFactory.Options();
                options.inSampleSize = 2;
                Bitmap bitmap = BitmapFactory.decodeFile(pathname, options);
                showDialog(bitmap, 1);

3)使用第三方轻松舒适:

编译“com.mindorks:paracamera:0.2.2”

paracamera github