Question

我有一个活动，我希望用户按下视图并拍摄几个地方的照片然后插入每个“按下”的地方。像照片文件夹一样。

所以我创建了一个类来处理拍照和制作位图。

但是我无法弄清楚如何在我需要它的活动中解码位图，我只是得到一个静态无法从非静态错误中引用，因为我没有正确地实例化它我想。

继承我的方法：

            case R.id.pButton2:
                new CameraActivity();
                Bitmap bitmap = BitmapFactory.decodeStream(CameraActivity.openFileInput("myImage"));
                mImageView = (ImageView)findViewById(R.id.imageView2);
                mImageView.setImageBitmap(bitmap);
                mImageView.setRotation(180);
                mImageView.setVisibility(View.VISIBLE);
                break;

致电此课程：

public class CameraActivity extends Activity{
    private String mCurrentPhotoPath;
    private ImageView mImageView;
    private Bitmap mImageBitmap;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        dispatchTakePictureIntent();
    }
    public void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // Ensure that there's a camera activity to handle the intent
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            // Create the File where the photo should go
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException ex) {
                // Error occurred while creating the File
                System.out.println("ERR CANNOT CREATE FILE");
            }
            // Continue only if the File was successfully created
            if (photoFile != null) {
                Uri photoURI = FileProvider.getUriForFile(this,
                        "com.example.android.fileprovider",
                        photoFile);
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
            }
        }
    }
    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);

        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );

        // Save a file: path for use with ACTION_VIEW intents
        mCurrentPhotoPath = "file:" + image.getAbsolutePath();
        return image;
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            try {
                mImageBitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(mCurrentPhotoPath));
                createImageFromBitmap(mImageBitmap);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    public String createImageFromBitmap(Bitmap bitmap) {
        String fileName = "myImage";//no .png or .jpg needed
        try {
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
            FileOutputStream fo = openFileOutput(fileName, Context.MODE_PRIVATE);
            fo.write(bytes.toByteArray());
            // remember close file output
            fo.close();
        } catch (Exception e) {
            e.printStackTrace();
            fileName = null;
        }
        return fileName;
    }
}

我正在使用这个样本; how do you pass images (bitmaps) between android activities using bundles?

Answer 1

删除sudo service motion restart。

最有可能的是，您可以替换：

new CameraActivity()

使用：

Bitmap bitmap = BitmapFactory.decodeStream(CameraActivity.openFileInput("myImage"));

因为此Bitmap bitmap = BitmapFactory.decodeStream(openFileInput("myImage"));似乎是UI代码，因此可能已经在活动中。如果它在片段中，请使用case。如果它在其他地方使用getActivity().openFileInput()。

是否有适当的方法来实例化在BitmapFactory解码流中使用的活动？

1 个答案: