Question

当物体（任何文件）完全占据相机边界内的相机视图时，从相机获取照片。实际上我已经创建了自定义相机，我希望在照片完全进入相机边界时获得任何对象图片。我已经在xml部分内设置了相机边界。这是我的代码，请检查并纠正我的问题。

public class MainActivity extends ActionBarActivity {

    private ImageSurfaceView mImageSurfaceView;
    private Camera camera;
    public static FrameLayout cameraPreviewLayout;
    private ImageView capturedImageHolder;
    String TAG = "MainActivity";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        cameraPreviewLayout = (FrameLayout) findViewById(R.id.camera_preview);
        camera = checkDeviceCamera();
        mImageSurfaceView = new ImageSurfaceView(MainActivity.this, camera);
        cameraPreviewLayout.addView(mImageSurfaceView);




        Button captureButton = (Button) findViewById(R.id.button);
        captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                camera.takePicture(null, null, pictureCallback);


            }
        });
    }

    private Camera checkDeviceCamera() {
        Camera mCamera = null;
        try {
            mCamera = Camera.open();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return mCamera;
    }

    PictureCallback pictureCallback = new PictureCallback() {
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {

            File pictureFile = getOutputMediaFile();
            if (pictureFile == null) {
                return;
            }
            try {
                FileOutputStream fos = new FileOutputStream(pictureFile);
                fos.write(data);
                fos.close();;
            } catch (FileNotFoundException e) {

            } catch (IOException e) {
            }
        }
    };


    private static File getOutputMediaFile() {
        File mediaStorageDir = new File(
                Environment
                        .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                "MyCameraApp");
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                Log.d("MyCameraApp", "failed to create directory");
                return null;
            }
        }
        // Create a media file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
                .format(new Date());
        File mediaFile;
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");

        Log.e("mediaFile",""+mediaFile.length());

        return mediaFile;
    }


}

这是xml文件。

    <FrameLayout
        android:id="@+id/camera_preview"
        android:layout_width="400dp"
        android:layout_height="320dp"
        android:background="@drawable/camera_backround"
        android:padding="10dp"
        android:layout_margin="10dp"
        >

    </FrameLayout>

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/capture_button"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
      />



</RelativeLayout>

这是我的SurfaceView类。

public class ImageSurfaceView extends SurfaceView implements SurfaceHolder.Callback,Camera.PictureCallback, Camera.PreviewCallback {

    private Camera camera;
    private SurfaceHolder surfaceHolder;
    Context context;
    private boolean mFocused;
    private boolean imageProcessorBusy=true;
    private int width;
    private int height;
    public void setImageProcessorBusy(boolean imageProcessorBusy) {
        this.imageProcessorBusy = imageProcessorBusy;
    }


    public ImageSurfaceView(Context context, Camera camera) {
        super(context);
        this.camera = camera;
        this.surfaceHolder = getHolder();
        this.surfaceHolder.addCallback(this);
        this.surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        this.context=context;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        camera.setDisplayOrientation(90);
        try {
            this.camera.setPreviewDisplay(holder);
            this.camera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        refreshCamera();
        Log.e("camera", "surfaceChanged");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

            Log.e("camera","surfaceDestroyed");
            this.camera.stopPreview();
            this.camera.setPreviewCallback(null);
            this.camera.release();
            this.camera = null;

    }

    private void refreshCamera() {
        try {
            Log.e("camera", "refreshCamera");
            camera.stopPreview();
        } catch (Exception e) {
        }
        try {
            Log.e("camera", "refreshCamera----2");
            camera.setPreviewDisplay(surfaceHolder);
            camera.startPreview();
            camera.setPreviewCallback(this);
        } catch (Exception e) {


        }
    }


    @Override
    public void onPictureTaken(byte[] bytes, Camera camera) {
        android.hardware.Camera.Size pictureSize = camera.getParameters().getPictureSize();

        Log.d("Check", "onPictureTaken - received image " + pictureSize.width + "x" + pictureSize.height);
    }

    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {

        android.hardware.Camera.Size pictureSize = camera.getParameters().getPreviewSize();
        // layout in the activity that the cameraView will placed in
        int layoutWidth = MainActivity.cameraPreviewLayout.getWidth();
        int layoutHeight = MainActivity.cameraPreviewLayout.getHeight();
        Log.e("layoutWidth","------"+layoutWidth);
        Log.e("layoutHeight", "---------" + layoutHeight);
        Log.d("onPreviewFrame", "onPreviewFrame - received image " + pictureSize.width + "x" + pictureSize.height
                + " focused: "+ mFocused +" imageprocessor: "+(imageProcessorBusy?"busy":"available"));
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width = MeasureSpec.getSize(widthMeasureSpec);
        height = width;
        setMeasuredDimension(width, width);

    }


}

Answer 1

您可以使用意图从相机捕获图像数据，试试这个

private static final int TAKE_PICTURE = 1000;    
private Uri imageUri;

点击按钮

Button captureButton = (Button) findViewById(R.id.button);
        captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                takePhoto();   

            }
        });

public void takePhoto() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    File photo = new File(Environment.getExternalStorageDirectory(),  "Pic.jpg");
    intent.putExtra(MediaStore.EXTRA_OUTPUT,
            Uri.fromFile(photo));
    imageUri = Uri.fromFile(photo);
    startActivityForResult(intent, TAKE_PICTURE);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {
    case TAKE_PICTURE:
        if (resultCode == Activity.RESULT_OK) {
            Uri selectedImage = imageUri;
            getContentResolver().notifyChange(selectedImage, null);
            ImageView imageView = (ImageView) findViewById(R.id.ImageView);
            ContentResolver cr = getContentResolver();
            Bitmap bitmap;
            try {
                 bitmap = android.provider.MediaStore.Images.Media
                 .getBitmap(cr, selectedImage);

                imageView.setImageBitmap(bitmap);
                Toast.makeText(this, selectedImage.toString(),
                        Toast.LENGTH_LONG).show();
            } catch (Exception e) {
                Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT)
                        .show();
                Log.e("Camera", e.toString());
            }
        }
    }
}

你的xml代码

<ImageView
    android:id="@+id/Imageview"
    android:layout_width="400dp"
    android:layout_height="320dp"
    android:background="@drawable/camera_backround"
    android:padding="10dp"
    android:layout_margin="10dp"
    />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/capture_button"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
  />

注意：如果您打算拍多张图片，请在文件名中添加时间戳。

从相机获取图片

1 个答案: