カメラ2のプレビューのアスペクト比を変更するにはどうすればよいですか？

Question

私はCamera2プレビューのアスペクト比を変更しようとするが、私は、私はSCALER_CROP_REGIONを使用する必要がありますが、私はそれが動作しませんクロップについて:-(

失敗。

Iからandroid-Camera2Video例を使用。私のテストのためのGoogleのopenCamera方法で

は、私は次の行を追加：

mSensorSize = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE); 

そしてで3210私はこれを追加しました：

final int centerX = mSensorSize.width()/2; 
final int centerY = mSensorSize.height()/2; 
final int cropSize = Math.min(mSensorSize.width(), mSensorSize.height()); 
final Rect crop = new Rect(centerY - cropSize/2, 
          centerX - cropSize/2, 
          cropSize, 
          cropSize); 
mPreviewBuilder.set(CaptureRequest.SCALER_CROP_REGION, crop); 

を私は1でプレビューを取得する必要があります：1の比率が、3：私が間違っていた何

:-(4？

Answer 1

あなたは

public class AutoFitTextureView extends TextureView { 

    int maxwidth = 0; 
    int maxheight = 0; 
    private int mRatioWidth = 0; 
    private int mRatioHeight = 0; 
    private Size previewSize; 

    public AutoFitTextureView(Context context) { 
     this(context, null); 
    } 

    public AutoFitTextureView(Context context, AttributeSet attrs) { 
     this(context, attrs, 0); 
    } 

    public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) { 
     super(context, attrs, defStyle); 
    } 

    public void setAspectRatio(int width, int height, int maxwidth, int maxheight, Size preview) { 
     if (width < 0 || height < 0) { 
      throw new IllegalArgumentException("Size cannot be negative."); 
     } 
     mRatioWidth = width; 
     mRatioHeight = height; 
     this.maxwidth = maxwidth; 
     this.maxheight = maxheight; 
     this.previewSize = preview; 
     enterTheMatrix(); 
     requestLayout(); 
    } 



    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     super.onMeasure(widthMeasureSpec, heightMeasureSpec); 

     int width = MeasureSpec.getSize(widthMeasureSpec); 
     int height = MeasureSpec.getSize(heightMeasureSpec); 
     boolean isFullBleed = true; 
     if (0 == mRatioWidth || 0 == mRatioHeight) { 
      setMeasuredDimension(width, height); 
     } else { 
      setMeasuredDimension(height * mRatioWidth/mRatioHeight,height); 
     } 

    } 


    private void adjustAspectRatio(int previewWidth, 
            int previewHeight, 
            int rotation) { 
     Matrix txform = new Matrix(); 
     int viewWidth = getWidth(); 
     int viewHeight = getHeight(); 
     RectF rectView = new RectF(0, 0, viewWidth, viewHeight); 
     float viewCenterX = rectView.centerX(); 
     float viewCenterY = rectView.centerY(); 
     RectF rectPreview = new RectF(0, 0, previewHeight, previewWidth); 
     float previewCenterX = rectPreview.centerX(); 
     float previewCenterY = rectPreview.centerY(); 

     if (Surface.ROTATION_90 == rotation || 
       Surface.ROTATION_270 == rotation) { 
      rectPreview.offset(viewCenterX - previewCenterX, 
        viewCenterY - previewCenterY); 

      txform.setRectToRect(rectView, rectPreview, 
        Matrix.ScaleToFit.FILL); 

      float scale = Math.max((float) viewHeight/previewHeight, 
        (float) viewWidth/previewWidth); 

      txform.postScale(scale, scale, viewCenterX, viewCenterY); 
      txform.postRotate(90 * (rotation - 2), viewCenterX, 
        viewCenterY); 
     } else { 
      if (Surface.ROTATION_180 == rotation) { 
       txform.postRotate(180, viewCenterX, viewCenterY); 
      } 
     } 

     if (LollipopCamera.type == 1) { 
      txform.postScale(-1, 1, viewCenterX, viewCenterY); 
     } 

     setTransform(txform); 
    } 

    private void enterTheMatrix() { 
     if (previewSize != null) { 
      adjustAspectRatio(mRatioWidth, 
        mRatioHeight, 
        ((Activity) getContext()).getWindowManager().getDefaultDisplay().getRotation()); 
     } 
    } 
} 

あなたAutofitTextureViewクラス内onMeasure方法を変更しようとすることがあり、これは方法

の上に適用する前に、これは方法
Camera2Video google sample

の上に塗布した後にされ、私はまた、2つの行を削除したfragment_camera2_video.xml

android:layout_below="@id/texture" 
    android:background="#4285f4" 

mPreviewSize = chooseOptimalSize(map.getOutputSizes(ImageFormat.JPEG), 
         rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth, 
         maxPreviewHeight, largest); 

       // We fit the aspect ratio of TextureView to the size of preview we picked. 
       int orientation = getResources().getConfiguration().orientation; 
       if (orientation == Configuration.ORIENTATION_LANDSCAPE) { 
        mTextureView.setAspectRatio(
          mPreviewSize.getWidth(), mPreviewSize.getHeight(), universal_width, universal_height, largest); 
       } else { 
        mTextureView.setAspectRatio(
          mPreviewSize.getHeight(), mPreviewSize.getWidth(), universal_width, universal_height, largest); 
       }