FitWidth ImageView: 宽度自适应

public class FitWidthImageView extends ImageView  {           public FitWidthImageView(Context context) {          super(context);          setup();      }           public FitWidthImageView(Context context, AttributeSet attrs) {          super(context, attrs);          setup();      }           public FitWidthImageView(Context context, AttributeSet attrs, int defStyle) {          super(context, attrs, defStyle);          setup();      }           @Override      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {          int width = MeasureSpec.getSize(widthMeasureSpec);          int height = width * getDrawable().getIntrinsicHeight() / getDrawable().getIntrinsicWidth();          setMeasuredDimension(width, height);      }           private void setup() {          setScaleType(ScaleType.CENTER_CROP);      }    }

TopCrop ImageView : 从头部Crop而不是center

自己改名

public class FitWidthImageView extends ImageView  {           public FitWidthImageView(Context context) {          super(context);          setup();      }           public FitWidthImageView(Context context, AttributeSet attrs) {          super(context, attrs);          setup();      }           public FitWidthImageView(Context context, AttributeSet attrs, int defStyle) {          super(context, attrs, defStyle);          setup();      }           private void setup() {          setScaleType(ScaleType.CENTER_CROP);          setScaleType(ScaleType.MATRIX);      }           @Override      protected boolean setFrame(int frameLeft, int frameTop, int frameRight, int frameBottom) {          float frameWidth = frameRight - frameLeft;          float frameHeight = frameBottom - frameTop;                   float originalImageWidth = (float) getDrawable().getIntrinsicWidth();          float originalImageHeight = (float) getDrawable().getIntrinsicHeight();                   float usedScaleFactor = 1;                   if ((frameWidth > originalImageWidth) || (frameHeight > originalImageHeight)) {              // If frame is bigger than image              // => Crop it, keep aspect ratio and position it at the bottom and center horizontally                           float fitHorizontallyScaleFactor = frameWidth / originalImageWidth;              float fitVerticallyScaleFactor = frameHeight / originalImageHeight;                           usedScaleFactor = Math.max(fitHorizontallyScaleFactor, fitVerticallyScaleFactor);          }                   float newImageWidth = originalImageWidth * usedScaleFactor;          float newImageHeight = originalImageHeight * usedScaleFactor;                   Matrix matrix = getImageMatrix();          matrix.setScale(usedScaleFactor, usedScaleFactor, 0, 0); // Replaces the old matrix completly          // matrix.postTranslate((frameWidth - newImageWidth) / 2, frameHeight - newImageHeight);//BottomCrop          matrix.postTranslate((frameWidth - newImageWidth) / 2, 0);//Top Crop          setImageMatrix(matrix);          return super.setFrame(frameLeft, frameTop, frameRight, frameBottom);      }  }