公司的一个小伙伴写的，可以按照任意比例裁剪图片。我觉得挺好用的。简单在这里记录一下，以后肯定还会用到。
public class SeniorCropImageView extends ImageView implements ScaleGestureDetector.OnScaleGestureListener, View.OnLayoutChangeListener { /* For drawing color field start */ private static final int LINE_COLOR = Color.WHITE; private static final int OUTER_MASK_COLOR = Color.argb(191, 0, 0, 0); private static final int LINE_WIDTH_IN_DP = 1; private final float[] mMatrixValues = new float[9]; protected Matrix mSupportMatrix; protected ScaleGestureDetector mScaleGestureDetector; /* For drawing color field end */ protected Paint mPaint; /* * 宽比高 */ protected float mRatio = 1.0f; protected RectF mCropRect; //RectFPadding是适应产品需求，给裁剪框mCropRect设置一下padding -- chenglin 2016年04月18日 protected float RectFPadding = 0; protected int mLastX; protected int mLastY; protected OPERATION mOperation; private onBitmapLoadListener iBitmapLoading = null; private boolean mEnableDrawCropWidget = true; /* For scale and drag */ private Matrix mBaseMatrix; private Matrix mDrawMatrix; private AccelerateDecelerateInterpolator sInterpolator = new AccelerateDecelerateInterpolator(); private Path mPath; private int mLineWidth; private float mScaleMax = 3.0f; private RectF mBoundaryRect; private int mRotation = 0; private int mImageWidth; private int mImageHeight; private int mDisplayW; private int mDisplayH; public SeniorCropImageView(Context context) { this(context, null); } public SeniorCropImageView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SeniorCropImageView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); if (attrs != null) { TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Life_CropImage); mRatio = a.getFloat(R.styleable.Life_CropImage_life_Crop_ratio, 1.0f); a.recycle(); } init(); } public static void decodeImageForCropping(final String path, final IDecodeCallback callback) { new Thread(new Runnable() { @Override public void run() { int rotation = 0; // 读取一下exif中的rotation try { ExifInterface exif = new ExifInterface(path); final int rotate = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED); switch (rotate) { case ExifInterface.ORIENTATION_ROTATE_90: rotation = 90; break; case ExifInterface.ORIENTATION_ROTATE_180: rotation = 180; break; case ExifInterface.ORIENTATION_ROTATE_270: rotation = 270; break; } } catch (IOException e) { e.printStackTrace(); } final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(path, options); final int textureLimit = getMaxTextureSize(); int scale = 1; while (options.outWidth / scale >= textureLimit) { scale *= 2; } while (options.outHeight / scale >= textureLimit) { scale *= 2; } options.inSampleSize = scale; options.inJustDecodeBounds = false; Bitmap bitmap = null; try { bitmap = BitmapFactory.decodeFile(path, options); } catch (OutOfMemoryError e) { e.printStackTrace(); } final Bitmap bimapDecoded = bitmap; if (bimapDecoded == null) { return; } if (callback != null) { callback.onDecoded(rotation, bimapDecoded); } } }).start(); } private static int getMaxTextureSize() { EGL10 egl = (EGL10) EGLContext.getEGL(); EGLDisplay display = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); // Initialise int[] version = new int[2]; egl.eglInitialize(display, version); // Query total number of configurations int[] totalConfigurations = new int[1]; egl.eglGetConfigs(display, null, 0, totalConfigurations); // Query actual list configurations EGLConfig[] configurationsList = new EGLConfig[totalConfigurations[0]]; egl.eglGetConfigs(display, configurationsList, totalConfigurations[0], totalConfigurations); int[] textureSize = new int[1]; int maximumTextureSize = 0; // Iterate through all the configurations to located the maximum texture size for (int i = 0; i < totalConfigurations[0]; i++) { // Only need to check for width since opengl textures are always squared egl.eglGetConfigAttrib(display, configurationsList[i], EGL10.EGL_MAX_PBUFFER_WIDTH, textureSize); // Keep track of the maximum texture size if (maximumTextureSize < textureSize[0]) { maximumTextureSize = textureSize[0]; } } // Release egl.eglTerminate(display); return maximumTextureSize; } @Override public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) { mDisplayW = right - left; mDisplayH = bottom - top; if (getDrawable() != null && ((BitmapDrawable) getDrawable()).getBitmap() != null) { calculateProperties(((BitmapDrawable) getDrawable()).getBitmap()); } } private void init() { mScaleGestureDetector = new ScaleGestureDetector(getContext(), this); mBaseMatrix = new Matrix(); mDrawMatrix = new Matrix(); mSupportMatrix = new Matrix(); mLineWidth = (int) dipToPixels(LINE_WIDTH_IN_DP); mPaint = new Paint(); // 表示第一个实线段长dashOnWidth，第一个虚线段长dashOffWidth mPath = new Path(); mCropRect = new RectF(); mBoundaryRect = new RectF(); setScaleType(ScaleType.MATRIX); setClickable(true); } private float dipToPixels(float dip) { return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, getResources().getDisplayMetrics()); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); addOnLayoutChangeListener(this); } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); removeOnLayoutChangeListener(this); } /** * 设置图片的裁剪比例，比如3:4就是0.75 * * @param ratio */ public void setCropRatio(final float ratio) { if (mRatio == ratio) { return; } mRatio = ratio; //重新选择比例后，恢复旋转角度 //setImageRotation(0); if (getDrawable() == null) { return; } calculateProperties(((BitmapDrawable) getDrawable()).getBitmap()); postInvalidate(); } public void setImageRotation(int rotation) { if (mRotation == rotation) { return; } mRotation = rotation; if (getDrawable() == null) { return; } calculateProperties(((BitmapDrawable) getDrawable()).getBitmap()); postInvalidate(); } public void setCropRectPadding(float padding) { RectFPadding = padding; } public void setImagePath(final String path) { if (TextUtils.isEmpty(path)) { return; } if (iBitmapLoading != null) { iBitmapLoading.onLoadPrepare(); } decodeImageForCropping(path, new IDecodeCallback() { @Override public void onDecoded(final int rotation, final Bitmap bitmap) { post(new Runnable() { @Override public void run() { mRotation = rotation; setImageBitmap(bitmap); if (iBitmapLoading != null) { iBitmapLoading.onLoadFinish(); } } }); } }); } @Override public void setImageBitmap(Bitmap bm) { calculateProperties(bm); super.setImageBitmap(bm); } public void setBitmapLoadingListener(onBitmapLoadListener iBitmapLoad) { iBitmapLoading = iBitmapLoad; } protected void calculateProperties(Bitmap bm) { mSupportMatrix.reset(); mBaseMatrix.reset(); int widthSize = mDisplayW; int heightSize = mDisplayH; generateCropRect(widthSize, heightSize); mImageWidth = bm.getWidth(); mImageHeight = bm.getHeight(); final boolean rotated = isImageRotated(); final int bitmapWidth = rotated ? mImageHeight : mImageWidth; final int bitmapHeight = rotated ? mImageWidth : mImageHeight; mBoundaryRect.set(0, 0, bitmapWidth, bitmapHeight); final float widthScale = mCropRect.width() / bitmapWidth; final float heightScale = mCropRect.height() / bitmapHeight; final float scale = Math.max(widthScale, heightScale); final float scaledHeight = scale * bitmapHeight; final float scaledWidth = scale * bitmapWidth; // 移动到中心点 final int translateX = (int) (mCropRect.left + mCropRect.width() / 2 - scaledWidth / 2); final int translateY = (int) (mCropRect.top + mCropRect.height() / 2 - scaledHeight / 2); mBaseMatrix.setScale(scale, scale); mBaseMatrix.postTranslate(translateX, translateY); mBaseMatrix.mapRect(mBoundaryRect); setImageMatrix(getDrawMatrix()); } private boolean isImageRotated() { return ((mRotation % 360) == 90) || ((mRotation % 360) == 270); } private void generateCropRect(int boundaryWidth, int boundaryHeight) { //RectFPadding是适应产品需求，给裁剪框mCropRect设置一下padding -- chenglin 2016年04月18日 boundaryWidth = boundaryWidth - (int)(RectFPadding * 2); boundaryHeight = boundaryHeight - (int)(RectFPadding * 2); int left; int top; int right; int bottom; boolean vertical; // 宽/高 大于比例的话，说明裁剪框是“竖直”的 vertical = (float) boundaryWidth / boundaryHeight > mRatio; final int rectH = (int) (boundaryWidth / mRatio); final int rectW = (int) (boundaryHeight * mRatio); if (vertical) { left = (boundaryWidth - rectW) / 2; top = 0; right = (boundaryWidth + rectW) / 2; bottom = boundaryHeight; } else { left = 0; top = (boundaryHeight - rectH) / 2; right = boundaryWidth; bottom = (boundaryHeight + rectH) / 2; } //RectFPadding是适应产品需求，给裁剪框mCropRect设置一下padding -- chenglin 2016年04月18日 mCropRect.set(left + RectFPadding, top + RectFPadding, right + RectFPadding, bottom + RectFPadding); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (!mEnableDrawCropWidget) { return; } if (getDrawable() == null) { return; } mPaint.reset(); mPaint.setAntiAlias(true); mPaint.setColor(LINE_COLOR); mPaint.setStrokeWidth(mLineWidth); mPaint.setStyle(Paint.Style.STROKE); mPath.reset(); // 上 mPath.moveTo(mCropRect.left, mCropRect.top); mPath.lineTo(mCropRect.right, mCropRect.top); // 左 mPath.moveTo(mCropRect.left, mCropRect.top); mPath.lineTo(mCropRect.left, mCropRect.bottom); // 右 mPath.moveTo(mCropRect.right, mCropRect.top); mPath.lineTo(mCropRect.right, mCropRect.bottom); // 下 mPath.moveTo(mCropRect.right, mCropRect.bottom); mPath.lineTo(mCropRect.left, mCropRect.bottom); canvas.drawPath(mPath, mPaint); // 绘制外部阴影部分 mPaint.reset(); mPaint.setAntiAlias(true); mPaint.setColor(Color.parseColor("#B3333333")); mPaint.setStyle(Paint.Style.FILL); //下面的四个矩形是装饰性的，就是裁剪框四周的四个阴影 final int lineOffset = mLineWidth; if (mCropRect.top > 0) { canvas.drawRect(0, 0, getMeasuredWidth(), mCropRect.top - lineOffset, mPaint); } if (mCropRect.left > 0) { canvas.drawRect(mCropRect.top - lineOffset - RectFPadding, RectFPadding - lineOffset, mCropRect.left - lineOffset, mCropRect.bottom + lineOffset, mPaint); } if (mCropRect.right < getMeasuredWidth()) { canvas.drawRect(mCropRect.right + lineOffset, mCropRect.top - lineOffset, getMeasuredWidth(), mCropRect.bottom + lineOffset, mPaint); } if (mCropRect.bottom < getMeasuredHeight()) { canvas.drawRect(0, mCropRect.bottom + lineOffset, getMeasuredWidth(), getMeasuredHeight(), mPaint); } } public boolean onTouchEvent(MotionEvent ev) { if (ev.getPointerCount() > 1) { mOperation = OPERATION.SCALE; return mScaleGestureDetector.onTouchEvent(ev); } final int action = ev.getActionMasked(); final int x = (int) ev.getX(); final int y = (int) ev.getY(); switch (action) { case MotionEvent.ACTION_DOWN: mOperation = OPERATION.DRAG; mLastX = x; mLastY = y; break; case MotionEvent.ACTION_MOVE: if (mOperation == OPERATION.DRAG) { int deltaX = x - mLastX; int deltaY = y - mLastY; RectF boundary = getDrawBoundary(getDrawMatrix()); if (boundary.left + deltaX > mCropRect.left) { deltaX = (int) (mCropRect.left - boundary.left); } else if (boundary.right + deltaX < mCropRect.right) { deltaX = (int) (mCropRect.right - boundary.right); } if (boundary.top + deltaY > mCropRect.top) { deltaY = (int) (mCropRect.top - boundary.top); } else if (boundary.bottom + deltaY < mCropRect.bottom) { deltaY = (int) (mCropRect.bottom - boundary.bottom); } mSupportMatrix.postTranslate(deltaX, deltaY); setImageMatrix(getDrawMatrix()); mLastX = x; mLastY = y; } break; case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_POINTER_UP: case MotionEvent.ACTION_UP: mLastX = 0; mLastY = 0; mOperation = null; break; } return super.onTouchEvent(ev); } public Bitmap getOriginBitmap() { BitmapDrawable drawable = (BitmapDrawable) getDrawable(); return drawable == null ? null : drawable.getBitmap(); } /** * 保存图片为bitmap */ public Bitmap saveCrop() throws OutOfMemoryError { if (getDrawable() == null) { return null; } Bitmap origin = getOriginBitmap(); Matrix drawMatrix = getDrawMatrix(); // 反转一下矩阵 Matrix inverse = new Matrix(); drawMatrix.invert(inverse); // 把裁剪框对应到原图上去 RectF cropMapped = new RectF(); inverse.mapRect(cropMapped, mCropRect); clampCropRect(cropMapped, origin.getWidth(), origin.getHeight()); // 如果产生了旋转，需要一个旋转矩阵 Matrix rotationM = new Matrix(); if (mRotation % 360 != 0) { rotationM.postRotate(mRotation, origin.getWidth() / 2, origin.getHeight() / 2); } Bitmap cropped = Bitmap.createBitmap( origin, (int) cropMapped.left, (int) cropMapped.top, (int) cropMapped.width(), (int) cropMapped.height(), rotationM, true ); return cropped; } private void clampCropRect(RectF cropRect, int borderW, int borderH) { if (cropRect.left < 0) { cropRect.left = 0; } if (cropRect.top < 0) { cropRect.top = 0; } if (cropRect.right > borderW) { cropRect.right = borderW; } if (cropRect.bottom > borderH) { cropRect.bottom = borderH; } } @Override public boolean onScale(ScaleGestureDetector detector) { float scale = detector.getScaleFactor(); if (scale == 1.0f) { return true; } final float currentScale = getScale(mSupportMatrix); final float centerX = detector.getFocusX(); final float centerY = detector.getFocusY(); if ((currentScale <= 1.0f && scale < 1.0f) || (currentScale >= mScaleMax && scale > 1.0f)) { return true; } if (currentScale * scale < 1.0f) { scale = 1.0f / currentScale; } else if (currentScale * scale > mScaleMax) { scale = mScaleMax / currentScale; } mSupportMatrix.postScale(scale, scale, centerX, centerY); RectF boundary = getDrawBoundary(getDrawMatrix()); float translateX = 0; if (boundary.left > mCropRect.left) { translateX = mCropRect.left - boundary.left; } else if (boundary.right < mCropRect.right) { translateX = mCropRect.right - boundary.right; } Log.d("scale", "x==>" + translateX); float translateY = 0; if (boundary.top > mCropRect.top) { translateY = mCropRect.top - boundary.top; } else if (boundary.bottom < mCropRect.bottom) { translateY = mCropRect.bottom - boundary.bottom; } mSupportMatrix.postTranslate(translateX, translateY); setImageMatrix(getDrawMatrix()); return true; } protected Matrix getDrawMatrix() { mDrawMatrix.reset(); if (mRotation % 360 != 0) { final boolean rotated = isImageRotated(); final int width = rotated ? mImageHeight : mImageWidth; final int height = rotated ? mImageWidth : mImageHeight; mDrawMatrix.postRotate(mRotation, mImageWidth / 2, mImageHeight / 2); if (rotated) { final int translateX = (width - mImageWidth) / 2; final int translateY = (height - mImageHeight) / 2; mDrawMatrix.postTranslate(translateX, translateY); } } mDrawMatrix.postConcat(mBaseMatrix); mDrawMatrix.postConcat(mSupportMatrix); return mDrawMatrix; } @Override public boolean onScaleBegin(ScaleGestureDetector detector) { return true; } @Override public void onScaleEnd(ScaleGestureDetector detector) { final float currentScale = getScale(mSupportMatrix); if (currentScale < 1.0f) { Log.e("onScaleEnd", "currentScale==>" + currentScale); RectF boundary = getDrawBoundary(getDrawMatrix()); post(new AnimatedZoomRunnable(currentScale, 1.0f, boundary.centerX(), boundary.centerY())); } } protected RectF getDrawBoundary(Matrix matrix) { Drawable drawable = getDrawable(); if (drawable == null) { return mBoundaryRect; } final int bitmapWidth = drawable.getIntrinsicWidth(); final int bitmapHeight = drawable.getIntrinsicHeight(); mBoundaryRect.set(0, 0, bitmapWidth, bitmapHeight); matrix.mapRect(mBoundaryRect); return mBoundaryRect; } public float getScale(Matrix matrix) { return (float) Math.sqrt((float) Math.pow(getValue(matrix, Matrix.MSCALE_X), 2) + (float) Math.pow(getValue(matrix, Matrix.MSKEW_Y), 2)); } /** * Helper method that 'unpacks' a Matrix and returns the required value * * @param matrix - Matrix to unpack * @param whichValue - Which value from Matrix.M* to return * @return float - returned value */ private float getValue(Matrix matrix, int whichValue) { matrix.getValues(mMatrixValues); return mMatrixValues[whichValue]; } public void enableDrawCropWidget(boolean enable) { mEnableDrawCropWidget = enable; } protected enum OPERATION { DRAG, SCALE } public enum Type { CENTER_CROP, CENTER_INSIDE } public interface IDecodeCallback { void onDecoded(final int rotation, final Bitmap bitmap); } //setImagePath这个方法耗时，需要显示进度条，这个是监听 public interface onBitmapLoadListener { void onLoadPrepare(); void onLoadFinish(); } private class AnimatedZoomRunnable implements Runnable { private final float mFocalX, mFocalY; private final long mStartTime; private final float mZoomStart, mZoomEnd; public AnimatedZoomRunnable(final float currentZoom, final float targetZoom, final float focalX, final float focalY) { mFocalX = focalX; mFocalY = focalY; mStartTime = System.currentTimeMillis(); mZoomStart = currentZoom; mZoomEnd = targetZoom; } @Override public void run() { float t = interpolate(); float scale = mZoomStart + t * (mZoomEnd - mZoomStart); float deltaScale = scale / getScale(mSupportMatrix); mSupportMatrix.postScale(deltaScale, deltaScale, mFocalX, mFocalY); setImageMatrix(getDrawMatrix()); // We haven't hit our target scale yet, so post ourselves again if (t < 1f) { postOnAnimation(this); } } private float interpolate() { float t = 1f * (System.currentTimeMillis() - mStartTime) / 200; t = Math.min(1f, t); t = sInterpolator.getInterpolation(t); return t; } } } <declare-styleable name="Life_CropImage"> <attr name="life_Crop_ratio" format="float" /> <attr name="life_Crop_scale_type" format="enum"> <enum name="life_center_crop" value="0" /> <enum name="life_center_inside" value="1" /> </attr> </declare-styleable>
1、让这个裁剪框显示图片：
mSeniorImageView.setImagePath(path);
2、保存裁剪后的图片：
Bitmap imageViewBitmap = null; try { imageViewBitmap = mSeniorImageView.saveCrop(); } catch (OutOfMemoryError e) { imageViewBitmap = mSeniorImageView.getOriginBitmap(); PinkToast.makeText(mActivity, R.string.life_image_crop_topbar_crop_error, Toast.LENGTH_LONG).show(); }
3、设置裁剪比例：
mSeniorImageView.setCropRatio(3f / 4f);
4、设置裁剪框的padding：
mSeniorImageView.setCropRectPadding(0f);
5、setImagePath这个方法比较耗时，需要显示进度条，这个是监听：
mSeniorImageView.setBitmapLoadingListener(new SeniorCropImageView.onBitmapLoadListener() { @Override public void onLoadPrepare() { mActivity.showProgress(); } @Override public void onLoadFinish() { mActivity.hideProgress(); } });
以上所述是小编给大家带来的Android 以任意比例裁剪图片代码分享，希望对大家有所帮助
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