Android以任意比例裁剪图片代码分享

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  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  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.top) { 
deltaY = (int) (mCropRect.top - boundary.top); 
} else if (boundary.bottom + deltaY  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 " + translateX); 
float translateY = 0; 
if (boundary.top > mCropRect.top) { 
translateY = mCropRect.top - boundary.top; 
} else if (boundary.bottom " + 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; 
} 
} 
} 
 
 
 
 
 
 

mSeniorImageView.setImagePath(path);

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(); 
}

mSeniorImageView.setCropRatio(3f / 4f);

mSeniorImageView.setCropRectPadding(0f);

mSeniorImageView.setBitmapLoadingListener(new SeniorCropImageView.onBitmapLoadListener() { 
@Override 
public void onLoadPrepare() { 
mActivity.showProgress(); 
} 
@Override 
public void onLoadFinish() { 
mActivity.hideProgress(); 
} 
});