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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