图片剪裁优化，设置图片剪裁宽高比。

Author: teach

app/src/main/java/com/donkingliang/imageselectdemo/MainActivity.java

@@ -86,6 +86,7 @@ public void onClick(View v) {
                 ImageSelector.builder()
                         .useCamera(true) // 设置是否使用拍照
                         .setCrop(true)  // 设置是否使用图片剪切功能。
+                        .setCropRatio(1.0f) // 图片剪切的宽高比,默认1.0f。宽固定为手机屏幕的宽。
                         .setSingle(true)  //设置是否单选
                         .canPreview(true) //是否点击放大图片查看,，默认为true
                         .start(this, REQUEST_CODE); // 打开相册
@@ -102,6 +103,7 @@ public void onClick(View v) {
                 //拍照并剪裁
                 ImageSelector.builder()
                         .setCrop(true) // 设置是否使用图片剪切功能。
+                        .setCropRatio(1.0f) // 图片剪切的宽高比,默认1.0f。宽固定为手机屏幕的宽。
                         .onlyTakePhoto(true)  // 仅拍照，不打开相册
                         .start(this, REQUEST_CODE);
                 break;

imageselector/src/main/java/com/donkingliang/imageselector/ClipImageActivity.java

@@ -31,6 +31,7 @@ public class ClipImageActivity extends Activity {
     private ClipImageView imageView;
     private int mRequestCode;
     private boolean isCameraImage;
+    private float cropRatio;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -43,6 +44,7 @@ protected void onCreate(Bundle savedInstanceState) {
         mRequestCode = config.requestCode;
         config.isSingle = true;
         config.maxSelectCount = 0;
+        cropRatio = config.cropRatio;
         setStatusBarColor();
         ImageSelectorActivity.openActivity(this, mRequestCode, config);
         initView();
@@ -79,6 +81,8 @@ public void onClick(View v) {
                 finish();
             }
         });
+
+        imageView.setRatio(cropRatio);
     }
 
     @Override

imageselector/src/main/java/com/donkingliang/imageselector/entry/RequestConfig.java

@@ -19,8 +19,10 @@ public class RequestConfig implements Parcelable {
     public boolean canPreview = true; // 是否可以点击图片预览
     public int maxSelectCount; //图片的最大选择数量，小于等于0时，不限数量，isSingle为false时才有用。
     public ArrayList<String> selected; //接收从外面传进来的已选择的图片列表。当用户原来已经有选择过图片，重新打开选择器，允许用户把先前选过的图片传进来，并把这些图片默认为选中状态。
+    public float cropRatio = 1.0f; // 图片剪切的宽高比，宽固定为手机屏幕的宽。
     public int requestCode;
 
+
     @Override
     public int describeContents() {
         return 0;
@@ -35,6 +37,7 @@ public void writeToParcel(Parcel dest, int flags) {
         dest.writeByte(this.canPreview ? (byte) 1 : (byte) 0);
         dest.writeInt(this.maxSelectCount);
         dest.writeStringList(this.selected);
+        dest.writeFloat(this.cropRatio);
         dest.writeInt(this.requestCode);
     }
 
@@ -49,6 +52,7 @@ protected RequestConfig(Parcel in) {
         this.canPreview = in.readByte() != 0;
         this.maxSelectCount = in.readInt();
         this.selected = in.createStringArrayList();
+        this.cropRatio = in.readFloat();
         this.requestCode = in.readInt();
     }
 

imageselector/src/main/java/com/donkingliang/imageselector/utils/ImageSelector.java

@@ -64,6 +64,17 @@ public ImageSelectorBuilder setCrop(boolean isCrop) {
             return this;
         }
 
+        /**
+         *
+         * 图片剪切的宽高比，宽固定为手机屏幕的宽。
+         * @param ratio
+         * @return
+         */
+        public ImageSelectorBuilder setCropRatio(float ratio){
+            config.cropRatio = ratio;
+            return this;
+        }
+
         /**
          * 是否单选
          *

imageselector/src/main/java/com/donkingliang/imageselector/view/ClipImageView.java

@@ -19,7 +19,6 @@
 import android.view.WindowManager;
 
 public class ClipImageView extends AppCompatImageView {
-
     private PointF mDownPoint;
     private PointF mMiddlePoint;
     private Matrix mMatrix;
@@ -46,6 +45,7 @@ public class ClipImageView extends AppCompatImageView {
     private float mCircleCenterX, mCircleCenterY;
     private float mCircleX, mCircleY;
     private boolean isCutImage;
+    private float mRatio = 1.0f;
 
     public ClipImageView(Context context) {
         super(context);
@@ -95,23 +95,23 @@ public void run() {
     @Override
     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
         super.onLayout(changed, left, top, right, bottom);
+        setRadius();
+    }
+
+    private void setRadius() {
+        mTargetWidth = getScreenWidth(getContext());
+        mTargetHeight = (int) (mTargetWidth * mRatio);
         mCircleCenterX = getWidth() / 2;
         mCircleCenterY = getHeight() / 2;
         mCircleX = mCircleCenterX - mTargetWidth / 2;
         mCircleY = mCircleCenterY - mTargetHeight / 2;
     }
 
-    private void setRadius() {
-
-        int width = getScreenWidth(getContext());
-        int height = getScreenHeight(getContext());
-
-        if (width > height) {
-            mTargetWidth = height;
-            mTargetHeight = height;
-        } else {
-            mTargetWidth = width;
-            mTargetHeight = width;
+    public void setRatio(float ratio) {
+        if (mRatio != ratio) {
+            mRatio = ratio;
+            setRadius();
+            invalidate();
         }
     }
 
@@ -126,14 +126,17 @@ protected void onDraw(Canvas canvas) {
             rf = new RectF(r);
         }
         // 画入前景圆形蒙板层
-        int sc = canvas.saveLayer(rf, null,  Canvas.ALL_SAVE_FLAG);
+        int sc = canvas.saveLayer(rf, null, Canvas.ALL_SAVE_FLAG);
         //画入矩形黑色半透明蒙板层
         canvas.drawRect(r, mFrontGroundPaint);
         //设置Xfermode，目的是为了去除矩形黑色半透明蒙板层和圆形的相交部分
         mFrontGroundPaint.setXfermode(mXfermode);
         //画入正方形
-        canvas.drawRect(mCircleCenterX - mTargetWidth / 2, mCircleCenterY - mTargetHeight / 2,
-                mCircleCenterX + mTargetWidth / 2, mCircleCenterY + mTargetHeight / 2, mFrontGroundPaint);
+        float left = mCircleCenterX - mTargetWidth / 2;
+        float top = mCircleCenterY - mTargetHeight / 2;
+        float right = mCircleCenterX + mTargetWidth / 2;
+        float bottom = mCircleCenterY + mTargetHeight / 2;
+        canvas.drawRect(left, top, right, bottom, mFrontGroundPaint);
 
         canvas.restoreToCount(sc);
         //清除Xfermode，防止影响下次画图
@@ -153,10 +156,11 @@ public Bitmap clipImage() {
         Bitmap targetBitmap = Bitmap.createBitmap(mTargetWidth, mTargetHeight,
                 Bitmap.Config.ARGB_8888);
         Canvas canvas = new Canvas(targetBitmap);
-        RectF dst = new RectF(-bitmap.getWidth() / 2 + mTargetWidth / 2, -getHeight()
-                / 2 + mTargetHeight / 2, bitmap.getWidth() / 2
-                + mTargetWidth / 2, getHeight() / 2 + mTargetHeight / 2);
-
+        int left = -bitmap.getWidth() / 2 + mTargetWidth / 2;
+        int top = -getHeight() / 2 + mTargetHeight / 2;
+        int right = bitmap.getWidth() / 2 + mTargetWidth / 2;
+        int bottom = getHeight() / 2 + mTargetHeight / 2;
+        RectF dst = new RectF(left, top, right, bottom);
         canvas.drawBitmap(bitmap, null, dst, paint);
         setDrawingCacheEnabled(false);
         bitmap.recycle();
@@ -300,33 +304,12 @@ private void midPoint(PointF point, MotionEvent event) {
      * 横向、纵向居中
      */
     protected void center() {
-
         float height = mBitmapHeight;
         float width = mBitmapWidth;
-        float screenWidth = getWidth();
-        float screenHeight = getHeight();
-        float scale = 1f;
-        if (width >= height) {
-            scale = screenWidth / width;
-
-            if (scale * height < mTargetHeight) {
-                scale = mTargetHeight / height;
-            }
-
-        } else {
-            if (height <= screenHeight) {
-                scale = screenWidth / width;
-            } else {
-                scale = screenHeight / height;
-            }
+        float scale = Math.max(mTargetWidth / width,mTargetHeight / height);
 
-            if (scale * width < mTargetWidth) {
-                scale = mTargetWidth / width;
-            }
-        }
-
-        float deltaX = (screenWidth - width * scale) / 2f;
-        float deltaY = (screenHeight - height * scale) / 2f;
+        float deltaX = -(width * scale - getWidth()) / 2.0f;
+        float deltaY = -(height * scale - getHeight()) / 2.0f;
         mMatrix.postScale(scale, scale);
         mMatrix.postTranslate(deltaX, deltaY);
         setImageMatrix(mMatrix);
@@ -351,4 +334,5 @@ public static int getScreenHeight(Context context) {
         wm.getDefaultDisplay().getMetrics(outMetrics);
         return outMetrics.heightPixels;
     }
+
 }