如何裁剪位图里面的片段？

本文介绍了如何裁剪位图里面的片段？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

请帮助解决这个问题...

第一块碎片的在这里，这是一个1stFragment文件发送的字符串连接codeD位图的

TMP = getArguments（）的getString（PHOTO）。      字节[] EN codeByte = Base64.de code（TMP，Base64.DEFAULT）;      BMP = BitmapFactory.de codeByteArray的（EN codeByte，0，EN codeByte.length）;      ByteArrayOutputStream B =新ByteArrayOutputStream（）;      bmp preSS（Bitmap.Com pressFormat.PNG，100，B）;      BM = b.toByteArray（）;      临时= Base64.en codeToString（BM，Base64.DEFAULT）;片段FR =新CropToolActivity（）;                        FM = getFragmentManager（）;                        FragmentTransaction英尺= fm.beginTransaction（）;                        ARGS =新包（）;                        args.putString（PHOTO，温度）;                        fr.setArguments（参数）;                        ft.replace（R.id.frame，FR）;                        ftmit（）;

CropToolActivity 的这儿，这是一个2ndFragment文件接收的字符串连接codeD位图的也设置CropView TI布局的

公开查看onCreateView（LayoutInflater充气器，容器的ViewGroup，            捆绑savedInstanceState）{        查看查看= inflater.inflate（R.layout.croptool，集装箱，FALSE）;        myCropView =（CropView）view.findViewById（R.id.crop_tool）;        myCropView =新CropView（getActivity（）getApplicationContext（））;        TMP = getArguments（）的getString（PHOTO）。        字节[] EN codeByte = Base64.de code（TMP，Base64.DEFAULT）;        BMP = BitmapFactory.de codeByteArray的（EN codeByte，0，EN codeByte.length）;        myCropView.setImageBitmap（BMP）;

croptool.xml 的这是第二个片段布局的XML文件        

＆LT; com.tcss.photostyle.CropView        机器人：layout_width =FILL_PARENT        机器人：layout_height =match_parent        机器人：ID =@ + ID / crop_tool/＆GT;＆LT; / LinearLayout中＆GT;

CropView.Java

的这里，这是一个croptool的Java文件以证明对位图Croptool 的

公共类CropView扩展了ImageView的{涂料粉刷=新的油漆（）;私人INT initial_size = 300;私人静点leftTop，rightBottom，中心，previous;私有静态最终诠释DRAG = 0;私有静态最终诠释LEFT = 1;私有静态最终诠释TOP = 2;私有静态最终诠释RIGHT = 3;私有静态最终诠释BOTTOM = 4;私人诠释imageScaledWidth，imageScaledHeight;//添加父类的构造函数公共CropView（上下文的背景下）{   超级（上下文）;   initCropView（）; } 公共CropView（上下文的背景下，ATTRS的AttributeSet）{   超级（上下文，ATTRS，0）;   initCropView（）; } 公共CropView（上下文的背景下，ATTRS的AttributeSet，诠释defStyle）{  超（背景下，ATTRS，defStyle）;  initCropView（）; } @覆盖 保护无效的onDraw（帆布油画） {   super.onDraw（画布）;   如果（leftTop.equals（0，0））      resetPoints（）;  canvas.drawRect（leftTop.x，leftTop.y，rightBottom.x，rightBottom.y，油漆）;  } @覆盖 公共布尔onTouchEvent（MotionEvent事件）{  INT eventaction = event.getAction（）;  开关（eventaction）{      案例MotionEvent.ACTION_DOWN：          previous.set（（int）的event.getX（），（INT）event.getY（））;          打破;     案例MotionEvent.ACTION_MOVE：         如果（isActionInsideRectangle（event.getX（），event.getY（）））{             adjustRectangle（（int）的event.getX（），（INT）event.getY（））;             无效（）; //重绘矩形             previous.set（（int）的event.getX（），（INT）event.getY（））;         }         打破;     案例MotionEvent.ACTION_UP：         previous =新点（）;         打破; }  返回true; } 私人无效initCropView（）{  paint.setColor（Color.YELLOW）;  paint.setStyle（Style.STROKE）;  paint.setStrokeWidth（5）;  leftTop =新点（）; rightBottom =新点（）; 中心=新点（）; previous =新点（）; }公共无效resetPoints（）{   center.set（的getWidth（）/ 2，的getHeight（）/ 2）;   leftTop.set（（的getWidth（） - initial_size）/ 2，（的getHeight（） - initial_size）/ 2）;   rightBottom.set（leftTop.x + initial_size，leftTop.y + initial_size）; } 私有静态布尔isActionInsideRectangle（浮法X，浮法Y）{  INT缓冲区= 10;  则返回（x＆GT; =（leftTop.x缓冲器）及＆放大器; X＆下; =（rightBottom.x +缓冲）及＆放大器y与其所连接; =（leftTop.y缓冲器）及＆放大器; Y＆下; =（rightBottom。 Y +缓冲））真：假;？ } 私人布尔isInImageRange（点的PointF）{  //获取图像矩阵值，并把它们放在一个数组  浮动[] F =新的浮动[9]; 。getImageMatrix（）的GetValues​​（F）; //计算缩放尺寸  imageScaledWidth = Math.round（getDrawable（）getIntrinsicWidth（）* F [Matrix.MSCALE_X]）;  imageScaledHeight = Math.round（getDrawable（）getIntrinsicHeight（）* F [Matrix.MSCALE_Y]）;  返回(point.x>=(center.x-(imageScaledWidth/2))&&point.x<=(center.x+(imageScaledWidth/2))&&point.y>=(center.y-(imageScaledHeight/2))&&point.y<=(center.y+(imageScaledHeight/2)))?true:false;} 私人无效adjustRectangle（INT X，int y）对{  INT运动;  开关（getAffectedSide（X，Y））{      案例LEFT：         运动= X-leftTop.x;         如果（isInImageRange（新的PointF（leftTop.x +运动，leftTop.y +运动）））            leftTop.set（leftTop.x +运动，leftTop.y +运动）;        打破;      案例TOP：        运动= Y-leftTop.y;        如果（isInImageRange（新的PointF（leftTop.x +运动，leftTop.y +运动）））            leftTop.set（leftTop.x +运动，leftTop.y +运动）;        打破;      案例RIGHT：        运动= X-rightBottom.x;        如果（isInImageRange（新的PointF（rightBottom.x +运动，rightBottom.y +运动）））            rightBottom.set（rightBottom.x +运动，rightBottom.y +运动）;        打破;     案例BOTTOM：        运动= Y-rightBottom.y;        如果（isInImageRange（新的PointF（rightBottom.x +运动，rightBottom.y +运动）））            rightBottom.set（rightBottom.x +运动，rightBottom.y +运动）;        打破;     案例DRAG：        移动= X-previous.x;        INT movementY = Y- previous.y;        如果（isInImageRange（新的PointF（leftTop.x +运动，leftTop.y + movementY））及＆放大器; isInImageRange（新的PointF（rightBottom.x +运动，rightBottom.y + movementY）））{            leftTop.set（leftTop.x +运动，leftTop.y + movementY）;              rightBottom.set（rightBottom.x +运动，rightBottom.y + movementY）;        }        打破;  }}  私有静态诠释getAffectedSide（浮法X，浮法Y）{   INT缓冲区= 10;   如果（X GT; =（leftTop.x缓冲器）及＆放大器; X＆下; =（leftTop.x +缓冲））    返回LEFT;   否则如果（γ＆GT; =（leftTop.y缓冲器）及＆放大器; Y＆下; =（leftTop.y +缓冲））    返回TOP;   否则如果（X GT; =（rightBottom.x缓冲器）及＆放大器; X＆下; =（rightBottom.x +缓冲））    返回的权利;   否则如果（γ＆GT; =（rightBottom.y缓冲器）及＆放大器; Y＆下; =（rightBottom.y +缓冲））    回到BOTTOM;    其他     返回DRAG;   }   公众的byte [] getCroppedImage（）{   BitmapDrawable绘制=（BitmapDrawable）getDrawable（）;   浮X = leftTop.x-center.x +（drawable.getBitmap（）的getWidth（）/ 2）;   浮Y = leftTop.y-center.y +（drawable.getBitmap（）的getHeight（）/ 2）;   位图裁剪= Bitmap.createBitmap(drawable.getBitmap(),(int)x,(int)y,(int)rightBottom.x-(int)leftTop.x,(int)rightBottom.y-(int)leftTop.y); ByteArrayOutputStream流=新ByteArrayOutputStream（）; cropped preSS（Bitmap.Com pressFormat.PNG，100，流）;  返回stream.toByteArray（）;  } }

解决方案

下面是从中心裁剪位图的方法，假设 newWidth＆LT; bitmap.getWidth（）和newHeight＆下; bitmap.getHeight（）

公共位图cropBitmap（位图位图，诠释newWidth，诠释newHeight）{        双X =（bitmap.getWidth（） - newWidth）/ 2;        双Y =（bitmap.getHeight（） - newHeight）/ 2;        位图B = Bitmap.createBitmap（（INT）newWidth，（INT）newHeight，Bitmap.Config.ARGB_8888）;        帆布C =新的Canvas（B）;        c.drawBitmap（位图，新的Rect（（int）的X，（INT）Y，（INT）（X + newWidth），（INT）（Y + newHeight）），新的Rect（0，0，（INT）newWidth， （INT）newHeight），NULL）;        返回b;    }

Please Help to solve this problem...

First Fragment Here this is a 1stFragment file sends the string of encoded bitmap

tmp = getArguments().getString("PHOTO"); byte [] encodeByte=Base64.decode(tmp,Base64.DEFAULT); bmp=BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length); ByteArrayOutputStream b=new ByteArrayOutputStream(); bmppress(Bitmap.CompressFormat.PNG,100, b); bm =b.toByteArray(); temp=Base64.encodeToString(bm, Base64.DEFAULT);Fragment fr = new CropToolActivity(); fm = getFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); args = new Bundle(); args.putString("PHOTO", temp); fr.setArguments(args); ft.replace(R.id.frame,fr); ftmit();

CropToolActivity Here this is a 2ndFragment file receives the string of encoded bitmap also set the CropView ti the layout

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.croptool, container, false); myCropView = (CropView)view.findViewById(R.id.crop_tool); myCropView = new CropView(getActivity().getApplicationContext()); tmp = getArguments().getString("PHOTO"); byte [] encodeByte=Base64.decode(tmp,Base64.DEFAULT); bmp=BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length); myCropView.setImageBitmap(bmp);

croptool.xml This is a XML file for 2nd Fragment layout

<com.tcss.photostyle.CropView android:layout_width="fill_parent" android:layout_height="match_parent" android:id="@+id/crop_tool" /> </LinearLayout>

CropView.Java

Here this is a croptool java file to demonstrate the Croptool on bitmap

public class CropView extends ImageView { Paint paint = new Paint(); private int initial_size = 300; private static Point leftTop, rightBottom, center, previous; private static final int DRAG= 0; private static final int LEFT= 1; private static final int TOP= 2; private static final int RIGHT= 3; private static final int BOTTOM= 4; private int imageScaledWidth,imageScaledHeight; // Adding parent class constructors public CropView(Context context) { super(context); initCropView(); } public CropView(Context context, AttributeSet attrs) { super(context, attrs, 0); initCropView(); } public CropView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initCropView(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if(leftTop.equals(0, 0)) resetPoints(); canvas.drawRect(leftTop.x, leftTop.y, rightBottom.x, rightBottom.y, paint); } @Override public boolean onTouchEvent(MotionEvent event) { int eventaction = event.getAction(); switch (eventaction) { case MotionEvent.ACTION_DOWN: previous.set((int)event.getX(), (int)event.getY()); break; case MotionEvent.ACTION_MOVE: if(isActionInsideRectangle(event.getX(), event.getY())) { adjustRectangle((int)event.getX(), (int)event.getY()); invalidate(); // redraw rectangle previous.set((int)event.getX(), (int)event.getY()); } break; case MotionEvent.ACTION_UP: previous = new Point(); break; } return true; } private void initCropView() { paint.setColor(Color.YELLOW); paint.setStyle(Style.STROKE); paint.setStrokeWidth(5); leftTop = new Point(); rightBottom = new Point(); center = new Point(); previous = new Point(); } public void resetPoints() { center.set(getWidth()/2, getHeight()/2); leftTop.set((getWidth()-initial_size)/2,(getHeight()-initial_size)/2); rightBottom.set(leftTop.x+initial_size, leftTop.y+initial_size); } private static boolean isActionInsideRectangle(float x, float y) { int buffer = 10; return (x>=(leftTop.x-buffer)&&x<=(rightBottom.x+buffer)&& y>=(leftTop.y-buffer)&&y<=(rightBottom.y+buffer))?true:false; } private boolean isInImageRange(PointF point) { // Get image matrix values and place them in an array float[] f = new float[9]; getImageMatrix().getValues(f); // Calculate the scaled dimensions imageScaledWidth = Math.round(getDrawable().getIntrinsicWidth() * f[Matrix.MSCALE_X]); imageScaledHeight = Math.round(getDrawable().getIntrinsicHeight() * f[Matrix.MSCALE_Y]); return (point.x>=(center.x-(imageScaledWidth/2))&&point.x<=(center.x+(imageScaledWidth/2))&&point.y>=(center.y-(imageScaledHeight/2))&&point.y<=(center.y+(imageScaledHeight/2)))?true:false; } private void adjustRectangle(int x, int y) { int movement; switch(getAffectedSide(x,y)) { case LEFT: movement = x-leftTop.x; if(isInImageRange(new PointF(leftTop.x+movement,leftTop.y+movement))) leftTop.set(leftTop.x+movement,leftTop.y+movement); break; case TOP: movement = y-leftTop.y; if(isInImageRange(new PointF(leftTop.x+movement,leftTop.y+movement))) leftTop.set(leftTop.x+movement,leftTop.y+movement); break; case RIGHT: movement = x-rightBottom.x; if(isInImageRange(new PointF(rightBottom.x+movement,rightBottom.y+movement))) rightBottom.set(rightBottom.x+movement,rightBottom.y+movement); break; case BOTTOM: movement = y-rightBottom.y; if(isInImageRange(new PointF(rightBottom.x+movement,rightBottom.y+movement))) rightBottom.set(rightBottom.x+movement,rightBottom.y+movement); break; case DRAG: movement = x-previous.x; int movementY = y-previous.y; if(isInImageRange(new PointF(leftTop.x+movement,leftTop.y+movementY)) && isInImageRange(new PointF(rightBottom.x+movement,rightBottom.y+movementY))) { leftTop.set(leftTop.x+movement,leftTop.y+movementY); rightBottom.set(rightBottom.x+movement,rightBottom.y+movementY); } break; } } private static int getAffectedSide(float x, float y) { int buffer = 10; if(x>=(leftTop.x-buffer)&&x<=(leftTop.x+buffer)) return LEFT; else if(y>=(leftTop.y-buffer)&&y<=(leftTop.y+buffer)) return TOP; else if(x>=(rightBottom.x-buffer)&&x<=(rightBottom.x+buffer)) return RIGHT; else if(y>=(rightBottom.y-buffer)&&y<=(rightBottom.y+buffer)) return BOTTOM; else return DRAG; } public byte[] getCroppedImage() { BitmapDrawable drawable = (BitmapDrawable)getDrawable(); float x = leftTop.x-center.x+(drawable.getBitmap().getWidth()/2); float y = leftTop.y-center.y+(drawable.getBitmap().getHeight()/2); Bitmap cropped = Bitmap.createBitmap(drawable.getBitmap(),(int)x,(int)y,(int)rightBottom.x-(int)leftTop.x,(int)rightBottom.y-(int)leftTop.y); ByteArrayOutputStream stream = new ByteArrayOutputStream(); croppedpress(Bitmap.CompressFormat.PNG, 100, stream); return stream.toByteArray(); } }

解决方案

Here is a method for cropping bitmap from center, assume that newWidth < bitmap.getWidth() and newHeight < bitmap.getHeight()

public Bitmap cropBitmap(Bitmap bitmap, int newWidth, int newHeight) { double x = (bitmap.getWidth() - newWidth) / 2; double y = (bitmap.getHeight() - newHeight) / 2; Bitmap b = Bitmap.createBitmap((int)newWidth, (int)newHeight, Bitmap.Config.ARGB_8888); Canvas c = new Canvas(b); c.drawBitmap(bitmap, new Rect((int)x , (int)y, (int)(x + newWidth), (int)(y + newHeight)), new Rect(0, 0, (int)newWidth, (int)newHeight), null); return b; }