Android实现图片的裁剪(不调用系统功能)

cutP.setOnClickListener(new View.OnClickListener() {     public void onClick(View v) {     //将一些按钮隐藏     cutP.setVisibility(View.INVISIBLE);     mTopBarSwitcher.setVisibility(View.INVISIBLE);     mPageSlider.setVisibility(View.INVISIBLE);     back.setVisibility(View.INVISIBLE);     mPageNumberView.setVisibility(View.INVISIBLE);     View view = MuPDFActivity.this.getWindow().getDecorView();     if (false == view.isDrawingCacheEnabled()) {      view.setDrawingCacheEnabled(true);     }     Bitmap bitmap = view.getDrawingCache();     ImageView imgv = new ImageView(MuPDFActivity.this);     imgv.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,       LayoutParams.FILL_PARENT-200));     imgv.setImageBitmap(bitmap);     backBitmap = bitmap;     //传递给另一个Activity进行裁剪     Intent intent = new Intent();     intent.setClass(MuPDFActivity.this, CutActivity.class);     startActivity(intent);     }       }); 

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  >  <com.artifex.mupdf.Crop_Canvas   android:id="@+id/myCanvas"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   android:background="#313131"   />  <Button   android:id="@+id/cutCancel"   android:layout_height="wrap_content"   android:layout_width="wrap_content"   android:text="取消"   android:layout_alignParentBottom="true"   android:layout_alignParentLeft="true"/>  <Button   android:id="@+id/cutEnsure"   android:layout_height="wrap_content"   android:layout_width="wrap_content"   android:text="确定"   android:layout_alignParentBottom="true"   android:layout_centerInParent="true"/>  <Button   android:id="@+id/toPDF"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="ToPDF"   android:layout_alignParentBottom="true"   android:layout_alignParentRight="true"/> </RelativeLayout> 

package com.artifex.mupdf;  import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Bitmap.Config; import android.graphics.drawable.BitmapDrawable; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.ImageView;  public class Crop_Canvas extends ImageView {   private final static int PRESS_LB = 0;//表示左下角矩形框  private final static int PRESS_LT = 1;//表示左上角矩形框  private final static int PRESS_RB = 2;//表示右下角矩形框  private final static int PRESS_RT = 3;//表示右上角矩形框   private Bitmap bitMap = null;    //原始图片  private RectF src = null;     //经过比例转换后的裁剪区域  private RectF dst = null;     //图片显示区域，也就是drawBitmap函数中的目标dst  private RectF ChooseArea = null;    //选择区域     private Paint mPaint = null;    //画笔  private Matrix matrix = null;    //矩阵    private int mx = 0;       //存储触笔移动时，之前�?��的触笔的x坐标  private int my = 0;       //存储触笔移动时，之前�?��的触笔的y坐标  private boolean touchFlag = false;   //触笔是否在屏幕之�?  private boolean cutFlag = false;   //是否点击了menu上的裁剪按钮  private int recFlag = -1;     //用来存储触笔点击了哪个小矩形框（改变选择区域大小的小矩形框）  private boolean firstFlag = false;    private RectF recLT = null;     //左上角的小矩形框  private RectF recRT = null;     //右上角的小矩形框  private RectF recLB = null;     //左下角的小矩形框  private RectF recRB = null;     //右下角的小矩形框  private static final int LEFT_AREA_ALPHA = 50 * 255 / 100;  private RectF leftRectL = null;  private RectF leftRectR = null;  private RectF leftRectT = null;  private RectF leftRectB = null;  private Paint leftAreaPaint = null;    public Crop_Canvas(Context context, AttributeSet attrs) {   super(context, attrs);   this.init();  }    public Crop_Canvas(Context context) {   super(context);   this.init();  }    public void init(){   cutFlag = true;   recLT = new RectF();   recLB = new RectF();   recRT = new RectF();   recRB = new RectF();   dst = new RectF();   mPaint = new Paint();   mPaint.setColor(Color.RED);   mPaint.setStyle(Paint.Style.STROKE);  //将画笔的风格改为空心   ChooseArea = new RectF();   this.setPressRecLoc();   src = null;   firstFlag = true;      //选择框之外的灰色区域，分成四个矩形框      leftAreaPaint = new Paint();   leftAreaPaint.setStyle(Paint.Style.FILL);   leftAreaPaint.setAlpha(Crop_Canvas.LEFT_AREA_ALPHA);  }    public void setBitmap(Bitmap bitmap){   BitmapDrawable bd = new BitmapDrawable(bitmap);   src = new RectF(0,0,bd.getIntrinsicWidth(),bd.getIntrinsicHeight());   this.bitMap = bitmap.copy(Config.ARGB_8888, true);      this.setImageBitmap(bitMap);   leftRectB = new RectF();   leftRectL = new RectF();   leftRectR = new RectF();   leftRectT = new RectF();  }    public void imageScale(){   matrix = this.getImageMatrix();   matrix.mapRect(dst, src);   int padding = this.getPaddingBottom();   int width = bitMap.getWidth();   int height = bitMap.getHeight();   //dst.set(dst.left+padding,dst.top+padding,dst.right+padding,dst.bottom+padding);   dst.set(dst.left+20,dst.top+20,width-20,height - 40);   ChooseArea = new RectF(dst);   this.setPressRecLoc();  }    public Bitmap getSubsetBitmap(){   float ratioWidth = bitMap.getWidth()/(float)(dst.right-dst.left);   float ratioHeight = bitMap.getHeight()/(float)(dst.bottom - dst.top);   int left = (int)((ChooseArea.left - dst.left) * ratioWidth);   int right = (int)(left + (ChooseArea.right - ChooseArea.left) * ratioWidth);   int top = (int)((ChooseArea.top - dst.top) * ratioHeight);   int bottom = (int)(top + (ChooseArea.bottom - ChooseArea.top) * ratioHeight);   src = new RectF(left,top,right,bottom);   firstFlag = true;   set_LeftArea_Alpha();   return Bitmap.createBitmap(bitMap, left, top, right-left, bottom-top);  }    //获得ChooseArea对象  public RectF getChooseArea(){   return ChooseArea;  }    public void moveChooseArea(int move_x,int move_y){   if(ChooseArea.left + move_x >= dst.left && ChooseArea.right + move_x <= dst.right   && ChooseArea.top + move_y >= dst.top && ChooseArea.bottom + move_y <= dst.bottom){    ChooseArea.set(ChooseArea.left + move_x,ChooseArea.top+move_y      ,ChooseArea.right + move_x,ChooseArea.bottom+move_y);   }else{    if(ChooseArea.left + move_x < dst.left){     ChooseArea.set(dst.left,ChooseArea.top       ,ChooseArea.right+dst.left-ChooseArea.left,ChooseArea.bottom);    }    if(ChooseArea.right + move_x > dst.right){     ChooseArea.set(ChooseArea.left+dst.right-ChooseArea.right,ChooseArea.top       ,dst.right,ChooseArea.bottom);    }        if(ChooseArea.top + move_y < dst.top){     ChooseArea.set(ChooseArea.left,dst.top       ,ChooseArea.right,ChooseArea.bottom+dst.top-ChooseArea.top);    }        if(ChooseArea.bottom + move_y > dst.bottom){     ChooseArea.set(ChooseArea.left,ChooseArea.top+dst.bottom-ChooseArea.bottom       ,ChooseArea.right,dst.bottom);    }   }   this.setPressRecLoc();   mPaint.setColor(Color.GREEN);   this.invalidate();  }    public boolean onTouchEvent(MotionEvent event){   mPaint.setColor(Color.RED);         if(event.getAction() == MotionEvent.ACTION_DOWN && cutFlag){    //System.out.println(event.getX() + "," + event.getY());        mx = (int)event.getX();    my = (int)event.getY();    if(this.judgeLocation(mx,my)){     touchFlag = true;     mPaint.setColor(Color.GREEN);     this.invalidate();     return true;    }else{         if(this.findPresseddst((int)event.getX(), (int)event.getY())){      touchFlag = true;      mPaint.setColor(Color.RED);      return true;     }    }   }      if(event.getAction() == MotionEvent.ACTION_MOVE && touchFlag){    //判断是否点击了哪个个小矩形框    if(this.isOutOfArea((int)event.getX(), (int)event.getY())){     return true;    }        //如果选择区域大小跟图像大小一样时，就不能移动    if(ChooseArea.left == dst.left && ChooseArea.top == dst.top &&     ChooseArea.right == dst.right && ChooseArea.bottom == dst.bottom){    }else{     this.moveChooseArea((int)event.getX() - mx, (int)event.getY() - my);     mx = (int)event.getX();     my = (int)event.getY();    }   }         if(event.getAction() == MotionEvent.ACTION_UP){    recFlag = -1;    this.invalidate();    touchFlag = false;   }      return super.onTouchEvent(event);  }          private boolean isOutOfArea(int x,int y){   switch(recFlag){   case Crop_Canvas.PRESS_LB:    this.pressLB(x - mx, y - my);    break;   case Crop_Canvas.PRESS_LT:    this.pressLT(x - mx, y - my);    break;   case Crop_Canvas.PRESS_RB:    this.pressRB(x - mx, y - my);    break;   case Crop_Canvas.PRESS_RT:    this.pressRT(x - mx, y - my);    break;   default:return false;   }   mx = x;   my = y;   this.invalidate();   return true;  }    public boolean findPresseddst(int x,int y){   boolean returnFlag = false;   if(this.isInRect(x, y, recLB)){    recFlag = Crop_Canvas.PRESS_LB;    returnFlag = true;   }else if(this.isInRect(x, y, recLT)){    recFlag = Crop_Canvas.PRESS_LT;    returnFlag = true;   }else if(this.isInRect(x, y, recRB)){    recFlag = Crop_Canvas.PRESS_RB;    returnFlag = true;   }else if(this.isInRect(x, y, recRT)){    recFlag = Crop_Canvas.PRESS_RT;    returnFlag = true;   }      return returnFlag;  }    public boolean isInRect(int x,int y,RectF rect){   if(x >= rect.left -20 && x <= rect.right + 20 && y > rect.top - 20 && y < rect.bottom + 20){    return true;   }   return false;  }    private void pressLB(int x,int y){   float left = ChooseArea.left + x;   float right = ChooseArea.right;   float top = ChooseArea.top;   float bottom = ChooseArea.bottom + y;   if(left <= right - 30 && left >= dst.left && bottom <= dst.bottom && bottom >= top + 30){     ChooseArea.set(left,top,right,bottom);   }else{    if(left + x < dst.left){     left = dst.left;    }        if(bottom + y > dst.bottom){     bottom = dst.bottom;    }        if(ChooseArea.left + x > ChooseArea.right - 30){     left = ChooseArea.right - 30;    }        if(ChooseArea.bottom + y < ChooseArea.top + 30){     bottom = ChooseArea.top + 30;    }    ChooseArea.set(left,top,right,bottom);   }   this.setPressRecLoc();  }      private void pressLT(int x,int y){   float left = ChooseArea.left + x;   float right = ChooseArea.right;   float top = ChooseArea.top + y;   float bottom = ChooseArea.bottom;   if(left <= right - 30 && left >= dst.left && top <= bottom - 30 && top >= dst.top){    ChooseArea.set(left,top,right,bottom);   }else{    if(left < dst.left){     left = dst.left;    }        if(top < dst.top){     top = dst.top;    }        if(left > right - 30){     left = right - 30;    }        if(top > bottom - 30){     top = bottom - 30;    }    ChooseArea.set(left,top,right,bottom);   }   this.setPressRecLoc();  }      private void pressRT(int x,int y){   float left = ChooseArea.left;   float right = ChooseArea.right + x;   float top = ChooseArea.top + y;   float bottom = ChooseArea.bottom;      if(right <= dst.right && right >= left + 30 && top <= bottom - 30 && top >= dst.top){    ChooseArea.set(left,top,right,bottom);   }else{    if(right > dst.right){     right = dst.right;    }        if(top < dst.top){     top = dst.top;    }        if(right < left + 30){     right = left + 30;    }        if(top > bottom - 30){     top = bottom - 30;    }    ChooseArea.set(left,top,right,bottom);   }   this.setPressRecLoc();  }      private void pressRB(int x,int y){   float left = ChooseArea.left;   float right = ChooseArea.right + x;   float top = ChooseArea.top;   float bottom = ChooseArea.bottom + y;      if(right<= dst.right && right >= left + 30 && bottom <= dst.bottom && bottom >= top + 30){    ChooseArea.set(left,top,right,bottom);   }else{    if(right > dst.right){     right = dst.right;    }        if(bottom > dst.bottom){     bottom = dst.bottom;    }        if(right < left + 30){     right = left + 30;    }        if(bottom < top + 30){     bottom = top + 30;    }    ChooseArea.set(left,top,right,bottom);   }   this.setPressRecLoc();  }    //每次改变选择区域矩形的大小或者移动，各角落上的小矩形也要改变它的Location  private void setPressRecLoc(){   recLT.set(ChooseArea.left-5,ChooseArea.top-5 , ChooseArea.left+5, ChooseArea.top+5);   recLB.set(ChooseArea.left-5,ChooseArea.bottom-5 , ChooseArea.left+5, ChooseArea.bottom+5);   recRT.set(ChooseArea.right-5,ChooseArea.top-5 , ChooseArea.right+5, ChooseArea.top+5);   recRB.set(ChooseArea.right-5,ChooseArea.bottom-5 , ChooseArea.right+5, ChooseArea.bottom+5);  }     public boolean judgeLocation(float x,float y){   float start_x = this.getChooseArea().left;   float start_y = this.getChooseArea().top;   float last_x = this.getChooseArea().right;   float last_y = this.getChooseArea().bottom;   //System.out.println("chubi:" + x + "," + y);   //System.out.println(start_y + "," + last_y);   if(x > start_x+10 && x < last_x-10 && y > start_y+10 && y < last_y-10){    return true;   }   return false;  }    public void onDraw(Canvas canvas){   super.onDraw(canvas);   if(firstFlag){    this.imageScale();    firstFlag = false;    mPaint.setColor(Color.RED);    System.out.println("Width: " + (dst.right - dst.left));    System.out.println("Height: " + (dst.bottom - dst.top));    System.out.println("Width: " + this.getDrawable().getIntrinsicWidth());    System.out.println("Height: " + this.getDrawable().getIntrinsicHeight());   }else{    set_LeftArea_Alpha();   }   canvas.drawRect(ChooseArea, mPaint);   mPaint.setColor(Color.BLUE);   canvas.drawRect(recLT, mPaint);   canvas.drawRect(recLB, mPaint);   canvas.drawRect(recRT, mPaint);    canvas.drawRect(recRB, mPaint);      canvas.drawRect(leftRectL, leftAreaPaint);   canvas.drawRect(leftRectR, leftAreaPaint);   canvas.drawRect(leftRectT, leftAreaPaint);   canvas.drawRect(leftRectB, leftAreaPaint);     }    public void set_LeftArea_Alpha(){   leftRectL.set(dst.left, dst.top, ChooseArea.left, dst.bottom);   leftRectR.set(ChooseArea.right,dst.top,dst.right,dst.bottom);   leftRectT.set(ChooseArea.left, dst.top, ChooseArea.right, ChooseArea.top);   leftRectB.set(ChooseArea.left,ChooseArea.bottom,ChooseArea.right,dst.bottom);  } } 

package com.artifex.mupdf.cut;   import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList;  import android.app.Activity; import android.graphics.Bitmap; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button;  import com.andorid.shu.love.R; import com.artifex.mupdf.Crop_Canvas; import com.artifex.mupdf.MuPDFActivity;  public class CutActivity extends Activity {  private Crop_Canvas canvas = null;  private Bitmap backBitmap;  private Button cancel;  private Button ensure;  private Button toPDF;   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   requestWindowFeature(Window.FEATURE_NO_TITLE);   setContentView(R.layout.cut_image);   backBitmap = MuPDFActivity.backBitmap;   init();   cancel = (Button) findViewById(R.id.cutCancel);   cancel.setOnClickListener(new OnClickListener() {     @Override    public void onClick(View v) {     CutActivity.this.finish();    }   });   ensure = (Button) findViewById(R.id.cutEnsure);   ensure.setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {     //图片保存的路径，之后将之转换为PDF，并以附件的形似发送邮件     File tmp = new File("/sdcard/lovereader/pic");     tmp.mkdirs();     File f = new File("/sdcard/lovereader/pic/" + "testpic" + ".png");     try {      f.createNewFile();     } catch (IOException e1) {      // TODO Auto-generated catch block      e1.printStackTrace();     }     FileOutputStream fOut = null;     try {       fOut = new FileOutputStream(f);     } catch (FileNotFoundException e) {       e.printStackTrace();     }     canvas.getSubsetBitmap().compress(Bitmap.CompressFormat.PNG, 100, fOut);     try {       fOut.flush();     } catch (IOException e) {       e.printStackTrace();     }     try {       fOut.close();     } catch (IOException e) {       e.printStackTrace();     }    }   });      toPDF = (Button)findViewById(R.id.toPDF);   toPDF.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View v) {     // TODO Auto-generated method stub     ArrayList<String> imageUrllist = new ArrayList<String>();     imageUrllist.add("/sdcard/lovereader/pic/" + "testpic" + ".png");     String pdfUrl = "/sdcard/lovereader/tmp/Foreverlove.pdf";     File tmp = new File("/sdcard/lovereader/tmp");     tmp.mkdirs();     File file = PdfManager.Pdf(imageUrllist, pdfUrl);     try {      file.createNewFile();     } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }         }   });  }   private void init() {   canvas = (Crop_Canvas) findViewById(R.id.myCanvas);   Bitmap bitmap = backBitmap;   canvas.setBitmap(bitmap);  }  }