Android手势控制实现缩放、移动图片

概述本文实例为大家分享了Android手势控制实现缩放、移动图片的方法，供大家参考，具体内容如下

本文实例为大家分享了AndroID手势控制实现缩放、移动图片的方法，供大家参考，具体内容如下

新建一个触摸监听器类

package com.liyong.btprinter; import androID.graphics.Matrix; import androID.graphics.PointF; import androID.util.floatMath; import androID.vIEw.MotionEvent; import androID.vIEw.VIEw; import androID.vIEw.VIEw.OntouchListener; import androID.Widget.ImageVIEw; public class MulitPointtouchListener implements OntouchListener { private static final String TAG = "touch";   // These matrices will be used to move and zoom image   Matrix matrix = new Matrix();   Matrix savedMatrix = new Matrix();   // We can be in one of these 3 states   static final int NONE = 0;   static final int DRAG = 1;   static final int ZOOM = 2;   int mode = NONE;   // Remember some things for zooming   PointF start = new PointF();   PointF mID = new PointF();   float olddist = 1f;   @OverrIDe   public boolean ontouch(VIEw v,MotionEvent event) {       ImageVIEw vIEw = (ImageVIEw) v;       // Log.e("vIEw_wIDth",// vIEw.getimageMatrix()..toString()+"*"+v.getWIDth());       // Dump touch event to log       dumpEvent(event);       // Handle touch events here...       switch (event.getAction() & MotionEvent.ACTION_MASK) {       case MotionEvent.ACTION_DOWN:           matrix.set(vIEw.getimageMatrix());           savedMatrix.set(matrix);           start.set(event.getX(),event.getY());           //Log.d(TAG,"mode=DRAG");           mode = DRAG;                     //Log.d(TAG,"mode=NONE");           break;       case MotionEvent.ACTION_POINTER_DOWN:           olddist = spacing(event);           //Log.d(TAG,"olddist=" + olddist);           if (olddist > 10f) {               savedMatrix.set(matrix);               mIDPoint(mID,event);               mode = ZOOM;               //Log.d(TAG,"mode=ZOOM");           }           break;       case MotionEvent.ACTION_UP:       case MotionEvent.ACTION_POINTER_UP:           mode = NONE;           //Log.e("vIEw.getWIDth",vIEw.getWIDth() + "");           //Log.e("vIEw.getHeight",vIEw.getHeight() + "");           break;       case MotionEvent.ACTION_MOVE:           if (mode == DRAG) {               // ...               matrix.set(savedMatrix);               matrix.postTranslate(event.getX() - start.x,event.getY()                       - start.y);           } else if (mode == ZOOM) {               float newdist = spacing(event);               //Log.d(TAG,"newdist=" + newdist);               if (newdist > 10f) {                   matrix.set(savedMatrix);                   float scale = newdist / olddist;                   matrix.postscale(scale,scale,mID.x,mID.y);               }           }           break;       }       vIEw.setimageMatrix(matrix);       return true; // indicate event was handled   }   private voID dumpEvent(MotionEvent event) {       String names[] = { "DOWN","UP","MOVE","CANCEL","OUTSIDE","POINTER_DOWN","POINTER_UP","7?","8?","9?" };       StringBuilder sb = new StringBuilder();       int action = event.getAction();       int actionCode = action & MotionEvent.ACTION_MASK;       sb.append("event ACTION_").append(names[actionCode]);       if (actionCode == MotionEvent.ACTION_POINTER_DOWN               || actionCode == MotionEvent.ACTION_POINTER_UP) {           sb.append("(pID ").append(                   action >> MotionEvent.ACTION_POINTER_ID_SHIFT);           sb.append(")");       }       sb.append("[");       for (int i = 0; i < event.getPointerCount(); i++) {           sb.append("#").append(i);           sb.append("(pID ").append(event.getPointerID(i));           sb.append(")=").append((int) event.getX(i));           sb.append(",").append((int) event.getY(i));           if (i + 1 < event.getPointerCount())               sb.append(";");       }       sb.append("]");       //Log.d(TAG,sb.toString());   }     private float spacing(MotionEvent event) {       float x = event.getX(0) - event.getX(1);       float y = event.getY(0) - event.getY(1);       return floatMath.sqrt(x * x + y * y);   }     private voID mIDPoint(PointF point,MotionEvent event) {       float x = event.getX(0) + event.getX(1);       float y = event.getY(0) + event.getY(1);       point.set(x / 2,y / 2);   } }

编写一个xml文件

<?xml version="1.0" enCoding="UTF-8"?>   <linearLayout   xmlns:androID="http://schemas.androID.com/apk/res/androID"   androID:orIEntation="vertical"   androID:layout_height="fill_parent"   androID:layout_wIDth="fill_parent"   androID:ID="@+ID/linearLayout1"   androID:weightSum="1">     <ImageVIEw androID:layout_wIDth="fill_parent"     androID:ID="@+ID/privIEwimage"     androID:layout_height="fill_parent"     androID:layout_gravity="center"     androID:scaleType="matrix"     >    </ImageVIEw>   </linearLayout> 

注意其中的: androID:scaleType="matrix"

privIEwimage.setimageBitmap(ActivityPrevIEwImage.click_bitmap); privIEwimage=(ImageVIEw)findVIEwByID(R.ID.privIEwimage); privIEwimage.setontouchListener(new MulitPointtouchListener()); 

以上就是AndroID手势控制缩放移动图片的全部代码，希望对大家的学习有所帮助。

总结

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