Android之关于手势操作图片的缩放与移动

<?xml version="1.0" encoding="UTF-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/linearLayout1"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    android:weightSum="1" >    <ImageView        android:id="@+id/imag"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:scaleType="matrix"        android:src="@drawable/a" >    </ImageView>    <ImageView        android:id="@+id/imag1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:scaleType="matrix" >    </ImageView></LinearLayout>

实现代码：package hfut.gmm;import javax.swing.text.View;import javax.swing.text.html.ImageView;public class Img_control extends Activity implements OnTouchListener {//implements OnTouchListener {private ImageView imgview;private ImageView img;private Matrix matrix=new Matrix();private Matrix savedMatrix=new Matrix();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;  //private GestureDetector gesture;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);this.setContentView(R.layout.img_control);imgview=(ImageView)this.findViewById(R.id.imag1);imgview.setAnimation(AnimationUtils.loadAnimation(this, R.anim.newanim));img=(ImageView)this.findViewById(R.id.imag);Matrix mt=img.getImageMatrix();//mt.postRotate(30);mt.postScale(0.5f,0.5f);mt.postScale(1.5f,1.5f);mt.postRotate(30, 130, 100);mt.postTranslate(100, 10);img.setImageMatrix(mt);//imgview.setLongClickable(true);imgview.setImageBitmap(BitmapFactory.decodeResource(this.getResources(), R.drawable.a));imgview.setOnTouchListener(this);imgview.setLongClickable(true);}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);  }  @Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stub/*Log.d("Infor", "类别:"+event.getAction());Log.d("Infor", "mask:"+event.getActionMasked());Log.d("Infor", "index:"+event.getActionIndex());Log.d("Infor", "points:"+event.getPointerCount());*/Log.d("Infor", "size:"+event.getSize());if(event.getActionMasked()==MotionEvent.ACTION_POINTER_UP)Log.d("Infor", "多点操作");switch(event.getActionMasked()){case MotionEvent.ACTION_DOWN:matrix.set(imgview.getImageMatrix());savedMatrix.set(matrix);start.set(event.getX(),event.getY());Log.d("Infor", "触摸了...");mode=DRAG;break;case MotionEvent.ACTION_POINTER_DOWN:  //多点触控oldDist=this.spacing(event);if(oldDist>10f){Log.d("Infor", "oldDist"+oldDist);savedMatrix.set(matrix);midPoint(mid,event);mode=ZOOM;}break;case MotionEvent.ACTION_POINTER_UP:mode=NONE;break;case MotionEvent.ACTION_MOVE:if(mode==DRAG){         //此实现图片的拖动功能...matrix.set(savedMatrix);matrix.postTranslate(event.getX()-start.x, event.getY()-start.y);}else if(mode==ZOOM){// 此实现图片的缩放功能...float newDist=spacing(event);if(newDist>10){matrix.set(savedMatrix);float scale=newDist/oldDist;matrix.postScale(scale, scale, mid.x, mid.y);     }}break;}imgview.setImageMatrix(matrix);return false;}}

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