android仿快图浏览，图片缩放移动效果

代码是拿别人的改的，原来的有些BUG ，项目加载的都是网络图片还没弄左右滑动效果

yi 工具类

[java] package com.lin.image;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.Rect;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ImageView;

public class MyImageView extends ImageView {
    private    Matrix mMatrix;
    private float bWidth;// 图片宽度
    private float bHeight;

    private int dWidth;//屏幕宽度
    private int dHeight;//屏幕高度
    private float initScale;
    private float mScale;
    private float scale;
    ImageState mapState = new ImageState();
    private float oldDist;
    PointF mStart = new PointF();
    private Bitmap mBitmap;
    float[] values = new float[9];

    Matrix initMatrix;
    Matrix mSavedMatrix;

    public MyImageView(Context context) {
        super(context);
         this.setScaleType(ScaleType.MATRIX);
    }
    public void init(MotionEvent event){
        mStart.set(event.getX(), event.getY());
        mSavedMatrix.set(mMatrix);

    }
    float rate=1.0f;
     // 刷新界面
    public void setView() {
        //rate=rate/10*9;
        // UserUtils.log(TAG, "set view", "set view");
        //mMatrix.postScale(scale,scale,0,0);
        this.setImageMatrix(mMatrix);

        Rect rect = this.getDrawable().getBounds();
        this.getImageMatrix().getValues(values);
        bWidth = rect.width() * values[0];
        bHeight = rect.height() * values[0];

        mapState.left = values[2];
        mapState.top = values[5];
        mapState.right = mapState.left + bWidth;
        mapState.bottom = mapState.top + bHeight;
    }
    private float s=0.9f;
    public void setScale(){

        float sX = dWidth / 2;
        float sY = dHeight / 2;

       mMatrix.postScale(s, s, sX, sY);
       setView();
    }
    public void setScreenSize(Context context, int width, int height,Bitmap bitmap) {
         mBitmap =bitmap;
        dWidth = width;
        dHeight = height;
        setImageBitmap(mBitmap);
//        gd = new GestureDetector(context, new LearnGestureListener());

        bWidth = mBitmap.getWidth();
        bHeight = mBitmap.getHeight();
        // mView = (ImageView) findViewById(R.id.imageView);
        float xScale = (float) dWidth / bWidth;
        float yScale = (float) dHeight / bHeight;
        mScale = xScale <= yScale ? xScale : yScale;
      scale = mScale < 1 ? mScale : 1;
        initScale = scale;
        mMatrix = new Matrix();
        mSavedMatrix = new Matrix();
        System.out.println("dwidth==="+dHeight+" bHeight===="+bHeight);
        // 平移
        mMatrix.postTranslate((dWidth - bWidth) / 2, (dHeight - bHeight) / 2);

        float sX = dWidth / 2;
        float sY = dHeight / 2;

        mSavedMatrix.set(mMatrix);
       mMatrix.postScale(scale, scale, sX, sY);
        setView();
    }

    /** 计算移动距离 */
    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);
    }
    float backScale;
    //缩放
    public void zoom(MotionEvent event) {

        float newDist = spacing(event);
        if((mapState.right-mapState.left)>4*dWidth&&newDist>oldDist)
            return;
        Log.e("lin","oldDist="+oldDist+",newDist=="+newDist);
        if (newDist > 10f&&Math.abs((newDist-oldDist))>10f) {
            scale = newDist / oldDist;
            if (scale < 1) {
                mMatrix.postScale(scale, scale, d

补充：移动开发 , Android ,