ImageView手勢 雙擊可縮放

import android.content.context;

import android.graphics.matrix;
import android.graphics.pointf;
import android.graphics.drawable.drawable;
import android.util.attributeset;
import android.util.log;
import android.view.motionevent;
import android.view.view;
import android.widget.imageview;
/*** imageview手勢/雙擊可縮放
* created on 2019/11/4.
*/public class gestureimageview extends imageview implements view.ontouchlistener 
private int curmode=0;
private matrix matrix;
private pointf viewsize;
private pointf imagesize;
private pointf scalesize;
//記錄當前座標
private pointf curpoint;
private pointf originscale;
//0:寬度適應 1:高度適應
private int fitmode=0;
private pointf start;
private pointf center;
private float scaledoublezoom=0;
private pointf relativepoint;
private float doublefingerdistance=0;
long doubleclicktimespan=280;
long lastclicktime=0;
int rationzoomin=2;
public void gestureimageviewinit()
@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) else 
fitcenter();
}/**
* 使儲存在**
*/public void fitcenter()
if(curmode==zoommode.doublezoomin) 
}break;
case motionevent.action_up:
//手指鬆開時觸發事件
break;
}//注意這裡return 的一定要是true 否則只會觸發按下事件
return true;
}/**
* 根據縮放因子縮放
* @param scale
*/public void setimagescale(pointf scale)
/*** 根據偏移量改變位置
* @param offset
*/public void setimagetranslation (pointf offset) 
public static float getdoublefingerdistance (motionevent event) 
}

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