如何在android中将pinch和pangesture应用于imageview
您好,当我使用两个手指时,我需要使用捏手势缩放图像。当使用单手指时,我需要使用平移手势移动图像。我尝试使用以下代码缩放,但如何使用平移手势移动图像。有人建议我吗如何在android中将pinch和pangesture应用于imageview,android,android-listview,Android,Android Listview,您好,当我使用两个手指时,我需要使用捏手势缩放图像。当使用单手指时,我需要使用平移手势移动图像。我尝试使用以下代码缩放,但如何使用平移手势移动图像。有人建议我吗 MainActivity.class: public class MainActivity extends Activity { Zoomviewcrop img; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(s
MainActivity.class:
public class MainActivity extends Activity {
Zoomviewcrop img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
img=(Zoomviewcrop)findViewById(R.id.imageView2);
img.setImageResource(R.drawable.ic_launcher);
img.setMaxZoom(3f);
}
}
public class Zoomviewcrop extends ImageView {
Matrix 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 last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 3f;
float[] m;
int viewWidth, viewHeight;
static final int CLICK = 3;
float saveScale = 1f;
protected float origWidth, origHeight;
int oldMeasuredWidth, oldMeasuredHeight;
ScaleGestureDetector mScaleDetector;
Context context;
public Zoomviewcrop(Context context) {
super(context);
sharedConstructing(context);
}
public Zoomviewcrop(Context context, AttributeSet attrs) {
super(context, attrs);
sharedConstructing(context);
}
private void sharedConstructing(Context context) {
super.setClickable(true);
this.context = context;
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
matrix = new Matrix();
m = new float[9];
setImageMatrix(matrix);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
mScaleDetector.onTouchEvent(event);
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
last.set(curr);
start.set(last);
mode = DRAG;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
float deltaX = curr.x - last.x;
float deltaY = curr.y - last.y;
float fixTransX = getFixDragTrans(deltaX, viewWidth, origWidth * saveScale);
float fixTransY = getFixDragTrans(deltaY, viewHeight, origHeight * saveScale);
matrix.postTranslate(fixTransX, fixTransY);
fixTrans();
last.set(curr.x, curr.y);
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(matrix);
invalidate();
return true; // indicate event was handled
}
});
}
public void setMaxZoom(float x) {
maxScale = x;
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float mScaleFactor = detector.getScaleFactor();
float origScale = saveScale;
saveScale *= mScaleFactor;
if (saveScale > maxScale) {
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
} else if (saveScale < minScale) {
saveScale = minScale;
mScaleFactor = minScale / origScale;
}
if (origWidth * saveScale <= viewWidth || origHeight * saveScale <= viewHeight)
matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2, viewHeight / 2);
else
matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());
fixTrans();
return true;
}
}
void fixTrans() {
matrix.getValues(m);
float transX = m[Matrix.MTRANS_X];
float transY = m[Matrix.MTRANS_Y];
float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
float fixTransY = getFixTrans(transY, viewHeight, origHeight * saveScale);
if (fixTransX != 0 || fixTransY != 0)
matrix.postTranslate(fixTransX, fixTransY);
}
float getFixTrans(float trans, float viewSize, float contentSize) {
float minTrans, maxTrans;
if (contentSize <= viewSize) {
minTrans = 0;
maxTrans = viewSize - contentSize;
} else {
minTrans = viewSize - contentSize;
maxTrans = 0;
}
if (trans < minTrans)
return -trans + minTrans;
if (trans > maxTrans)
return -trans + maxTrans;
return 0;
}
float getFixDragTrans(float delta, float viewSize, float contentSize) {
if (contentSize <= viewSize) {
return 0;
}
return delta;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
viewWidth = MeasureSpec.getSize(widthMeasureSpec);
viewHeight = MeasureSpec.getSize(heightMeasureSpec);
//
// Rescales image on rotation
//
if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight
|| viewWidth == 0 || viewHeight == 0)
return;
oldMeasuredHeight = viewHeight;
oldMeasuredWidth = viewWidth;
if (saveScale == 1) {
//Fit to screen.
float scale;
Drawable drawable = getDrawable();
if (drawable == null || drawable.getIntrinsicWidth() == 0 || drawable.getIntrinsicHeight() == 0)
return;
int bmWidth = drawable.getIntrinsicWidth();
int bmHeight = drawable.getIntrinsicHeight();
Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight);
float scaleX = (float) viewWidth / (float) bmWidth;
float scaleY = (float) viewHeight / (float) bmHeight;
scale = Math.min(scaleX, scaleY);
matrix.setScale(scale, scale);
// Center the image
float redundantYSpace = (float) viewHeight - (scale * (float) bmHeight);
float redundantXSpace = (float) viewWidth - (scale * (float) bmWidth);
redundantYSpace /= (float) 2;
redundantXSpace /= (float) 2;
matrix.postTranslate(redundantXSpace, redundantYSpace);
origWidth = viewWidth - 2 * redundantXSpace;
origHeight = viewHeight - 2 * redundantYSpace;
setImageMatrix(matrix);
}
fixTrans();
}
}
MainActivity.class:
公共类MainActivity扩展了活动{
Zoomviewcrop img;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
img=(Zoomviewcrop)findviewbyd(R.id.imageView2);
img.setImageResource(R.drawable.ic_启动器);
img.setMaxZoom(3f);
}
}
公共类Zoomviewcrop扩展了ImageView{
矩阵;
//我们可能处于这三种状态之一
静态最终int NONE=0;
静态最终整数阻力=1;
静态最终整数缩放=2;
int模式=无;
//记住一些关于缩放的事情
PointF last=新的PointF();
PointF start=新的PointF();
浮动最小刻度=1f;
浮点最大刻度=3f;
浮动[]m;
int viewWidth,viewHeight;
静态最终int CLICK=3;
浮动存储比例=1f;
受保护的浮子起始宽度、起始高度;
int oldMeasuredWidth,oldMeasuredHeight;
scalegestruedetector mScaleDetector;
语境;
公共Zoomviewcrop(上下文){
超级(上下文);
共享构造(上下文);
}
公共Zoomviewcrop(上下文、属性集属性){
超级(上下文,attrs);
共享构造(上下文);
}
私有void共享构造(上下文){
super.setClickable(true);
this.context=上下文;
mScaleDetector=新的scalegestruedetector(上下文,新的ScaleListener());
矩阵=新矩阵();
m=新浮点数[9];
setImageMatrix(矩阵);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(新的OnTouchListener(){
公共布尔onTouch(视图v,运动事件){
mScaleDetector.onTouchEvent(事件);
PointF curr=新的PointF(event.getX(),event.getY());
开关(event.getAction()){
case MotionEvent.ACTION\u DOWN:
最后一组(当前);
开始。设置(最后);
模式=拖动;
打破
case MotionEvent.ACTION\u移动:
如果(模式==拖动){
浮动deltaX=当前x-最后x;
浮动三角洲=当前y-最后y;
float fixtranx=getfixtragtrans(deltaX、viewWidth、origWidth*saveScale);
float fixTransY=GetFixtragtrans(三角洲、视图高度、origHeight*保存比例);
矩阵后翻译(fixtranx,fixtrany);
fixTrans();
最后一组(当前x、当前y);
}
打破
case MotionEvent.ACTION\u UP:
模式=无;
intxdiff=(int)Math.abs(curr.x-start.x);
int yDiff=(int)Math.abs(curr.y-start.y);
if(xDiff最大比例){
saveScale=maxScale;
mScaleFactor=最大刻度/原始刻度;
}else if(保存比例<最小比例){
saveScale=minScale;
mScaleFactor=最小刻度/原始刻度;
}
如果(origWidth*saveScale每个手势都需要一个检测器,对于收缩缩放检测器(您使用的是:),要使用平移,请查看Croll上的方法
例:
我的错误:),你只能称之为。gestureHandler=new gestureHandler();你好,谢谢…我给了imageview的高度和宽度填充父项表示它工作…如果我给宽度和高度50/50,这意味着它不能移动和缩放..dnt介意请你如何根据fingure移动来移动50/50图像..我的邮件id甜美。ch7@gmail.com
private GestureDetector gestureDetector;
private GestureHandler gestureHandler;
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
gestureHandler = new GestureHandler(renderer);
gestureDetector = new GestureDetector(this, gestureHandler);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
gestureDetector.onTouchEvent(event);
return true;
}
public class GestureHandler extends SimpleOnGestureListener {
@Override
public boolean onScroll(final MotionEvent motionEvent, final MotionEvent currentMotionEvent,
final float distanceX, final float distanceY) {
// You can move here.
// Use distanceX and distanceY.
return true;
}
}