TouchImageView用于重置视图

Question

我是android新手。我正在开发一个壁纸应用程序。我使用2个按钮来改变图像。图像正在改变。并使用TouchImageView类放大或缩小这些图像。使用此类图像可以放大和缩小。但问题是，当我放大图像（例如到2f）并单击下一个按钮来更改图像时，从2f显示的当前图像变焦，而不是从基础。下一个图像应该从它的基础显示（例如1f）。所以PLZ帮助我解决这个问题。这是我的TouchImageView类。

public class TouchImageView extends ImageView {
Matrix matrix; 
// We can be in one of three states
static int NONE=0;
static int DRAG=1;
static int ZOOM=2;
int mode=NONE;
// Remember some things for zooming
PointF last = new PointF ();
PointF last = new PointF ();
float minScale = 1f;
float maxScale = 2f;
float[] m;
int viewWidth, viewHeight;
static int CLICK = 3;
float saveScale = 1f; 
protected float origWidth, origHeight; 
int oldMeasuredWidth, oldMeasuredHeight;
ScaleGestureDetector mScaleDetector; 
Context context; 
public TouchImageView (Context context) {
super (context);
sharedConstructing ( context ); 
}
public TouchImageView (Context context, AttributeSet attrs ) {
super ( context, attrs ); 
sharedConstructing ( context ); 
}
public void resetView () {
// we can be in one of three states
NONE = 0;
DRAG = 1;
ZOOM = 2;
mode = NONE;
// Remember some things for zooming
last = new PointF ( ); 
start= new PointF ( ); 
minScale = 1f;
maxScale = 2f;
CLICK =3;
saveScale = 1f; 
matrix = new Matrix ();
m = new float [ 9 ]; 
setImageMatrix ( matrix ); 
setScaleType ( ScaleType.MATRIX ); 
}
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 ( ) {
@Override
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 ); 
}
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 getFixTrans (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 ); 
// Rescaled 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 ) bmHeight / ( 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 ); 
origWidth = viewWidth - 2 * redundantXSpace; 
origHeight = viewHeight -2 * redundantYSpace; 
setImageMatrix ( matrix ); 
}
fixTrans ();
}
}

Answer 1

使用最新版本的Touchimageview。

https://github.com/MikeOrtiz/TouchImageView 将此变量设置为false。