androidimagepinchzoom
why remained unable to show reset image
I am developing an app of wallpapers. When I have zoomed an image and clicked the Next button to see the next image, the next image is shown at the zoom level remaining from previous image.
You can seen the images below and also my code.
Here is the first image in normal state.
When I zoomed the image.
When I click the next button to change image then image seen zoomed.
Image should seen like this without zoomed.
Here is xml.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="fill"
android:orientation="vertical"
android:weightSum="100" >
<com.example.imagezoom.TouchImageView
android:id="@+id/idImageViewPic"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="100"
android:adjustViewBounds="true"
android:background="#66FFFFFF"
android:maxHeight="91dip"
android:maxWidth="47dip"
android:src="@drawable/a1" />
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<Button
android:id="@+id/bprev"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Back" >
</Button>
<Button
android:id="@+id/bnext"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Next" >
</Button>
</LinearLayout>
</LinearLayout>
Main Activity.
public class Main extends Activity {
private ImageView hImageViewPic;
private Button iButton, gButton;
private int currentImage = 0;
int[] images = { R.drawable.r1, R.drawable.r2, R.drawable.r3, R.drawable.r4, R.drawable.r5, R.drawable.r6, R.drawable.r7, R.drawable.r8, R.drawable.r9, R.drawable.r10 };
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
hImageViewPic = (ImageView)findViewById(R.id.idImageViewPic);
iButton = (Button) findViewById(R.id.bnext);
gButton = (Button) findViewById(R.id.bprev);
//Just set one Click listener for the image
iButton.setOnClickListener(iButtonChangeImageListener);
gButton.setOnClickListener(gButtonChangeImageListener);
}
View.OnClickListener iButtonChangeImageListener = new OnClickListener() {
public void onClick(View v) {
//Increase Counter to move to next Image
currentImage++;
currentImage = currentImage % images.length;
hImageViewPic.setImageResource(images[currentImage]);
}
};
View.OnClickListener gButtonChangeImageListener = new OnClickListener() {
public void onClick(View v) {
//Increase Counter to move to next Image
currentImage--;
currentImage = currentImage % images.length;
hImageViewPic.setImageResource(images[currentImage]);
}
};
}
TouchImageView.
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;
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 );
}
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 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 ();
}
}
Please help. What I have to do to overcome this issue.
Solution
You're not calling resetview() in your ButtonChangeImageListener.
Basically, you need to call resetView() in your next or prev onClick()
EDIT:
1. You might have to .. in your MainActivity, you have hImageViewPic = (ImageView)findViewById(R.id.idImageViewPic); This should be hImageViewPic = (TouchImageView)findViewById(R.id.idImageViewPic);
- (obligatory)
in
TouchView.java, iniButtonChangeImageListenerandgButtonChangeImageListener, you have to add the linehImageViewPic.resetView().