1
我正在開發一款壁紙應用程序。當我放大圖像並單擊下一個按鈕查看下一張圖像時，下一張圖像將顯示在上一張圖像剩餘的縮放級別上。爲什麼仍然無法顯示重置圖像
你可以看到下面的圖片和我的代碼。
這是處於正常狀態的第一張圖片。 
當我放大圖像。
當我點擊下一個按鈕來改變圖像，然後看到圖像放大。
圖片應該看起來像這樣沒有放大。
這裏是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>
主要活動。
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();
}
}
請幫忙。我需要做些什麼來克服這個問題。
Thanx bro。你能告訴我怎麼稱呼resetview。我是android新手，對此不太瞭解。 – HBBR
編輯回答 –
先生，當我添加hImageViewPic.resetView（）。然後resetview顯示錯誤。 – HBBR