[英]how to set default image size in image view with zoom in zoom out?
我正在使用水平滾動視圖,當我單擊水平滾動視圖的圖像按鈕時,我的圖像就會顯示在imageview中。 此功能正常工作。 在圖像視圖中,我可以縮放圖像。 但是縮放后,當我單擊scrollview的下一個圖像按鈕時,默認情況下,imageview顯示縮放的圖像。 實際上,它正在縮放前一張圖像。 所以我的問題是,如何刪除下一個圖像的上一個縮放。 我的意思是下一張圖像必須帶有默認大小,尚未縮放。
這是我的代碼。
public class ViewButtonActivity extends Activity implements OnClickListener,
OnTouchListener {
ImageView imgView;
private ProgressDialog pDialog;
public static boolean isTouch = false;
ImageButton imgButton1, imgButton2, imgButton3, imgButton4, imgButton5;
HorizontalScrollView horizontalScrollView;
public ImageLoader imageLoader;
public static String[] imageUrl = {
"http://0-03/_cover.jpg",
"http://www.magazine.jpg",
"http://large_1.jpg",
"http://4.bp.Apr2011.jpg",
"http://www.theof.com/git.jpg" };
private int mImageHeight, mImageWidth;
private static final String TAG = "Touch";
private static final float MIN_ZOOM = 1f, MAX_ZOOM = 1f;
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_button_click_activity);
imageLoader = new ImageLoader(getApplicationContext());
imgView = (ImageView) findViewById(R.id.image_view);
imgButton1 = (ImageButton) findViewById(R.id.imageButton1);
imgButton2 = (ImageButton) findViewById(R.id.imageButton2);
imgButton3 = (ImageButton) findViewById(R.id.imageButton3);
imgButton4 = (ImageButton) findViewById(R.id.imageButton4);
imgButton5 = (ImageButton) findViewById(R.id.imageButton5);
horizontalScrollView = (HorizontalScrollView) findViewById(R.id.horizontal_scroll_view);
imageLoader.DisplayImage(imageUrl[0], imgButton1);
imageLoader.DisplayImage(imageUrl[1], imgButton2);
imageLoader.DisplayImage(imageUrl[2], imgButton3);
imageLoader.DisplayImage(imageUrl[3], imgButton4);
imageLoader.DisplayImage(imageUrl[4], imgButton5);
imgButton1.setOnClickListener(this);
imgButton2.setOnClickListener(this);
imgButton3.setOnClickListener(this);
imgButton4.setOnClickListener(this);
imgButton5.setOnClickListener(this);
mImageHeight = imgView.getWidth();
mImageWidth = imgView.getHeight();
imgView.setOnTouchListener(this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.imageButton1:
imageLoader.DisplayImage(imageUrl[0], imgView);
break;
case R.id.imageButton2:
imageLoader.DisplayImage(imageUrl[1], imgView);
break;
case R.id.imageButton3:
imageLoader.DisplayImage(imageUrl[2], imgView);
break;
case R.id.imageButton4:
imageLoader.DisplayImage(imageUrl[3], imgView);
break;
case R.id.imageButton5:
imageLoader.DisplayImage(imageUrl[4], imgView);
// imgView.setImageResource(R.drawable.img5);
break;
}
}
public boolean onTouch(View v, MotionEvent event) {
ImageView imgView = (ImageView) v;
imgView.setScaleType(ImageView.ScaleType.MATRIX);
float scale;
dumpEvent(event);
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: // first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG"); // write to LogCat
mode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 5f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY()
- start.y); // create the transformation in the matrix
// of points
} else if (mode == ZOOM) {
// pinch zooming
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 5f) {
matrix.set(savedMatrix);
scale = newDist / oldDist; // setting the scaling of the
// matrix...if scale > 1 means
// zoom in...if scale < 1 means
// zoom out
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
imgView.setImageMatrix(matrix);
return true;
}
private float spacing(MotionEvent event)
{
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
private void midPoint(PointF point, MotionEvent event)
{
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
private void dumpEvent(MotionEvent event)
{
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE","POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_").append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP)
{
sb.append("(pid ").append(action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < event.getPointerCount(); i++)
{
sb.append("#").append(i);
sb.append("(pid ").append(event.getPointerId(i));
sb.append(")=").append((int) event.getX(i));
sb.append(",").append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
Log.d("Touch Events ---------", sb.toString());
}
}
假定您必須重置為包含轉換當前狀態(包括縮放)的Matrix的原始值? 我看到您已經掌握了Matrix,當您在onClick()期間前進到下一張圖像時,將其重置為舊值的方式是什么?
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