I am doing the following in my application. 1) Display a image in a activity.
2) Recognize gesture over that image. 3) And also doing pinch and zoom over the same image. The layout I have created is given below. * <?xml version="1.0" encoding="utf-8"?>* * <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"* * android:layout_width="fill_parent"* * android:layout_height="fill_parent" >* * <ImageView* * android:id="@+id/showImg"* * android:layout_width="wrap_content"* * android:layout_height="wrap_content"* * android:layout_gravity="center"* * android:scaleType="matrix"* * android:src="@drawable/image" >* * </ImageView>* * </FrameLayout>* And I am using the following code for the "pinch zoom" and "gesture overlayview" (detect the gesture). * public class Touch extends Activity implements OnTouchListener {* * private static final String TAG = "Touch";* * // These matrices will be used to move and zoom image* * Matrix matrix = new Matrix();* * Matrix savedMatrix = new 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 start = new PointF();* * PointF mid = new PointF();* * float oldDist = 1f;* * @Override* * public void onCreate(Bundle savedInstanceState) {* * super.onCreate(savedInstanceState);* * GestureOverlayView gestureOverlayView = new GestureOverlayView(this);* * View inflate = getLayoutInflater().inflate(R.layout.main, null);* * gestureOverlayView.addView(inflate);* * ImageView img = (ImageView) inflate.findViewById(R.id.showImg);* * img.setScaleType(ImageView.ScaleType.FIT_CENTER);* * img.setOnTouchListener(this);* * setContentView(gestureOverlayView);* * }* * public boolean onTouch(View v, MotionEvent event) {* * ImageView view = (ImageView) v;* * view.setScaleType(ImageView.ScaleType.MATRIX);* * float scale;* * // Dump touch event to log* * dumpEvent(event);* * // Handle touch events here...* * switch (event.getAction() & MotionEvent.ACTION_MASK) {* * case MotionEvent.ACTION_DOWN: // first finger down only * * Log.d(TAG, "mode=DRAG");* * 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: // 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) { // movement of first finger* * } else if (mode == ZOOM) { // pinch zooming* * float newDist = spacing(event);* * Log.d(TAG, "newDist=" + newDist);* * if (newDist > 5f) {* * matrix.set(savedMatrix);* * scale = newDist / oldDist; // thinking i need to play around* * // with this value to limit it* * matrix.postScale(scale, scale, mid.x, mid.y);* * }* * }* * break;* * }* * // Perform the transformation* * view.setImageMatrix(matrix);* * return true; // indicate event was handled* * }* * 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);* * }* * /** Show an event in the LogCat view, for debugging */* * 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(TAG, sb.toString());* * }* *}* The issue is mentioned below. The zoom is not working perfectly. sometimes, I do a pinch or zoom, it is not working. **NOTE: But when I remove the "GestureOverlayView", the pinch and zoom working perfectly over that imageview. But I need "GestureOverlayView" to detect gesture.** Is this a android issue or the coding issue? How can I fix this? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
