My goal is to create a pinch to zoom edittext.
After some googling, someone kind enough to share this class on github:
public ZoomEditTextView(Context context, AttributeSet attrs) {
super(context, attrs, 0);
this.mContext = context;
init();
}
public ZoomEditTextView(Context context) {
super(context, null, 0);
this.mContext = context;
init();
setFocusable(true);
requestFocus();
/*@formatter:off
this.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent me) {
InputMethodManager imm = (InputMethodManager) mContext.getSystemService(mContext.INPUT_METHOD_SERVICE);
imm.showSoftInput(v, InputMethodManager.SHOW_IMPLICIT);
return true;
}
});*/
}
private void init() {
// Create our ScaleGestureDetector
mScaleDetector = new ScaleGestureDetector(mContext, new ScaleListener());
// Sets up drawing tools
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
mCirclePaint = new Paint();
mCirclePath = new Path();
mCirclePaint.setAntiAlias(true);
mCirclePaint.setColor(Color.CYAN);
mCirclePaint.setStyle(Paint.Style.STROKE);
mCirclePaint.setStrokeJoin(Paint.Join.MITER);
mCirclePaint.setStrokeWidth(4f);
//
mDrawingPaint = new Paint();
mDrawingPaint.setAntiAlias(true);
mDrawingPaint.setDither(true);
mDrawingPaint.setColor(Color.GREEN);
mDrawingPaint.setStyle(Paint.Style.STROKE);
mDrawingPaint.setStrokeJoin(Paint.Join.ROUND);
mDrawingPaint.setStrokeCap(Paint.Cap.ROUND);
mDrawingPaint.setStrokeWidth(mBrushSize);
mRectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mRectPaint.setStyle(Paint.Style.STROKE);
mRectPaint.setColor(Color.WHITE);
mDrawable = mContext.getResources().getDrawable(R.drawable.icon);
mDrawable.setBounds(0, 0, mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());
setDrawingCacheEnabled(true);
buildDrawingCache();
}
@Override
protected void onDraw(Canvas canvas) {
canvas.save();
//
canvas.translate(mPosX, mPosY);
canvas.scale(mScaleFactor, mScaleFactor);
// canvas.drawRect(new Rect(0, 0, canvas.getWidth(),
// canvas.getHeight()), mRectPaint);
super.onDraw(canvas);
// mDrawable.draw(canvas);
// if (mBitmap != null && canvas != null) {
// canvas.drawBitmap(mBitmap, mPosX, mPosY, mPaint);
// }
canvas.restore();
}
// Listen for multi-touch drag event and redraw the view accordingly
@Override
public boolean onTouchEvent(MotionEvent event) {
// Let the ScaleGestureDetector inspect all events.
mScaleDetector.onTouchEvent(event);
final int action = event.getAction();
switch (action) {
// a touch down
case MotionEvent.ACTION_DOWN: {
// Scale detector is not in progress
if (!mScaleDetector.isInProgress()) {
final float x = event.getX();
final float y = event.getY();
// Save the ID of this pointer
mActivePointerId = event.getPointerId(0);
// Remember where we started
mLastTouchX = x;
mLastTouchY = y;
// Save the ID of this pointer
mActivePointerId = event.getPointerId(0);
break;
}
}
case MotionEvent.ACTION_MOVE: {
// Only move the image if the scale detector is not in progress
if (!mScaleDetector.isInProgress()) {
// Find the index of active pointer and save its position
final int pointerIndex = event.findPointerIndex(mActivePointerId);
final float x = event.getX(pointerIndex);
final float y = event.getY(pointerIndex);
// mBitmap = getDrawingCache();
// Calculate the distance moved
float dx = x - mLastTouchX;
float dy = y - mLastTouchY;
// Move the object
mPosX += dx;
mPosY += dy;
// Remember this touch position for the next move event
mLastTouchX = x;
mLastTouchY = y;
// Invalidate to request a redraw
invalidate();
// break;
} /*
* else {
*
* final float gx = mScaleDetector.getFocusX(); final float gy
* = mScaleDetector.getFocusY();
*
* final float gdx = gx - mLastGestureX; final float gdy = gy
* - mLastGestureY;
*
* mPosX += gdx; mPosY += gdy;
*
* invalidate();
*
* mLastGestureX = gx; mLastGestureY = gy;
*
* }
*/
break;
}
case MotionEvent.ACTION_UP: {
//setFocusable(true);
//requestFocus();
InputMethodManager imm = (InputMethodManager) mContext.getSystemService(mContext.INPUT_METHOD_SERVICE);
//imm.showSoftInput(ZoomEditTextView.this, InputMethodManager.SHOW_IMPLICIT);
imm.toggleSoftInput(0, InputMethodManager.SHOW_IMPLICIT);
// Reset the active pointer id
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_CANCEL: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_POINTER_UP: {
// Extract the index of the pointer that left the touch sensor
final int pointerIndex = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = event.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
if (event.getPointerCount() >= 2) {
mLastTouchX = event.getX(newPointerIndex);
mLastTouchY = event.getY(newPointerIndex);
}
mActivePointerId = event.getPointerId(newPointerIndex);
} else {
final int tempPointerIndex = event.findPointerIndex(mActivePointerId);
mLastTouchX = event.getX(tempPointerIndex);
mLastTouchY = event.getY(tempPointerIndex);
}
break;
}
}
return true;
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f));
invalidate();
return true;
}
}
The class is working perfectly for "drag and drop" and "pinch to zoom", but the edittext cant be edited. The keyboard is shown, but the edittext is not focused so i cant type anything.
The editing part is on this code :
case MotionEvent.ACTION_UP: {
//setFocusable(true);
//requestFocus();
InputMethodManager imm = (InputMethodManager) mContext.getSystemService(mContext.INPUT_METHOD_SERVICE);
//imm.showSoftInput(ZoomEditTextView.this, InputMethodManager.SHOW_IMPLICIT);
imm.toggleSoftInput(0, InputMethodManager.SHOW_IMPLICIT);
// Reset the active pointer id
mActivePointerId = INVALID_POINTER_ID;
break;
}
Please help me and just tell me if you have more question. Thanks
