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[This post is by Dan Morrill, Open Source & Compatibility Program Manager. — Tim Bray] · run

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public class TouchExampleView extends View { private Drawable mIcon; private float mPosX; private float mPosY; private float mLastTouchX; private float mLastTouchY; public TouchExampleView(Context context) { this(context, null, 0); } public TouchExampleView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public TouchExampleView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mIcon = context.getResources().getDrawable(R.drawable.icon); mIcon.setBounds(0, 0, mIcon.getIntrinsicWidth(), mIcon.getIntrinsicHeight()); } @Override public void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.save(); canvas.translate(mPosX, mPosY); mIcon.draw(canvas); canvas.restore(); } @Override public boolean onTouchEvent(MotionEvent ev) { // More to come here later... return true; }
}
@Override
public boolean onTouchEvent(MotionEvent ev) { final int action = ev.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: { final float x = ev.getX(); final float y = ev.getY(); // Remember where we started mLastTouchX = x; mLastTouchY = y; break; } case MotionEvent.ACTION_MOVE: { final float x = ev.getX(); final float y = ev.getY(); // Calculate the distance moved final float dx = x - mLastTouchX; final 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; } } return true;
}
private static final int INVALID_POINTER_ID = -1; // The ‘active pointer’ is the one currently moving our object.
private int mActivePointerId = INVALID_POINTER_ID; // Existing code ... @Override
public boolean onTouchEvent(MotionEvent ev) { final int action = ev.getAction(); switch (action & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: { final float x = ev.getX(); final float y = ev.getY(); mLastTouchX = x; mLastTouchY = y; // Save the ID of this pointer mActivePointerId = ev.getPointerId(0); break; } case MotionEvent.ACTION_MOVE: { // Find the index of the active pointer and fetch its position final int pointerIndex = ev.findPointerIndex(mActivePointerId); final float x = ev.getX(pointerIndex); final float y = ev.getY(pointerIndex); final float dx = x - mLastTouchX; final float dy = y - mLastTouchY; mPosX += dx; mPosY += dy; mLastTouchX = x; mLastTouchY = y; invalidate(); break; } case MotionEvent.ACTION_UP: { 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 = ev.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; mLastTouchX = ev.getX(newPointerIndex); mLastTouchY = ev.getY(newPointerIndex); mActivePointerId = ev.getPointerId(newPointerIndex); } break; } } return true;
}
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f; // Existing code ... public TouchExampleView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mIcon = context.getResources().getDrawable(R.drawable.icon); mIcon.setBounds(0, 0, mIcon.getIntrinsicWidth(), mIcon.getIntrinsicHeight()); // Create our ScaleGestureDetector mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
} @Override
public boolean onTouchEvent(MotionEvent ev) { // Let the ScaleGestureDetector inspect all events. mScaleDetector.onTouchEvent(ev); final int action = ev.getAction(); switch (action & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: { final float x = ev.getX(); final float y = ev.getY(); mLastTouchX = x; mLastTouchY = y; mActivePointerId = ev.getPointerId(0); break; } case MotionEvent.ACTION_MOVE: { final int pointerIndex = ev.findPointerIndex(mActivePointerId); final float x = ev.getX(pointerIndex); final float y = ev.getY(pointerIndex); // Only move if the ScaleGestureDetector isn't processing a gesture. if (!mScaleDetector.isInProgress()) { final float dx = x - mLastTouchX; final float dy = y - mLastTouchY; mPosX += dx; mPosY += dy; invalidate(); } mLastTouchX = x; mLastTouchY = y; break; } case MotionEvent.ACTION_UP: { mActivePointerId = INVALID_POINTER_ID; break; } case MotionEvent.ACTION_CANCEL: { mActivePointerId = INVALID_POINTER_ID; break; } case MotionEvent.ACTION_POINTER_UP: { final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT; final int pointerId = ev.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; mLastTouchX = ev.getX(newPointerIndex); mLastTouchY = ev.getY(newPointerIndex); mActivePointerId = ev.getPointerId(newPointerIndex); } break; } } return true;
} @Override
public void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.save(); canvas.translate(mPosX, mPosY); canvas.scale(mScaleFactor, mScaleFactor); mIcon.draw(canvas); canvas.restore();
} 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; }
}

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