0

我有扩展视图的类我可以将一个图像移到另一个上为此我使用两个位图图像一个在另一个上现在我想使用双击事件保存图像但我不知道如何做到这一点....任何人都可以对此有一些想法或代码......

`公共类 ShowCanvas 扩展视图 {

Bitmap CanvasBitmap;
Bitmap ScaledBitmap;
Bitmap smallbitmap;
private static final int INVALID_POINTER_ID = -1;

private Drawable mImage;
private float mPosX;
private float mPosY;

private float mLastTouchX;
private float mLastTouchY;
private int mActivePointerId = INVALID_POINTER_ID;

private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;

public ShowCanvas(Context context) {

这（上下文，空，0）；// TODO 自动生成的构造函数存根

    ScaledBitmap = DrawView.scaled;

    mImage = new BitmapDrawable(getResources(), Dress.bitmap);


    System.out.println("MImage" +mImage);

    mImage.setBounds(0, 0, mImage.getIntrinsicWidth(),
            mImage.getIntrinsicHeight());

}

public ShowCanvas(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public ShowCanvas(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}

public void setBitmap(Bitmap bitmap) {
    // TODO Auto-generated method stub
    CanvasBitmap = bitmap;

    System.out.println("CanvasBitmap" + CanvasBitmap);

    int X = CanvasBitmap.getHeight();
    int Y = CanvasBitmap.getWidth();

    System.out.println("CanvasBitmap " + X + "\t" + Y);

}

@Override
public boolean isLongClickable() {
    // TODO Auto-generated method stub

    System.out.println("ISLongClickable");
    return super.isLongClickable();
}

@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
protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    Paint mpaint = new Paint();

    canvas.save();
    canvas.drawBitmap(ScaledBitmap, 0, 0, mpaint);
    Log.d("DEBUG", "X: " + mPosX + " Y: " + mPosY);
    canvas.translate(mPosX, mPosY);
    canvas.scale(mScaleFactor, mScaleFactor);
    mImage.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, 10.0f));

        invalidate();
        return true;
    }
}

}`

4

1 回答 1

2

如果您的意思是双击，则必须使用 GestureDetector.OnDoubleTapListener。检查这个链接

试试这个

public class MyView extends View {

GestureDetector gestureDetector;

public MyView(Context context, AttributeSet attrs) {
    super(context, attrs);
            // creating new gesture detector
    gestureDetector = new GestureDetector(context, new GestureListener());
}

// skipping measure calculation and drawing

    // delegate the event to the gesture detector
@Override
public boolean onTouchEvent(MotionEvent e) {
    return gestureDetector.onTouchEvent(e);
}


private class GestureListener extends GestureDetector.SimpleOnGestureListener {

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }
    // event when double tap occurs
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        float x = e.getX();
        float y = e.getY();

        Log.d("Double Tap", "Tapped at: (" + x + "," + y + ")");

        return true;
    }
}
}
于 2012-05-15T05:45:54.920 回答