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我是 ANDROID 的新手,想在我自己的自定义视图中旋转、缩放和移动图像。但是我在同一个 onTouchEvent 方法中编写了所有这些(旋转、缩放、移动)。因此,当我移动图像时,它也会旋转或缩放图像,它会被移动。我必须分别处理它们,但不知道如何处理。我想我可以添加一个按钮,例如名称是“旋转”。所以我可以修复图像,它只允许旋转。但我无法在我的自定义视图中创建按钮。代码如下所示:

公共类 MyView 扩展视图 {

// The ‘active pointer’ is the one currently moving our object. private int mActivePointerId = INVALID_POINTER_ID; private static final int INVALID_POINTER_ID = -1; private ScaleGestureDetector mScaleDetector; private float mScaleFactor = 1.f; private float mPosX; private float mPosY; private float mLastTouchX; private float mLastTouchY; //For Fetching image private Bitmap bmp; private Drawable image; private byte[] byteArray; private ByteArrayBuffer baf = null; //For Rotation int direction = 0; int degree = 0; private float centerX ; private float centerY ; private float newX ; private float newY ; private float rotateX; private float rotateY; public MyView(Context context) { this(context, null, 0); } public MyView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); String url = "http://www.queness.com/resources/images/png/apple_ex.png"; AsyncTask<String,Void,ByteArrayBuffer> connection=new GetUrlData().execute(url); try { baf=connection.get(); } catch (InterruptedException e) { e.printStackTrace(); } catch (ExecutionException e) { e.printStackTrace(); } byteArray = baf.toByteArray(); bmp = BitmapFactory.decodeByteArray(byteArray, 0 , byteArray.length); image =new BitmapDrawable(context.getResources() , bmp); image.setBounds(0, 0, image.getIntrinsicWidth(), image.getIntrinsicHeight()); mScaleDetector = new ScaleGestureDetector(context, new ScaleListener()); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawColor(Color.BLACK); //For Rotation int height = this.getHeight(); int width = this.getWidth(); centerX = width/2; centerY = height/2; canvas.rotate(direction, width / 2, height / 2); canvas.save(); canvas.translate(mPosX, mPosY); canvas.scale(mScaleFactor, mScaleFactor); image.draw(canvas); canvas.restore(); } //For Rotation private void updateRotation(float newX2, float newY2) { degree = (int)Math.toDegrees(Math.atan2(newY, newX))-90; setDirection(degree); } //For Rotation public void setDirection(int direction) { this.direction = direction; this.invalidate(); } @Override public boolean onTouchEvent(MotionEvent event) { // Let the ScaleGestureDetector inspect all events. mScaleDetector.onTouchEvent(event); final int action = event.getAction(); if (action == MotionEvent.ACTION_DOWN) { final float x = event.getX(); final float y = event.getY(); mLastTouchX = x; mLastTouchY = y; mActivePointerId = event.getPointerId(0); } if (action == MotionEvent.ACTION_MOVE) { final int pointerIndex = event.findPointerIndex(mActivePointerId); final float x = event.getX(pointerIndex); final float y = event.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; //For Rotation rotateX = event.getX(); rotateY = event.getY(); newX = centerX-rotateX; newY = centerY-rotateY; updateRotation( newX, newY); } if (action == MotionEvent.ACTION_UP) { mActivePointerId = INVALID_POINTER_ID; updateRotation( newX, newY); } if (action == MotionEvent.ACTION_CANCEL) { mActivePointerId = INVALID_POINTER_ID; } if (action == MotionEvent.ACTION_POINTER_UP) { final int pointerIndex = (event.getAction() & 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; mLastTouchX = event.getX(newPointerIndex); mLastTouchY = event.getY(newPointerIndex); mActivePointerId = event.getPointerId(newPointerIndex); } } 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; } }

}

我希望我能说出我想要什么。你能帮我解决这个问题吗?

4

1 回答 1

2

试试下面的代码它对我有用。

float[] lastEvent = null;
float d = 0f;
float newRot = 0f;
private Matrix matrix = new Matrix();
private Matrix savedMatrix = new Matrix();
public static String fileNAME;
public static int framePos = 0;

private float scale = 0;
private float newDist = 0;

// Fields
private String TAG = this.getClass().getSimpleName();

// We can be in one of these 3 states
private static final int NONE = 0;
private static final int DRAG = 1;
private static final int ZOOM = 2;
private int mode = NONE;

// Remember some things for zooming
private PointF start = new PointF();
private PointF mid = new PointF();
float oldDist = 1f;

 public boolean onTouch(View v, MotionEvent event) {
            ImageView view = (ImageView) v;

            // Handle touch events here...
            switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                savedMatrix.set(matrix);
                start.set(event.getX(), event.getY());
                mode = DRAG;
                lastEvent = null;
                break;
            case MotionEvent.ACTION_POINTER_DOWN:
                oldDist = spacing(event);
                if (oldDist > 10f) {
                    savedMatrix.set(matrix);
                    midPoint(mid, event);
                    mode = ZOOM;
                }
                lastEvent = new float[4];
                lastEvent[0] = event.getX(0);
                lastEvent[1] = event.getX(1);
                lastEvent[2] = event.getY(0);
                lastEvent[3] = event.getY(1);
                d = rotation(event);
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_POINTER_UP:
                mode = NONE;
                lastEvent = null;
                break;
            case MotionEvent.ACTION_MOVE:
                if (mode == DRAG) {
                    // ...
                    matrix.set(savedMatrix);
                    matrix.postTranslate(event.getX() - start.x, event.getY()
                            - start.y);
                } else if (mode == ZOOM && event.getPointerCount() == 2) {
                    float newDist = spacing(event);
                    matrix.set(savedMatrix);
                    if (newDist > 10f) {
                        float scale = newDist / oldDist;
                        matrix.postScale(scale, scale, mid.x, mid.y);
                    }
                    if (lastEvent != null) {
                        newRot = rotation(event);
                        float r = newRot - d;
                        matrix.postRotate(r, view.getMeasuredWidth() / 2,
                                view.getMeasuredHeight() / 2);
                    }
                }
                break;
            }

            view.setImageMatrix(matrix);

            return true;
        }

//用于在多点触控上旋转图像。

private float rotation(MotionEvent event) {
    double delta_x = (event.getX(0) - event.getX(1));
    double delta_y = (event.getY(0) - event.getY(1));
    double radians = Math.atan2(delta_y, delta_x);

    return (float) Math.toDegrees(radians);
}
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);
    }
于 2013-09-17T06:37:30.097 回答