Android getWidth、getHeight、getLeft、getRight 在 setScaleX()、setScaleY() 之后不正确

Question

我尝试通过展开/收缩手势和相对布局上的拖放功能来实现放大/缩小。

这是我的 OnPinchListener 处理缩放效果的代码。ma​​inView 是布局 xml 文件中定义的 RelativeLayout。

我在 fakeview 中实现了触摸监听器，它应该在所有 View 的前面。触摸事件将根据代码更改主视图。

请问是否可以得到缩放后的实际left,top,width,height？left和top总是返回0,0，而原来的width和height缩放后。

非常感谢!

     <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linear_layout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <RelativeLayout
        android:id="@+id/zoomable_relative_layout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        >
          <ImageView
            android:id="@+id/imageView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:src="@drawable/background" />
        </RelativeLayout>

    <RelativeLayout
        android:id="@+id/relative_layout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >



    </RelativeLayout>

</RelativeLayout>




public class MainActivity extends Activity {
    //ZoomableRelativeLayout mainView = null;
    RelativeLayout mainView = null;
    RelativeLayout rl = null;
    public static final String TAG = "ZoomText."
            + MainActivity.class.getSimpleName();
    private int offset_x;
    private int offset_y;
    private boolean dragMutex = false;
    RelativeLayout fakeView = null;
    float width = 0, height = 0;
    private OnTouchListener listener = new OnTouchListener() {

        @Override
        public boolean onTouch(View arg0, MotionEvent event) {
            // Log.e(TAG, event + "");
            // Log.e(TAG, "Pointer Count = "+event.getPointerCount());
            Log.e(TAG,
                    event.getX() + "," + event.getY() + "|" + mainView.getX()
                            + "(" + mainView.getWidth() + "),"
                            + mainView.getY() + "(" + mainView.getHeight()
                            + ")");
            if (event.getX() >= mainView.getLeft()
                    && event.getX() <= mainView.getLeft() + mainView.getWidth()
                    && event.getY() >= mainView.getTop()
                    && event.getY() <=mainView.getTop() + mainView.getHeight())
                if (event.getPointerCount() > 1) {
                    return scaleGestureDetector.onTouchEvent(event);
                } else {
                    return llListener.onTouch(arg0, event);
                }
            return false;

        }

    };

    private ScaleGestureDetector scaleGestureDetector;
    private OnTouchListener llListener = new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            // Log.d(TAG, event + ",LL");
            switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                offset_x = (int) event.getX();
                offset_y = (int) event.getY();
                // Log.e(TAG, offset_x + "," + offset_y);

                dragMutex = true;
                return true;
            case MotionEvent.ACTION_MOVE:
//              Log.e(TAG, "Finger down");
                int x = (int) event.getX() - offset_x;
                int y = (int) event.getY() - offset_y;
                Log.e(TAG, event.getX() + "," + event.getY());
                float _x = mainView.getX();
                float _y = mainView.getY();
                mainView.setX(_x + x);
                mainView.setY(_y + y);
                offset_x = (int) event.getX();
                offset_y = (int) event.getY();
                return true;
            case MotionEvent.ACTION_UP:
                dragMutex = false;
                return true;
            }
            return false;
        }

    };
    private OnDragListener dragListener = new View.OnDragListener() {

        @Override
        public boolean onDrag(View arg0, DragEvent arg1) {
            Log.e(TAG, "DRAG Listener = " + arg1);
            return false;
        }

    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mainView = (RelativeLayout) findViewById(R.id.zoomable_relative_layout);
        // mainView.setOnTouchListener(new OnPinchListener());
        // mainView.setOnTouchListener(listener);
        scaleGestureDetector = new ScaleGestureDetector(this,
                new OnPinchListener());
        rl = (RelativeLayout) findViewById(R.id.linear_layout);
        mainView.setOnDragListener(dragListener);
        // mainView.setOnTouchListener(llListener);
        fakeView = (RelativeLayout) findViewById(R.id.relative_layout);
        fakeView.setOnTouchListener(listener);
    }

    class OnPinchListener extends SimpleOnScaleGestureListener {

        float startingSpan;
        float endSpan;
        float startFocusX;
        float startFocusY;

        public boolean onScaleBegin(ScaleGestureDetector detector) {
            startingSpan = detector.getCurrentSpan();
            startFocusX = detector.getFocusX();
            startFocusY = detector.getFocusY();
            return true;
        }

        public boolean onScale(ScaleGestureDetector detector) {
//          mainView.scale(detector.getCurrentSpan() / startingSpan,
//                  startFocusX, startFocusY);
//          if(width==0)
//              width = mainView.getWidth();
//          if(height==0)
//              height = mainView.getHeight();
            mainView.setPivotX(startFocusX);
            mainView.setPivotY(startFocusY);  
            mainView.setScaleX(detector.getCurrentSpan() / startingSpan);
            mainView.setScaleY(detector.getCurrentSpan() / startingSpan);  

//          LayoutParams  para = mainView.getLayoutParams();
//          width*=detector.getCurrentSpan() / startingSpan;
//          height*=detector.getCurrentSpan() / startingSpan;
//          para.width = (int)width;
//          para.height = (int)height;
//          mainView.setLayoutParams(para);


            return true;
        }

        public void onScaleEnd(ScaleGestureDetector detector) {
            //mainView.restore();
            mainView.invalidate();
            Log.e(TAG, mainView.getLeft()+","+mainView.getRight());
        }
    }
}

Answer 1

您需要获取变换矩阵并使用它来变换您的原始点。

所以像这样(在你做缩放之后):

Matrix m = view.getMatrix(); //gives you the transform matrix
m.mapPoints(newPoints, oldPoints); //transform the original points.