在Android中调整大小并移动图像，Api <11 [关闭]

Question

我一直在努力实现

1. 拖放（移动）Api <11
2. 调整大小（比原始图像大）

是否有任何外部库可供我们调整大小并在View中移动图像？

外部材料，Api，图书馆和链接将受到欢迎。

Answer 1

与Matrix()和onTouchListener()一起玩耍是通过工作完成的。

public class CustomizeActivity extends Activity {
private static final String TAG = "Touch" ;
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
PointF start = new  PointF();
public static PointF mid = new PointF();

public static final int NONE = 0;
public static final int DRAG = 1;
public static final int ZOOM = 2;
public static int mode = NONE;
float oldDist;

private float[] matrixValues = new float[9];


public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
iv=new ImageView(this);
iv.setOnTouchListener(t);
}
 OnTouchListener t=new View.OnTouchListener() {

    public boolean onTouch(View v, MotionEvent event) {

        ImageView view = (ImageView) v;

        switch (event.getAction() & MotionEvent.ACTION_MASK) {

        case MotionEvent.ACTION_DOWN:

            savedMatrix.set(matrix);
            start.set(event.getX(), event.getY());
            Log.d(TAG, "mode=DRAG" );
            mode = DRAG;
            break;

        case MotionEvent.ACTION_POINTER_DOWN:

            oldDist = spacing(event);
            Log.d(TAG, "oldDist=" + oldDist);
            if (oldDist > 10f) {

                savedMatrix.set(matrix);
                midPoint(mid, event);
                mode = ZOOM;
                Log.d(TAG, "mode=ZOOM" );
            }
            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) {

                float newDist = spacing(event);
                Log.d(TAG, "newDist=" + newDist);
                if (newDist > 10f) {

                    matrix.set(savedMatrix);
                    float scale = newDist / oldDist;
                    matrix.postScale(scale, scale, mid.x, mid.y);
                }
            }
            break;

        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_POINTER_UP:

            mode = NONE;
            Log.d(TAG, "mode=NONE" );
            break;
        }

        // Perform the transformation
        view.setImageMatrix(matrix);

        return true; // indicate event was handled
    }

      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);
    }
};
  }