如何在android中设置图像移动的边界

我创建了一个图像视图，并使用OnTouchListener将其移动。如何将移动限制在屏幕的边界？

您可以计算屏幕大小，并修复屏幕内的图像移动，如下图所示

Display display = getWindowManager().getDefaultDisplay();
            width = display.getWidth();
            height = display.getHeight();

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你不想要一个听众，你想要一个听众。查找不同的DrageEvent操作类型以获取有关视图所在位置的信息。从那里，只要您知道视图的尺寸，就可以禁止它移出屏幕。

我根据在这里找到的代码做了类似的操作：

它基于谷歌的启动程序代码。为了保持屏幕上的视图，我修改了onTouchEvent方法以保持屏幕上的视图

public boolean onTouchEvent(MotionEvent ev) {
    if (!mDragging) {
        return false;
    }
    final int action = ev.getAction();
    final int screenX = clamp((int)ev.getRawX(), 0, mDisplayMetrics.widthPixels);
    final int screenY = clamp((int)ev.getRawY(), 0, mDisplayMetrics.heightPixels);
    //**ADDED to keep view entirely on screen
    final int[] parentpos = {-1,-1};
    ((View) mDragSource).getLocationOnScreen(parentpos);
    int minScreenX = parentpos[0] + (int)mTouchOffsetX;
    int minScreenY = parentpos[1] + (int)mTouchOffsetY;
    int maxScreenX = minScreenX + ((View) mDragSource).getWidth() - mDragView.getWidth();
    int maxScreenY = minScreenY + ((View) mDragSource).getHeight() - mDragView.getHeight();
    //end ADDED

这里呢

    case MotionEvent.ACTION_MOVE:
        // Update the drag view.  Don't use the clamped pos here so the dragging looks
        // like it goes off screen a little, intead of bumping up against the edge.
        // **CHANGED to keep view entirely on screen
        mDragView.move(clamp(screenX,minScreenX,maxScreenX), 
                clamp(screenY,minScreenY,maxScreenY));
        // end CHANGED

    case MotionEvent.ACTION_UP:
        if (mDragging) {
            // **CHANGED to keep view entirely on screen
            drop(clamp(screenX,minScreenX,maxScreenX), 
                    clamp(screenY,minScreenY,maxScreenY));
            //end CHANGED
        }
        endDrag();

这里呢

    case MotionEvent.ACTION_MOVE:
        // Update the drag view.  Don't use the clamped pos here so the dragging looks
        // like it goes off screen a little, intead of bumping up against the edge.
        // **CHANGED to keep view entirely on screen
        mDragView.move(clamp(screenX,minScreenX,maxScreenX), 
                clamp(screenY,minScreenY,maxScreenY));
        // end CHANGED

    case MotionEvent.ACTION_UP:
        if (mDragging) {
            // **CHANGED to keep view entirely on screen
            drop(clamp(screenX,minScreenX,maxScreenX), 
                    clamp(screenY,minScreenY,maxScreenY));
            //end CHANGED
        }
        endDrag();

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如果要在页面中显示图像，请使用以下代码：

       <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:orientation="vertical" >

     <ImageView
        android:id="@+id/image"
        android:layout_width="match_parent"
         android:layout_height="match_parent"
        android:padding="2px"
        android:src="pathOfImage" />

     </LinearLayout>

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你应该接受其中一个答案。