Android - 创建可调整大小的视图

Question

我目前正在使用具有可移动和可调整大小的视图的仪表板.我现在的问题是我想通过触摸手势调整视图大小.因此,我想到了一个Point,我将其添加到选择视图中,可以拖动它以调整所选视图的大小.这类似于Android主屏幕上的调整大小过程.

即使经过长时间的研究,我也无法想出如何覆盖另一个具有自己的DragListener的视图的解决方案.我可以想象将选定的视图和点放入一个ViewGroup并让Point覆盖View.有人有这个问题的经验吗？先感谢您.

Answer 1

尝试跟随课程。

package mayank.com.bhaktirasamritaswami.ui.components;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.RelativeLayout;
import mayank.com.bhaktirasamritaswami.R;
public class ResizableLayout extends RelativeLayout implements View.OnTouchListener{
public static int top_margine;
public ResizableLayout(Context context) {
    super(context);
    init();
}
public ResizableLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

public void init(){
    addView(inflate(getContext(), R.layout.ui_component_resizable_layout,null));
    setOnTouchListener(this);
    dragHandle = this.findViewById(R.id.drag_handle);
}

private View dragHandle;
float downRawY;
float dY;
float height;

@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
    int action = motionEvent.getAction();
    if(action == MotionEvent.ACTION_DOWN){
        downRawY = motionEvent.getRawY();
        height = this.getMeasuredHeight();
    } else {
        View parent = (View) this.getParent();
        if(downRawY<parent.getHeight() - height + 2*dragHandle.getHeight()) {
            float rawY = motionEvent.getRawY()>20*dragHandle.getHeight()?motionEvent.getRawY():20*dragHandle.getHeight();
            MarginLayoutParams p = (MarginLayoutParams) this.getLayoutParams();
            p.topMargin = (int)rawY;
            if(p.topMargin!=0)
                this.top_margine = p.topMargin;
            this.setLayoutParams(p);
        }
    }
    return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent motionEvent){
    onTouch(this, motionEvent);
    return false;
}
}

我设计这个类仅用于垂直调整大小。您需要更改 onTouch 方法以适合您的情况。