android - 在我在 android 中触摸的位置在 GestureOverlayView 中添加一个孩子？

Question

如何在我在该视图中触摸的位置在手势覆盖视图中添加子项（布局）.....是否可以根据位置的坐标定位它？

Answer 1

对于 API 11 (Android 3.0.x) 及更高版本：您可以使用View.setX()和View.setY()。有关详细信息，请参阅API 文档。

对于所有 API 版本：您可以使用RelativeLayout和RelativeLayout.Layout。特别是通过在继承自的字段中设置边距ViewGroup.MarginLayoutParams。我想它会是这样的：

RelativeLayout parentLayout = (RelativeLayout) findViewById(R.id.relative_layout);

LinearLayout newLayout = new LinearLayout(this); // or some other layout

RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
    // You can enter layout absolute dimensions here instead of 'wrap_content'.
    ViewGroup.LayoutParams.WRAP_CONTENT,
    ViewGroup.LayoutParams.WRAP_CONTENT);
// Set your X and Y position here for new layout.
layoutParams.setMargins(100 /*left*/, 200 /*top*/, 0 /*right*/, 0 /*bottom*/); 
parentLayout.addView(newLayout , layoutParams);

Answer 2

public boolean onTouchEvent(MotionEvent event) {
    TextView tv=new TextView(this);

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
    case MotionEvent.ACTION_MOVE:
    case MotionEvent.ACTION_UP:
        x = event.getX();
        y = event.getY();
        RelativeLayout gh = (RelativeLayout) findViewById(R.id.relative1);
        RelativeLayout.LayoutParams para = new RelativeLayout.LayoutParams(150, 50); //Size of textView
        para.leftMargin = (int) x;  //location of textview
        para.topMargin = (int) y;
        tv.setLayoutParams(para);

        tv.setText("You have Touched at  "+x+" ,"+y);
        change();
        gh.addView(tv);
    }