Question

我在TextView上使用了拖放功能，但是确实有效，但是当我将TextView放在触摸的准确x和y位置（文本视图居中）时，我没有意识到TextView在左上轴的x和y startof上，是因为这样我的放下无法按预期方式工作...当我放下时，如何更改TextView轴居中或使他居中他吗？

它的作用： https://gph.is/2yxoPv9

我的代码：

class MainActivity : AppCompatActivity(), View.OnLongClickListener, View.OnDragListener {

    private val TAG = MainActivity::class.java.getSimpleName()
    private var llPinkLayout: RelativeLayout? = null
    private var tvDragView: TextView? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setUpViews();
        setListeners();
    }

    private fun setListeners() {
        tvDragView?.setOnLongClickListener(this)
        llPinkLayout?.setOnDragListener(this)
    }

    private fun setUpViews() {
        llPinkLayout = findViewById<View>(R.id.ll_pinklayout) as RelativeLayout
        tvDragView = findViewById<View>(R.id.tv_dropdrop) as TextView
    }

    override fun onDrag(view: View, dragEvent: DragEvent): Boolean {
        Log.d(TAG, "onDrag: view->$view\n DragEvent$dragEvent")
        when (dragEvent.action) {
            DragEvent.ACTION_DRAG_ENDED -> {
                Log.d(TAG, "onDrag: ACTION_DRAG_ENDED ")
                return true
            }
            DragEvent.ACTION_DRAG_EXITED -> {
                Log.d(TAG, "onDrag: ACTION_DRAG_EXITED")
                return true
            }
            DragEvent.ACTION_DRAG_ENTERED -> {
                Log.d(TAG, "onDrag: ACTION_DRAG_ENTERED")
                return true
            }
            DragEvent.ACTION_DRAG_STARTED -> {
                Log.d(TAG, "onDrag: ACTION_DRAG_STARTED")
                return true
            }
            DragEvent.ACTION_DROP -> {
                Log.d(TAG, "onDrag: ACTION_DROP")
                val tvState = dragEvent.localState as View
                Log.d(TAG, "onDrag:viewX" + dragEvent.x + "viewY" + dragEvent.y)
                Log.d(TAG, "onDrag: Owner->" + tvState.parent)
                val tvParent = tvState.parent as ViewGroup
                tvParent.removeView(tvState)
                val container = view as RelativeLayout
                container.addView(tvState)
                val contariner = view
                tvParent.removeView(tvState)
                tvState.x = dragEvent.x //the problem are there!
                tvState.y = dragEvent.y //the problem are there!
                view.addView(tvState)
                view.setVisibility(View.VISIBLE)
                return true
            }
            DragEvent.ACTION_DRAG_LOCATION -> {
                Log.d(TAG, "onDrag: ACTION_DRAG_LOCATION")
                return true
            }
            else -> return false
        }
    }

    override fun onLongClick(v: View?): Boolean {
        val dragShadowBuilder = View.DragShadowBuilder(v)
        v?.startDrag(null, dragShadowBuilder, v, 0)
        return true
    }

}

Answer 1

我已解决此问题，为此更改了x和y行：

DragEvent.ACTION_DROP -> {
                Log.d(TAG, "onDrag: ACTION_DROP")
                val tvState = dragEvent.localState as View
                Log.d(TAG, "onDrag:viewX" + dragEvent.x + "viewY" + dragEvent.y)
                Log.d(TAG, "onDrag: Owner->" + tvState.parent)
                val tvParent = tvState.parent as ViewGroup
                tvParent.removeView(tvState)
                val container = view as RelativeLayout
                container.addView(tvState)
                val contariner = view
                tvParent.removeView(tvState)
                tvState.x = dragEvent.x - tvState.width/2  // FIXED
                tvState.y = dragEvent.y - tvState.height/2 // FIXED
                view.addView(tvState)
                view.setVisibility(View.VISIBLE)
                return true
            }

我通过(touch x position) - (TextView width)/2设置了TextView x

我通过(touch y position) - (TextView height)/2设置了TextView y

这样我就可以将TextView对准精确的触摸位置！

将文本视图放在文本中心

1 个答案: