Android拖放startDragAndDrop拖拽Glide加载堆叠圆角图，Kotlin（5）

Android拖放startDragAndDrop拖拽Glide加载堆叠圆角图，Kotlin（5）

import android.content.ClipDataimport android.graphics.Canvasimport android.graphics.Pointimport android.os.Bundleimport android.util.Logimport android.view.DragEventimport android.view.LayoutInflaterimport android.view.Viewimport android.view.View.OnDragListenerimport android.view.View.OnLongClickListenerimport android.view.ViewGroupimport android.widget.ImageViewimport android.widget.TextViewimport androidx.appcompat.app.AppCompatActivityimport com.bumptech.glide.load.resource.bitmap.CenterCropimport com.bumptech.glide.load.resource.bitmap.RoundedCornersclass MainActivity : AppCompatActivity() {companion object {const val TAG = "fly"const val DEGREE = -10 //图片选择的角度。const val RADIUS = 30 //图片的圆角半径。}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val shadowBuilder = createDragShadowBuilder()setData(shadowBuilder.getShadowView())val triggerView = findViewById(R.id.image)triggerView.setOnLongClickListener(object : OnLongClickListener {//长按事件触发拖拽.override fun onLongClick(v: View?): Boolean {val data = ClipData.newPlainText("name", "phil") //测试数据。triggerView.startDragAndDrop(data,shadowBuilder,null,0 or View.DRAG_FLAG_GLOBAL or View.DRAG_FLAG_OPAQUE)return true}})triggerView.setOnDragListener(object : OnDragListener {override fun onDrag(v: View?, event: DragEvent?): Boolean {when (event?.action) {DragEvent.ACTION_DRAG_STARTED -> {//拖放开始Log.d(TAG, "ACTION_DRAG_STARTED")//updateData(shadowView)}DragEvent.ACTION_DRAG_ENTERED -> {//进入imageViewLog.d(TAG, "ACTION_DRAG_ENTERED")}DragEvent.ACTION_DRAG_ENDED -> {//拖放结束Log.d(TAG, "ACTION_DRAG_ENDED")}DragEvent.ACTION_DRAG_EXITED -> {//离开imageViewLog.d(TAG, "ACTION_DRAG_EXITED")}}return true}})}private fun createDragShadowBuilder(): MyDragShadowBuilder {val shadowView = LayoutInflater.from(this).inflate(R.layout.dnd, null)return MyDragShadowBuilder(shadowView)}private fun setData(viewGroup: View) {//从1和4两个数字中随机选一个。var cnt = intArrayOf(1, 4).random()Log.d(TAG, "cnt=$cnt")val group: androidx.constraintlayout.widget.Group = viewGroup.findViewById(R.id.group)val number = viewGroup.findViewById(R.id.number)if (cnt == 1) {//只显示一张。number.text = "1"group.visibility = ViewGroup.INVISIBLE} else if (cnt == 4) {//显示重叠在一起的4张。number.text = "4"group.visibility = ViewGroup.VISIBLEval imageViews = arrayOf(viewGroup.findViewById(R.id.iv1),viewGroup.findViewById(R.id.iv2),viewGroup.findViewById(R.id.iv3))val resIds = arrayOf(R.mipmap.pic1,R.mipmap.pic2,R.mipmap.pic3)imageViews.forEachIndexed { index, iv ->val degree = (imageViews.size - index) * DEGREELog.d(TAG, "index=$index degree=$degree")iv.rotation = degree.toFloat()GlideApp.with(this).load(resIds[index]).transform(CenterCrop(), RoundedCorners(RADIUS)) //先中心缩放，再切圆角。.override(resources.getDimensionPixelSize(R.dimen.image_size_w),resources.getDimensionPixelSize(R.dimen.image_size_h)).placeholder(R.drawable.ic_launcher_foreground).error(android.R.drawable.stat_notify_error).into(iv)}}val folder = viewGroup.findViewById(R.id.folder)//封面GlideApp.with(this).load(R.mipmap.pic4).transform(CenterCrop(), RoundedCorners(RADIUS)) //先中心缩放，再切圆角。.override(resources.getDimensionPixelSize(R.dimen.image_size_w),resources.getDimensionPixelSize(R.dimen.image_size_h)).placeholder(R.drawable.ic_launcher_foreground).error(android.R.drawable.stat_notify_error).into(folder)}class MyDragShadowBuilder(private var mShadow: View) :View.DragShadowBuilder() {private val width: Int =mShadow.context.resources.getDimensionPixelSize(R.dimen.view_size_w)private val height: Int =mShadow.context.resources.getDimensionPixelSize(R.dimen.view_size_h)fun getShadowView(): View {return mShadow}override fun onProvideShadowMetrics(outShadowSize: Point?, outShadowTouchPoint: Point?) {//拖动图像的宽和高outShadowSize?.set(width, height)//手指在拖动图像的位置 中点outShadowTouchPoint?.set(width / 2, height / 2)}override fun onDrawShadow(canvas: Canvas) {mShadow.measure(width, height)mShadow.layout(0, 0, width, height)mShadow.draw(canvas)Log.d(TAG, "onDrawShadow width=$width height=$height")}}}

只有一张图片，只显示封面图：

多张图片，显示堆叠的图片，并同时设置封面图：

dnd.xml:

dimens.xml:

250dp200dp150dp100dp50dp

Android拖放startDragAndDrop拖拽onDrawShadow静态添加xml布局View，Kotlin（4）-CSDN博客文章浏览阅读74次。Android DynamicGrid：拖曳交换位置Android DynamicGrid是一个第三方开源项目，DynamicGrid在github上的项目主页是：https://github.com/askerov/DynamicGrid它实现在一个网格布局内，拖曳任意子view实现动态的交换位置，这很类似手机的桌面，手机桌面的图标，均可自由拖曳实现摆放位置的交换，如动图所示：_android 拖拽交换位置。Android View拖拽startDragAndDrop，Kotlin-CSDN博客。https://blog.csdn.net/zhangphil/article/details/134017828