Android拖放startDragAndDrop拖拽onDrawShadow静态添加xml布局View，Kotlin（4）

分手后的思念是犯贱 2024-02-21 11:51 34阅读 0赞

### Android拖放startDragAndDrop拖拽onDrawShadow静态添加xml布局View，Kotlin（4） ###

import android.content.ClipData
    import android.graphics.Canvas
    import android.graphics.Point
    import android.os.Bundle
    import android.util.Log
    import android.view.DragEvent
    import android.view.LayoutInflater
    import android.view.View
    import android.view.View.OnDragListener
    import android.view.View.OnLongClickListener
    import android.widget.ImageView
    import androidx.appcompat.app.AppCompatActivity
    
    
    class MainActivity : AppCompatActivity() {
        private val TAG = "fly"
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
    
            val imageView = findViewById<ImageView>(R.id.image)
    
            val shadow = LayoutInflater.from(this).inflate(R.layout.dnd, null)
    
            val builder = MyDragShadowBuilder(shadow)
            imageView.setOnLongClickListener(object : OnLongClickListener {
                //长按事件触发拖拽
                override fun onLongClick(v: View?): Boolean {
                    val data = ClipData.newPlainText("name", "phil")
                    imageView.startDragAndDrop(
                        data,
                        builder,
                        null,
                        0 or View.DRAG_FLAG_GLOBAL or View.DRAG_FLAG_OPAQUE
                    )
    
                    return true
                }
            })
    
            imageView.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")
                        }
    
                        DragEvent.ACTION_DRAG_ENTERED -> { //进入imageView
                            Log.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imageView
                            Log.d(TAG, "ACTION_DRAG_EXITED")
                        }
                    }
    
                    return true
                }
            })
        }
    
        class MyDragShadowBuilder(private var mShadow: View) :
            View.DragShadowBuilder() {
            private val width: Int = 400
            private val height: Int = 400
    
            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)
            }
        }
    }

<?xml version="1.0" encoding="utf-8"?>
    <androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:cardBackgroundColor="@android:color/holo_green_light"
        app:cardCornerRadius="20dp"
        app:cardElevation="0dp">
    
        <ImageView
            android:id="@+id/image"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:scaleType="centerCrop"
            android:src="@android:drawable/stat_notify_error" />
    
        <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="top|right"
            android:layout_margin="10dp"
            android:background="@android:color/holo_blue_light"
            android:text="999"
            android:textColor="@android:color/holo_red_dark"
            android:textSize="15dp" />
    
    </androidx.cardview.widget.CardView>

![dc6455fe40e648f9add1ccf77a66aef5.png][]

[Android拖放startDragAndDrop拖拽onDrawShadow动态添加View，Kotlin（3）-CSDN博客文章浏览阅读161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。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/134015999][Android_startDragAndDrop_onDrawShadow_View_Kotlin_3_-CSDN_161_Android DynamicGrid_Android DynamicGrid_DynamicGrid_github_https_github.com_askerov_DynamicGrid_view_android _Android View_startDragAndDrop_Kotlin-CSDN_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_134015999]

[Android View拖拽startDragAndDrop，Kotlin-CSDN博客一个Android手势缩放图片的工具类；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。但是还有一些遗漏问题尚未解决：垂直方向的拖曳。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/133994955][Android View_startDragAndDrop_Kotlin-CSDN_Android_Android DynamicGrid_Android DynamicGrid_DynamicGrid_github_https_github.com_askerov_DynamicGrid_view_android _favicon32.ico_https_blog.csdn.net_zhangphil_article_details_133994955]

[dc6455fe40e648f9add1ccf77a66aef5.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/e213ebfec9e4437dac1febc7226360ec.png
[favicon32.ico]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/21/9a74f96a709f4e939bcf54f9257afdbc.png
[Android_startDragAndDrop_onDrawShadow_View_Kotlin_3_-CSDN_161_Android DynamicGrid_Android DynamicGrid_DynamicGrid_github_https_github.com_askerov_DynamicGrid_view_android _Android View_startDragAndDrop_Kotlin-CSDN_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_134015999]: https://blog.csdn.net/zhangphil/article/details/134015999
[Android View_startDragAndDrop_Kotlin-CSDN_Android_Android DynamicGrid_Android DynamicGrid_DynamicGrid_github_https_github.com_askerov_DynamicGrid_view_android _favicon32.ico_https_blog.csdn.net_zhangphil_article_details_133994955]: https://blog.csdn.net/zhangphil/article/details/133994955