Android 几行代码实现通用缺省图

Activity中使用

• 资源加载失败，显示缺省图

fun goneLayout(activity: Activity, ids: IntArray, text: String, res: Int = R.mipmap.no, state: Int = View.GONE) {
        val viewGroup: ViewGroup = activity.findViewById(android.R.id.content)
        if (viewGroup.tag != null) return
        val relative: RelativeLayout = LayoutInflater.from(activity).inflate(R.layout.empty_layout, null, false) as RelativeLayout
        viewGroup.removeView(relative)
        viewGroup.addView(relative)
        if (res == 0) {
            relative.EmptyLayout_img.visibility = View.GONE
        } else {
            relative.EmptyLayout_img.visibility = View.VISIBLE
            Glide.with(activity).load(res).into(relative.EmptyLayout_img)
        }
        relative.EmptyLayout_text.also {
            if (text.isEmpty())
                it.visibility = state
            else {
                it.visibility = View.VISIBLE
                it.text = text
            }
        }
        ids.forEach {
            activity.findViewById<View>(it).visibility = View.GONE
        }
        viewGroup.tag = relative
    }

• 缺省图移除

  fun visibleLayout(activity: Activity, ids: IntArray) {
        val viewGroup: ViewGroup = activity.findViewById(android.R.id.content)
        if (viewGroup.tag == null) {
            val relative: RelativeLayout = LayoutInflater.from(activity).inflate(R.layout.empty_layout, null, false) as RelativeLayout
            viewGroup.removeView(relative)
        } else {
            viewGroup.removeView(viewGroup.tag as View)
            viewGroup.tag = null
        }
        ids.forEach {
            activity.findViewById<View>(it).visibility = View.VISIBLE
        }
    }

Fragment中使用

• 缺省图显示 Fragment

 fun goneLayout(activity: Activity, view: View, ids: IntArray, text: String, res: Int = R.mipmap.no) {
        if (view is ViewGroup) {
            val relative: RelativeLayout = LayoutInflater.from(activity).inflate(R.layout.empty_layout, view, false) as RelativeLayout
            if (view.tag != null) return
            view.removeView(relative)
            view.addView(relative)
            layoutParamsMatchParent(relative)
            if (res == 0)
                relative.EmptyLayout_img.visibility = View.GONE
            else {
                relative.EmptyLayout_img.visibility = View.VISIBLE
                Glide.with(activity).load(res).into(relative.EmptyLayout_img)
            }
            relative.EmptyLayout_text.also {
                if (text.isEmpty())
                    it.visibility = View.GONE
                else {
                    it.visibility = View.VISIBLE
                    it.text = text
                }
            }
            ids.forEach {
                view.findViewById<View>(it).visibility = View.GONE
            }
            view.tag = relative
        }
    }

• 缺省图移除

fun visibleLayout(activity: Activity, view: View, ids: IntArray) {
        if (view is ViewGroup) {
            val relative: RelativeLayout = LayoutInflater.from(activity).inflate(R.layout.empty_layout, view, false) as RelativeLayout
            if (view.tag == null) {
                view.removeView(relative)
            } else {
                view.removeView(view.tag as View)
                view.tag = null
            }
            ids.forEach {
                view.findViewById<View>(it).visibility = View.VISIBLE
            }
        }
    }

默认空布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/EmptyLayout_Gen"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerInParent="true"
    android:layout_gravity="center">

    <ImageView
        android:id="@+id/EmptyLayout_img"
        android:layout_width="@dimen/heart_anim_length"
        android:layout_height="@dimen/heart_anim_length"
        android:layout_centerInParent="true"
        tools:ignore="ContentDescription"/>

    <TextView
        android:id="@+id/EmptyLayout_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/EmptyLayout_img"
        android:layout_centerInParent="true"
        android:layout_marginTop="@dimen/dp_5"
        android:textColor="@color/black_434343"
        android:textSize="@dimen/sp_15"/>

</RelativeLayout>