Android 应用程序没有'；不要在低于棉花糖的地方展示任何东西。在棉花糖及以上，效果很好

我正在使用Gridlayout构建ImageView和TextView的平铺。该应用程序在安卓6.0上运行良好。但在不到6.0的版本中，该应用程序只显示一个空白的白色屏幕。请帮帮我。谢谢

这是xml文件

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.mrvirk.urduapp.MainActivity"
android:weightSum="8">


<GridLayout


    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnCount="2"
    android:rowCount="4">

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@color/green3"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_margin="1dp"
        >

            <ImageView
                android:id="@+id/learning"
                android:layout_width="match_parent"
                android:layout_height="@android:dimen/notification_large_icon_width"
                android:scaleType="fitCenter"
                android:src="@drawable/learning"
                android:layout_gravity="center"
                />


        <TextView
            android:id="@+id/txtLearning"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Learning"
            android:textColor="@color/white"
            android:textStyle="bold" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@color/yellow"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_margin="1dp"
        >


            <ImageView
                android:id="@+id/acheivements"
                android:layout_width="match_parent"
                android:layout_height="@android:dimen/notification_large_icon_width"
                android:scaleType="fitCenter"
                android:src="@drawable/acheivements"

                />


        <TextView
            android:id="@+id/txtAcheivements"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Acheivements"
            android:textColor="@color/white"
            android:textStyle="bold" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_columnSpan="2"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:background="@color/red"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_margin="1dp"
        >

        <ImageView
            android:id="@+id/quiz"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scaleType="fitCenter"
            android:src="@drawable/quiz" />

        <TextView
            android:id="@+id/txtQuiz"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Quiz"
            android:textColor="@color/white"
            android:textStyle="bold" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@color/blue2"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_margin="1dp"
        >

        <ImageView
            android:id="@+id/setting"
            android:layout_width="match_parent"
            android:layout_height="@android:dimen/notification_large_icon_width"
            android:scaleType="fitCenter"
            android:src="@drawable/setting" />

        <TextView
            android:id="@+id/txtSetting"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Setting"
            android:textColor="@color/white"
            android:textStyle="bold" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@color/tea"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_margin="1dp"
        >

        <ImageView
            android:id="@+id/share"
            android:layout_width="match_parent"
            android:layout_height="@android:dimen/notification_large_icon_width"
            android:scaleType="fitCenter"
            android:src="@drawable/share" />

        <TextView
            android:id="@+id/txtshare"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Share"
            android:textColor="@color/white"
            android:textStyle="bold" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@color/org"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_margin="1dp"
        >

        <ImageView
            android:id="@+id/about"
            android:layout_width="match_parent"
            android:layout_height="@android:dimen/notification_large_icon_width"
            android:scaleType="fitCenter"
            android:src="@drawable/about" />

        <TextView
            android:id="@+id/txtAbout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="About"
            android:textColor="@color/white"
            android:textStyle="bold" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="@color/green3"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_margin="1dp"
        >

        <ImageView
            android:id="@+id/moreApps"
            android:layout_width="match_parent"
            android:layout_height="@android:dimen/notification_large_icon_width"
            android:scaleType="fitCenter"
            android:src="@drawable/moreapps" />

        <TextView
            android:id="@+id/txtMoreApps"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="More Apps"
            android:textColor="@color/white"
            android:textStyle="bold" />

    </LinearLayout>
</GridLayout>

---

您正在使用如下属性：

    android:layout_columnWeight="1"
    android:layout_rowWeight="1"

仅适用于api>=21

确保你的成绩是：

implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:gridlayout-v7:27.1.1'

或以后
在xml中，将

GridLayout

标记替换为

android.support.v7.widget.GridLayout

只需在xml的末尾添加

，然后检查

android.support.v7.widget.GridLayout