android gridlayout未显示在模拟器API 22中 [英] android gridlayout not showing in emulator API 22

问题描述

我有一个应用程序，该应用程序在运行API 23的实际设备Nexus 6P和仿真的6P，5& 4运行API 24，但在模拟的Nexus 5&上显示奇怪的行为wrt GridLayout 4个正在运行的API22。

I have an app that functions exactly as desired on an actual device Nexus 6P running API 23 and an emulated 6P, 5 & 4 running API 24, but is showing odd behaviour wrt GridLayout on emulated Nexus 5 & 4 running API 22.

该应用只有一个活动，其中有多个 RelativeLayout s通过编程方式设置为 .VISIBLE & 。看不见。在一个这样的 RelativeLayout 中，我有2个 GridLayout ，如下所示。模拟API 22时，底部 GridLayout 不会显示，但顶部API始终显示，而与API 22、23或24无关。底部 GridLayout 仅在将模拟器设置更改为API 24时才显示（没有尝试过23）。为什么会这样呢？我认为我没有在 GridLayout 上使用任何需要API 23或更高版本的东西。这个问题意味着我无法在运行API 22或21的Nexus 5上安装此应用。

The app only has a single activity with multiple RelativeLayouts that are programmatically set .VISIBLE & .INVISIBLE. In one such RelativeLayout I have 2 GridLayouts as follows. When emulating API 22, the bottom GridLayout does not show but the top one always does irrespective of API 22, 23 or 24. The bottom GridLayout only shows when I change the emulator setting to API 24 (haven't tried 23). Why might that be? I don't think I'm using anything on GridLayout that requires API 23 or above. This problem means I cannot install this app on a Nexus 5 running API 22 or 21. Thanks for any suggestion.

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/gameOperations"
    android:visibility="invisible">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/launchDisplay"
        android:gravity="center_horizontal">

        <TextView
            android:text="@string/app_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/launchTitle"
            android:textStyle="normal|bold"
            android:textSize="50dp"
            android:textAlignment="center"
            android:fontFamily="casual"
            android:textColor="@android:color/holo_blue_dark"
            android:layout_marginTop="15dp"
            android:layout_weight="1" />

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:srcCompat="@drawable/brain_orig_crop_500"
            android:id="@+id/launchImage"
            android:scaleType="centerInside"
            android:layout_weight="2" />

        <TextView
            android:text="@string/launchSubtitle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/launchSubtitle"
            android:fontFamily="casual"
            android:textAlignment="center"
            android:textColor="@android:color/holo_blue_dark"
            android:textSize="25dp"
            android:textStyle="normal|bold"
            android:layout_weight="1"
            android:layout_marginTop="15dp" />

        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/launchControls"
            android:gravity="center_vertical"
            android:layout_weight="1">

            <Button
                android:text="@string/debug"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/launchSpacerLeft"
                android:layout_weight="1"
                android:background="@color/colourTransparent"
                android:textSize="15dp"
                android:fontFamily="casual"
                android:textAllCaps="false"
                android:visibility="invisible" />

            <Button
                android:text="@string/launchStart"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/launchStart"
                android:textColor="@android:color/holo_green_dark"
                android:textSize="38dp"
                android:textStyle="normal|bold"
                android:onClick="prepareNewGame"
                android:layout_weight="3"
                android:background="@color/colourTransparent"
                android:fontFamily="casual"
                android:textAllCaps="false" />

            <Button
                android:text="@string/layoutNormal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/launchSpacerRight"
                android:layout_weight="1"
                android:textAllCaps="false"
                android:background="@color/colourTransparent"
                android:fontFamily="casual"
                android:textSize="15dp" />

        </LinearLayout>

    </LinearLayout>

    <GridLayout
        android:layout_width="match_parent"
        android:id="@+id/header"
        android:columnCount="6"
        android:rowCount="4"
        android:layout_height="168dp"
        android:useDefaultMargins="true"
        android:layout_alignParentTop="true">

        <ImageView
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:srcCompat="@drawable/brain_orig_500"
            android:id="@+id/imageBrain"
            android:layout_column="0"
            android:layout_row="0"
            android:layout_rowWeight="1"
            android:layout_rowSpan="4"
            android:layout_columnSpan="6"
            android:layout_columnWeight="1"
            android:layout_gravity="fill"
            android:scaleType="fitCenter" />

        <Button
            android:text="@string/debug"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/debug"
            android:layout_column="2"
            android:layout_row="3"
            android:layout_columnSpan="2"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:fontFamily="casual"
            android:textSize="18dp"
            android:textStyle="normal|bold"
            android:textAllCaps="false"
            android:onClick="prepareNewGame"
            android:background="@color/colourTransparent"
            android:layout_gravity="fill"
            android:paddingTop="10dp"
            android:visibility="gone" />

        <TextView
            android:text="@string/blank"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/spacerColumn"
            android:layout_column="0"
            android:layout_columnWeight="1"
            android:layout_columnSpan="2"
            android:layout_gravity="fill"
            android:layout_row="0"
            android:layout_rowSpan="3"
            android:layout_rowWeight="3" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:text="@string/timerDisplay"
            android:id="@+id/timerDisplay"
            android:layout_column="0"
            android:layout_row="3"
            android:layout_columnSpan="2"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:fontFamily="casual"
            android:textSize="30dp"
            android:textStyle="normal|bold"
            android:gravity="start"
            android:layout_gravity="fill"
            android:layout_rowSpan="1" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/rightWrongDisplay"
            android:layout_column="2"
            android:layout_row="3"
            android:layout_columnSpan="2"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:textAlignment="center"
            android:textStyle="normal|bold"
            android:textSize="28dp"
            android:fontFamily="casual"
            android:layout_gravity="fill"
            android:layout_rowSpan="1"
            android:visibility="gone" />

        <TextView
            android:text="@string/scoreDisplay"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/scoreDisplay"
            android:layout_column="4"
            android:layout_row="3"
            android:layout_columnSpan="2"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:fontFamily="casual"
            android:textStyle="normal|bold"
            android:textSize="30dp"
            android:gravity="end"
            android:layout_gravity="fill"
            android:layout_rowSpan="1" />

    </GridLayout>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:id="@+id/scoreBoard"
        android:layout_alignParentTop="false"
        android:layout_below="@+id/header"
        android:visibility="gone">

    </LinearLayout>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:id="@+id/question"
        android:layout_below="@+id/scoreBoard"
        android:layout_marginTop="15dp"
        android:gravity="center">

        <TextView
            android:text="@string/operandLeft"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/operandLeft"
            android:layout_weight="5"
            android:textSize="60sp"
            android:fontFamily="casual"
            android:textAlignment="textEnd"
            android:textStyle="normal|bold"
            android:paddingEnd="10dp"
            android:paddingStart="0dp"
            android:layout_gravity="center_vertical|end"
            android:paddingLeft="0dp"
            android:paddingRight="10dp"
            android:visibility="gone" />

        <TextView
            android:text="@string/operator"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/operator"
            android:layout_weight="1"
            android:textAlignment="center"
            android:textStyle="normal|bold"
            android:textSize="60sp"
            android:fontFamily="casual"
            android:visibility="gone" />

        <TextView
            android:text="@string/operandRight"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/operandRight"
            android:layout_weight="5"
            android:textAlignment="textStart"
            android:textStyle="normal|bold"
            android:textSize="60sp"
            android:fontFamily="casual"
            android:paddingStart="10dp"
            android:paddingEnd="0dp"
            android:layout_gravity="center_vertical|start"
            android:paddingLeft="10dp"
            android:paddingRight="0dp"
            android:visibility="gone" />

        <TextView
            android:text="@string/sampleQuestion"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/questionView"
            android:layout_weight="1"
            android:gravity="center"
            android:textSize="60dp"
            android:textStyle="normal|bold"
            android:fontFamily="casual" />

    </LinearLayout>

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:layout_below="@+id/question"
        android:layout_marginTop="10dp"
        android:id="@+id/answers"
        android:rowCount="2"
        android:columnCount="2"
        android:useDefaultMargins="true"
        android:layout_above="@+id/footer">

        <Button
            android:text="@string/answer0"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/answer0"
            android:layout_column="0"
            android:layout_row="0"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:onClick="actionAnswer"
            android:textSize="50dp"
            android:textAllCaps="false"
            android:textStyle="normal|bold"
            android:fontFamily="casual"
            android:layout_gravity="fill_horizontal"
            android:background="@color/colourTransparent" />

        <Button
            android:text="@string/answer1"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/answer1"
            android:layout_column="1"
            android:layout_row="0"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:onClick="actionAnswer"
            android:textSize="50dp"
            android:textAllCaps="false"
            android:textStyle="normal|bold"
            android:fontFamily="casual"
            android:layout_gravity="fill_horizontal"
            android:background="@color/colourTransparent" />

        <Button
            android:text="@string/answer2"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/answer2"
            android:layout_column="0"
            android:layout_row="1"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:layout_gravity="fill_horizontal"
            android:onClick="actionAnswer"
            android:textSize="50dp"
            android:textAllCaps="false"
            android:textStyle="normal|bold"
            android:fontFamily="casual"
            android:background="@color/colourTransparent" />

        <Button
            android:text="@string/answer3"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:id="@+id/answer3"
            android:layout_column="1"
            android:layout_row="1"
            android:layout_rowWeight="1"
            android:layout_columnWeight="1"
            android:layout_gravity="fill_horizontal"
            android:onClick="actionAnswer"
            android:textSize="50dp"
            android:textAllCaps="false"
            android:textStyle="normal|bold"
            android:fontFamily="casual"
            android:background="@color/colourTransparent"  />

    </GridLayout>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="25dp"
        android:id="@+id/footer"
        android:layout_marginTop="15dp"
        android:gravity="center"
        android:visibility="gone"
        android:layout_alignParentBottom="true">

        <TextView
            android:text="@string/footerText"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/footerText"
            android:layout_weight="1"
            android:gravity="center"
            android:textSize="18sp"
            android:fontFamily="casual" />

    </LinearLayout>
</RelativeLayout>

推荐答案

我也遇到了这个问题，我终于找到了通过使用 android.support.v7.widget.GridLayout 解决方案，而不仅仅是 GridLayout

I too had exactly this issue and I finally found a solution by using android.support.v7.widget.GridLayout instead of just GridLayout

我不太了解细节，但是以前版本的GridLayout似乎不支持 android：layout_columnWeight 属性，尽管它确实支持 android：layout_width 属性。假设您使用 layout_width（确实存在）将宽度设置为 0dp，然后尝试使用 columnWeight（不存在）拉伸宽度，则小部件将保持在0dp，因此不会显示。

I don't understand the details deeply but previous versions of GridLayout don't seem to support the android:layout_columnWeight property, though it does support the android:layout_width property. Given you are setting the width to "0dp" using "layout_width" (which does exist) then attempting to 'stretch' it using "columnWeight" (which does not exist) the widget remains at 0dp and thus is not shown.

要解决此问题，GridLayout的 support.v7版本允许您使用 layout_columnWeight，尽管您必须确保将 app作为与 android，例如 app：layout_columnWeight = 1 。因此，您的布局文件应显示为：

To work around this the "support.v7" version of GridLayout does allow you to use 'layout_columnWeight', though you must be sure to prefix it with 'app' as apposed to 'android', as in app:layout_columnWeight = "1". So your layout file should read:

<android.support.v7.widget.GridLayout
        android:layout_width="match_parent"
        android:id="@+id/header"
        android:columnCount="6"
        android:rowCount="4"
        android:layout_height="168dp"
        android:useDefaultMargins="true"
        android:layout_alignParentTop="true">

    <ImageView
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:srcCompat="@drawable/brain_orig_500"
            android:id="@+id/imageBrain"
            android:layout_column="0"
            android:layout_row="0"
            android:layout_rowWeight="1"
            android:layout_rowSpan="4"
            android:layout_columnSpan="6"
            app:layout_columnWeight="1"
            android:layout_gravity="fill"
            android:scaleType="fitCenter" />

    .
    . 
    .

</android.support.v7.widget.GridLayout>

关键更改是添加了 android.support.v7.widget。更改为 Gridlayout ，并将 android：layout_columnWeight = 1 更改为 app ：layout_columnWeight = 1

The critical changes being adding android.support.v7.widget. to Gridlayout and changing android:layout_columnWeight="1" to app:layout_columnWeight="1"

您还必须将要使用的gridlauout-v7版本添加到依赖项中表现。对我来说我补充了：

You will also have to add the version of gridlauout-v7 you wish to use to the dependency section of your manifest. For me I added:

compile'c​​om.android.support:gridlayout-v7:26.0.0-alpha1'

最后，如果要在样式中包括列权重，请省略 app前缀，例如：

And finally if you are wanting to include the column weight in a style then omit the 'app' prefix, as in:

<style name="button_digit" parent="button">
    <item name="android:layout_width">0dip</item>
    <item name="layout_columnWeight">1</item>
    .
    .
    .

</style>

这篇关于android gridlayout未显示在模拟器API 22中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！