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.
The app only has a single activity with multiple RelativeLayout
s that are programmatically set .VISIBLE
& .INVISIBLE
. In one such RelativeLayout
I have 2 GridLayout
s 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>
I too had exactly this issue and I finally found a solution by using
android.support.v7.widget.GridLayout
instead of justGridLayout
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 theandroid: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.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:The critical changes being adding
android.support.v7.widget.
toGridlayout
and changingandroid:layout_columnWeight="1"
toapp:layout_columnWeight="1"
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 'com.android.support:gridlayout-v7:26.0.0-alpha1'
And finally if you are wanting to include the column weight in a style then omit the 'app' prefix, as in: