Develop Reference

Can I use a Flow helper with RadioButtons?

I found the following post on SO regarding constraint layout flow helpers ConstraintLayout Flow helper example and wondered if they could be used with radio buttons.
I can find little about using flow helpers anywhere.
I tried adding the following to my layout inside the RadioGroup.
<androidx.constraintlayout.helper.widget.Flow
android:id="#+id/flow1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:padding="10dp"
app:constraint_referenced_ids="radioButton, radioButton2, radioButton3"
app:flow_horizontalBias="0"
app:flow_horizontalGap="10dp"
app:flow_horizontalStyle="packed"
app:flow_verticalBias="0"
app:flow_wrapMode="chain"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
When I try to run the app I get the following errors:
Android resource linking failed
C:\AndroidProjects\MyApp\app\src\main\res\layout\activity_main.xml:158: error: attribute flow_horizontalBias (aka com.domain.myapp:flow_horizontalBias) not found.
C:\AndroidProjects\MyApp\app\src\main\res\layout\activity_main.xml:158: error: attribute flow_horizontalGap (aka com.domain.myapp:flow_horizontalGap) not found.
C:\AndroidProjects\MyApp\app\src\main\res\layout\activity_main.xml:158: error: attribute flow_horizontalStyle (aka com.domain.myapp:flow_horizontalStyle) not found.
C:\AndroidProjects\MyApp\app\src\main\res\layout\activity_main.xml:158: error: attribute flow_verticalBias (aka com.domain.myapp:flow_verticalBias) not found.
C:\AndroidProjects\MyApp\app\src\main\res\layout\activity_main.xml:158: error: attribute flow_wrapMode (aka com.domain.myapp:flow_wrapMode) not found.
error: failed linking file resources.

Use constraintlayout:2.0.0-alpha5 in gradle
Refer Flow

Yes, you can use ConstraintLayout (and Flow) to arrange RadioButton, but you have to use a ConstraintLayout aware RadioGroup widget to manage RadioButton widgets.
Please visit https://github.com/samlu/ConstraintRadioGroup.
The blRadioGroup widget should be what you are looking for.

Compiler is showing this "error: failed linking file resources."

Compiler is showing Error in these lines: I can't seems to locate the problem kindly help me.
<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_toRightOf="#id/ic_magnify"
android:layout_centerVertical="true"
android:textSize="15sp"
android:textColor="#000"
android:id="#+id/input_search"
android:background="null"
android:hint="Enter Address, City or Zip Code"
android:imeOptions="actionSearch" />

android:background="null" doesn't mean anything. You need to use android:background="#null".
In the future showing your actual error (likely something similar to the error below) will help people actually be able to help you, instead of guessing.
fragment_dashboard.xml:219: error: 'null' is incompatible with attribute background (attr) reference|color

Regular build works fine, but signed build errors on EXPECTED RESOURCE OF TYPE ID

When I build my app regularly, it builds with no errors. When I try to build the SIGNED APK, I get an error...
Error: Expected resource of type id [ResourceType]
The line of code that is flagged is...
tv = (TextView)myView.findViewById(R.id.tvTimestamp);
That ID is defined in the corresponding layout xml as follows:
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
>
<!-- Clock -->
<ImageView
android:layout_width="12dp"
android:layout_height="12dp"
android:src="#drawable/ic_clock_white"
android:layout_gravity="center_vertical"
/>
<TextView
android:id="#+id/tvTimestamp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textSize="14sp"
android:layout_marginLeft="20dp"
/>
</FrameLayout>
Not sure why this one is erroring out.
Thanks
Pete

That is not a compiler error, it's a lint warning.
To solve it, try one of the following:
Clean your project and sync it again
Use View.generateViewId() to set an arbitrary id
Create an ids.xml file in res/values/
If the debug version is running correctly on the emulator/physical device then you can safely go ahead and suppress this warning by:
Clicking on the error and selecting Disable error
Adding the following lines in build.gradle
android {
lintOptions{
disable "ResourceType"
}
}

Android: importing projects/libraries?

I am trying to use code from a project that I downloaded from Github, however I am consistently getting errors.
Is there more steps needed to use a project than importing it into eclipse?
I am currently just copying and pasting code from the downloaded project to mine.
Attempting to use the following:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res/com.mikhaellopez.circularimageviewsample"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical" >
<com.mikhaellopez.circularimageview.CircularImageView
android:layout_width="250dp"
android:layout_height="250dp"
android:src="#drawable/image"
app:border="true"
app:border_color="#color/GrayLight"
app:border_width="4dp"
app:shadow="true" />
</LinearLayout>
But getting the error:
Multiple annotations found at this line:
- error: No resource identifier found for attribute 'border_color' in package
'com.mikhaellopez.circularimageviewsample'
- error: No resource identifier found for attribute 'shadow' in package
'com.mikhaellopez.circularimageviewsample'
- error: No resource identifier found for attribute 'border' in package
'com.mikhaellopez.circularimageviewsample'
- error: No resource identifier found for attribute 'border_width' in package
'com.mikhaellopez.circularimageviewsample'

Is there more steps needed to use a project than importing it into eclipse?
Well, that depends.
I am currently just copying and pasting code from the downloaded project to mine.
Depending upon how that code is written, that may not work well.
But getting the error:
Change:
xmlns:app="http://schemas.android.com/apk/res/com.mikhaellopez.circularimageviewsample"
to:
xmlns:app="http://schemas.android.com/apk/res-auto"
as your app does not have the package name of com.mikhaellopez.circularimageviewsample, apparently.

No Resource Identifier Found for Attribute textIsSelectable repeateadly occurs

I use Eclipse 4.3.0 with the latest Android SDK.
I have a textview which looks like this:
<TextView
android:id="#+id/list_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:onClick="onSave"
android:textIsSelectable="false"
android:textAppearance="?android:attr/textAppearanceLarge" />
I added the line android:textIsSelectable="false" manually because lint gave me a warning and I hate to have warnings. The warning goes away. However, as soon as I edit something in the layout, an error appears saying:
error: No resource identifier found for attribute 'textIsSelectable' in package 'android'
I have to go to the file, remove the line, the error disappears and the warning returns. Then I reinsert the line again, and the error AND the warning is gone, until next time I have to edit something.
This property is also not showing up anywhere in the editor screen, so maybe that is the reason, but then, how can I get rid permanently of this error loop? Or is this a bug in the SDK environment?