Develop Reference

React Native: Error: Package name not found

After integrating RN into an existing Android project, I get the following error:
Error: Package name not found in /home/.../AndroidManifest.xml at Object.projectConfig (/home/.../rn_integrated_app/node_modules/#react-native-community/cli-platform-android/build/config/index.js:74:11) at Object.get project [as project]
As I understand the problem is that there is no package attribute in the relevant AndroidManifest.xml file. Since my project has many flavors, the package attribute is added dynamically, while compiling, through app/build.gradle:
def pkgDataEntry = getRightValue(packagesData, variantMap)
variant.getMergedFlavor().applicationId = pkgDataEntry.pkg
So that the final merged manifest file does have the package attribute.
The error occurs here(#react-native-community/cli-platform-android/build/config/index.js):
const packageName = userConfig.packageName || getPackageName(manifest);
if (!packageName) {
throw new Error(`Package name not found in ${manifestPath}`);
}
Is there a way to make RN read the merged manifest file?
If not, how can I modify userConfig to contain the package name? I couldn`t find anything about it in the docs.
Thank you

For me, the solution was to add the "package" tag to the manifest tag.
I didn't have to create another dummy folder.
The manifest open tag now looks like this:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.yourProjectName">

If anybody encounters the same issue, when having multiple flavors and AndroidManifest.xml files,here`s my conclusion:
RN has some kind of a bug that it requires the first folder alphabetically, in android/app/src, which has AndroidManifest.xml file,to have the package attribute. Otherwise, it will throw an error.
A simple solution would be to create a dummy folder, e.g aaa (first alphabetically) and to create AndroidManifest.xml inside of it, with the following attribute - package:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="aaa"
xmlns:tools="http://schemas.android.com/tools">
<uses-permission
android:name="android.permission.GET_ACCOUNTS"
tools:node="remove"/>
</manifest>

For me, this error start after upgrade the sdkVersion from 31 to 33 and gradle version.
I did check the changes in git, and notice that the package attribute was removed from AndroidManifest.xml.
So I did add this attribute again.
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.yourpackage">

Android Studio 6.0 merger fail

Just updated to the latest version of Android Studio and i get this error in the AndroidManifest file
Manifest merger failed : Attribute application#icon value=(#drawable/project_launcher_icon) from AndroidManifest.xml:48:9
is also present at com.github.anupcowkur:reservoir:1.1.1:6:45 value=(#drawable/ic_launcher)
Suggestion: add 'tools:replace="icon"' to element at AndroidManifest.xml:44:5 to override
I tried adding tools:replace="#drawable/ic_drawer" in my manifest but i get this error:
Error:(44, 5) tools:replace specified at line:44 for attribute tools:drawable/ic_drawer, but no new value specified
Any ideas?

Following Android Studio's suggestion and adding the following attribute tools:replace="icon" should allow it to build your app successfully, without resorting to using the old manifest merger (which isn't a very forward-looking solution indeed).
Of course, you'll first have to declare the namespace "tools" in order to use it:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.sample.app" >

You should add tools:replace="icon", just like the error message says.
Additional attributes can be replaced using the syntax tools:replace="icon,name,theme"

look here:
All markers belong to the Android tools namespace, therefore you must declare the namespace in any AndroidManifest.xml containing at least one marker :
xmlns:tools="http://schemas.android.com/tools"
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.tests.flavorlib.app"
**xmlns:tools="http://schemas.android.com/tools"**>
<application
android:icon="#drawable/icon"
android:label="#string/app_name"
**tools:replace=”icon, label”**/>
</manifest>
you should add xlms:tools and tools:replace those two lines in manifest file.

Android Studio 0.6 use the new manifest merger tool. This new merger was introduced in version 0.10 of the plugin. As of 0.11, this tool is used by default by the gradle plugin.
In order to revert to the old manifest merger, please add to your build.gradle the following configuration :
android {
useOldManifestMerger true
}

For me this worked. Try adding the code in the main module(project) manifest file:
add
xmlns:tools="http://schemas.android.com/tools" in your manifest tag
add
tools:replace="android:icon,android:label,android:theme" in your application tag
These will let Android Studio know that the icon, label and theme to be used are from that manifest and not from other projects included.

Get applications package name

I am using Xamarin. I need to get the Google Maps API key and to do this I need my application's package name. How do I get this?
My app is called SimpleMapDemo and is one of the samples for using Google Maps.

Open your Manifest file and you shall find the package name of your application from the <manifest> tag.
Below is an example:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.recorder"
android:versionCode="1"
android:versionName="1.0" >
In the above example my applications package name is: com.example.recorder

Namespace is not Bound in Android Studio

If I create a new XML-file (using the default Android Studio "Create Linear Layout"), Studio makes a file with content:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
</LinearLayout>
If I (right)-click "Analyze... → Inspect Code" the result window throws 2 times:
"Namespace is not bound" and references to line 3 and 7 (the LinearLayout-tags). Is it a bug in Studio?

If you get the error:
Namespace 'tools' is not bound:
Example:
<activity
android:name="com.google.android.gms.ads.AdActivity"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
tools:replace="android:theme"
/>
Add xmlns:tools="http://schemas.android.com/tools" at the top of the manifest (or activity).
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mypackage"
xmlns:tools="http://schemas.android.com/tools">

You must copy everything except the first line <?xml version="1.0" encoding="utf-8"?> from your xml file, create a new xml layout file and erase everything but the first line, then paste the copied content into the new file below the first line. Then you use the new layout file instead of the old one.
Note: This is just my interpretation of leo's answer, I don't know if it works or not and cannot test it because I don't have the same problem as you guys.

try this:
in android studio 2.2.3 press F2 to jump between the warning then press Alt+Enter; this created the following reference:
xmlns:app="http://schemas.android.com/apk/res-auto"
and fixed the issue.
Moreover, I checked my XML files and all have this encoding version:
?xml version="1.0" encoding="utf-8"?

Add:
xmlns:app="http://schemas.android.com/apk/res-auto"
to yor manifest tag

I just added in the xml on the root widget this line:
xmlns:tools="http://schemas.android.com/tools"
An example of this is:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_height="match_parent"
android:layout_width="match_parent">
then you can use attributes like:
tools:text="+52"

Issues while generating the R file

I have some issues while generating the R file in android. I have two packages in my src folder com.mydomain and net.mydomain. Now only the net.mydomain.R file is generated not com.mydomain.R file as a result. the java files in my com.mydomain cannot access the ids like R.id R.layout. It is only populating for net.mydomain. So how can I generate com.mydomain.R file as well. Thanks

Be sure that the package you're using is the same that is in the manifest, check the line package, for example, in your case the package is com.mydomain, so:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mydomain"
android:versionCode="1"
android:versionName="1.0" >
Why not adding the net.mydomain like, com.mydomain.net?, using that way, you can solve your issue.