AndroidManifest.xml 中的“未解析类”错误

Question

I get an error in my manifest xml file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.shaikhaalothman.playsongservice">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name=".PlaySongService"
            android:enabled="true"
            android:exported="true"></service>
    </application>

</manifest>

and it gives me an error at this line:

 android:name=".PlaySongService"

and the error reads:

Unresolved class 'PlaySongService'

Validates resource reference inside Android XML files.

I haven't found anything that helps to resolve my error here on Stackoverflow, and elsewhere. Anyone that knows what I'm doing wrong?

Answer 1

Put PlaySongService.java and MainActivity.java in the same package, named com.example.shaikhaalothman.playsongservice . It will resolve automatically.

Answer 2

Though this is an older thread, I thought I'd include my steps to resolve this issue should it help anyone:

1. Verify that the line applicationId "com.domain.packagename" in the module build.gradle file has the correct domain name entered.
2. Make sure that that this domain name matches your package name under your java folder. An easy way to update this is to go to the settings gear in the top right corner of the Project pane and uncheck "Hide empty middle packages" if it isn't, then right-click refactor-rename the folder with your domain name.
3. Finally, ensure this domain name is also correctly entered in the package tag at the top of your manifest file.

My issue was that the directory under java had the incorrect package name, so I had to change it to match the gradle and manifest files.

Answer 3

You have to include a path in your "build.gradle" file. I had the same problem as shown in the picture in the link: Unresolved class

Open the "build.gradle" file in your editor and add a path line to the dependencies, as shown below: dependencies { implementation project(path: ':theClassPathGoesHere') }

Answer 4

In my case, none of the solutions above worked because I had already checked that the package names, etc. were correct.

So I took the approach of comparing my activities to a new activity generated by Android Studio. I'm on Android Studio 3.1.3. I chose File > New Activity > Basic Activity and the first thing I discovered was the package name it defaulted was red.

I checked, and sure enough my applicationId in my module-level build.gradle file was not equal to the package name of my existing activities. I corrected that, but it didn't make the error go away.

So, I completed the process of generating the Basic Activity to ensure that I didn't get the Unresolved class error. As I expected, the AndroidManifest.xml entry generated by Android Studio did not have the error. Meanwhile my existing activities continued to have an error. So I then compared my existing activities to the generated one. I discovered that my activities extended the Activity class where as the generated one extended AppCompatActivity . So I tried changing from Activity to AppCompatActivity . This generated a bunch of errors I didn't want to deal with, so I changed them back from AppCompatActivity to Activity . And suddenly Android Studio didn't warn me about any Unresolved class errors anymore.

I'm not sure what's really going on. I thought maybe something got corrupted in my .idea directory, but wiping that out and reimporting didn't solve the problem.

In summary, what seems to eliminate the Unresolved class error is: change your activity's java file from extending Activity to extend AppCompatActivity and then change it back to Activity . That resolved the errors for me.

Answer 5

在 android:name="____" 的 android manifest 文件中，我的包名是错误的，所以从包中声明的清单文件的顶部复制我的包名：“____”解决了我的错误

Answer 6

使用 Shift+F6 将 AndroidManifest.xml 中的包从“com.example.loa”重命名为“com.example1.loa”……然后将包从“com.example1.loa”反向重命名为“com.example.loa” ...这将解决问题，因为Android Studio会用新名称重建项目，然后用旧名称重建项目...

Answer 7

唯一对我File > Invalidate Caches / Restart是File > Invalidate Caches / Restart 。

Answer 8

you should check your package within the java activity. clear the package name and rewrite it according to your project. example- package com.app.gmail

Answer 9

For me it resolved for me by changing: @mipmap/logo1.jpeg to @mipmap/ic_launcher back again.