Question

首先，我阅读了类似的问题，并尝试了所有建议的解决方案。这些解决方案包括：

使缓存无效并重新启动
与gradle同步
重新启动Android Studio
清理并构建
在“启动器”部分将配置更改为“无”
将清单文件上的android：name更改为完整的包名称（例如：com.example.acer.alertbox.ActivityName）

这些解决方案似乎都不起作用，而且我不断收到错误消息，指出“未找到默认活动”。我已经尝试解决了一个星期，所以我希望有人会给我一个新的解决方案，除了上面提到的那六个。下面是我的android清单代码，对我来说似乎不错，我已经检查了多次。

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

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>

    <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"
            tools:ignore="GoogleAppIndexingWarning">

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

        <activity
                android:name=".LoginActivity"
                android:parentActivityName=".MainActivity">
        </activity>
        <activity
                android:name=".RegisterActivity"
                android:parentActivityName=".MainActivity">
        </activity>
        <activity
                android:name=".SendActivity"
                android:parentActivityName=".MainActivity">
        </activity>
        <activity
                android:name=".Profile"
                android:parentActivityName=".MainActivity">
        </activity>
        <activity android:name=".NotificationActivity">
                  <intent-filter>
                      <action android:name="com.example.acer.alertbox.TARGETNOTIFICATION">
                      </action>
                  </intent-filter>
        </activity>

        <service
            android:name=".FirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT">
                </action>
            </intent-filter>
        </service>

        <meta-data
                android:name="com.google.firebase.messaging.default_notification_channel_id"
                android:value="@string/default_notification_channel_id" />


    </application>

</manifest>

已更新：我已经卸载并重新安装了Android Studio，问题已解决，但又出现了一个问题。单击“运行”按钮时，它没有执行任何操作，并且在右下角显示警告，提示内部IDE错误：无法找到adb。我已经下载了adb文件，并将其放在此目录C：/ Acer / Users / Local / Sdk中，但仍然没有任何改变。我还重新启动，同步了项目gradle文件等，但没有任何效果！请有人帮我。以下是我从内部错误报告中获得的信息：

Unable to locate adb
java.lang.IllegalArgumentException: Unable to locate adb
    at com.android.tools.idea.run.editor.DeployTargetPickerDialog.<init>(DeployTargetPickerDialog.java:131)
    at com.android.tools.idea.run.editor.ShowChooserTargetProvider.showPrompt(ShowChooserTargetProvider.java:113)
    at com.android.tools.idea.run.AndroidRunConfigurationBase.getDeployTarget(AndroidRunConfigurationBase.java:605)
    at com.android.tools.idea.run.AndroidRunConfigurationBase.getState(AndroidRunConfigurationBase.java:287)
    at com.intellij.execution.runners.ExecutionEnvironment.getState(ExecutionEnvironment.java:158)
    at com.intellij.execution.runners.BaseProgramRunner.execute(BaseProgramRunner.java:55)
    at com.intellij.execution.runners.BaseProgramRunner.execute(BaseProgramRunner.java:50)
    at com.intellij.execution.ProgramRunnerUtil.executeConfigurationAsync(ProgramRunnerUtil.java:97)
    at com.intellij.execution.ProgramRunnerUtil.executeConfiguration(ProgramRunnerUtil.java:44)
    at com.intellij.execution.impl.ExecutionManagerImpl.start(ExecutionManagerImpl.java:111)
    at com.intellij.execution.impl.ExecutionManagerImpl.access$300(ExecutionManagerImpl.java:59)
    at com.intellij.execution.impl.ExecutionManagerImpl$3.run(ExecutionManagerImpl.java:439)
    at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:231)
    at com.intellij.util.Alarm$Request.runSafely(Alarm.java:405)
    at com.intellij.util.Alarm$Request.access$700(Alarm.java:330)
    at com.intellij.util.Alarm$Request$1.run(Alarm.java:371)
    at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:447)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:431)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:415)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
    at java.awt.EventQueue.access$500(EventQueue.java:98)
    at java.awt.EventQueue$3.run(EventQueue.java:715)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
    at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:822)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:763)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:423)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

最新更新：通过从Avast防病毒软件还原adb.exe解决了问题。

Answer 1

这是您可以检查的一些可能原因

是否有任何活动被删除但仍然存在于清单中
在意图过滤器中添加此标签，并检查其是否有效
```
<category android:name="android.intent.category.DEFAULT"/>
```
检查配置选项卡是否正确配置以获取更多详细信息，请单击链接 Error: Default Activity Not Found

在Android清单文件中设置活动后，该如何解决“未找到默认活动”的问题？

1 个答案: