找不到明确的活动类 ；您是不是在 AndroidManifest.xml 中声明了此活动

Posted 2023-04-14

【中文标题】找不到明确的活动类 ；您是不是在 AndroidManifest.xml 中声明了此活动

【英文标题】：Unable to find explicit activity class ; have you declared this activity in your AndroidManifest.xml找不到明确的活动类 ；您是否在 AndroidManifest.xml 中声明了此活动

【发布时间】：2015-03-29 06:57:30

【问题描述】：

我正在尝试在后台解压缩一些文件，所以我使用 IntentService 就像在谷歌的教程中一样。我在 androidManifest 中声明的服务类是这样的：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.osmdroid">

<uses-sdk
    android:minSdkVersion="16"
    android:targetSdkVersion="21" />


<application
    android:configChanges="orientation|screenSize|keyboardHidden"
    android:hardwareAccelerated="true"
    android:icon="@drawable/ecn_icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >


    <activity
        android:name=".MapActivity"
        android:icon="@drawable/ecn_icon"
        android:label="test" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    <activity
        android:name=".SettingsActivity"
        android:label="@string/title_activity_settings">
    </activity>
    <service
        android:name=".UnZipService"
        android:exported="false"/>
</application>

在活动中，我有

IntentFilter intentFilter = new IntentFilter(DownloadManager
            .ACTION_DOWNLOAD_COMPLETE);

    receiverDownloadComplete = new BroadcastReceiver() 
        @Override
        public void onReceive(Context context, Intent intent) 
            long reference = intent.getLongExtra(DownloadManager
                    .EXTRA_DOWNLOAD_ID, -1);
            if (myDownloadReference == reference) 

                     ...
                switch (status) 
                    case DownloadManager.STATUS_SUCCESSFUL:

                        Intent mServiceIntent = new Intent(context, UnZipService.class);
                        mServiceIntent.setData(Uri.parse(savedFilePath));
                        startActivity(mServiceIntent);

                        break;
                    ...
                
                cursor.close();
            
        
    ;
    registerReceiver(receiverDownloadComplete, intentFilter);

这里的服务：

public class UnZipService extends IntentService 
public UnZipService() 
    super("UnZipService");


@Override
protected void onHandleIntent(Intent workIntent) 
    String dataString = workIntent.getDataString();
    Log.v("IntentURI", dataString);
    Toast.makeText(this, "Installing....", Toast.LENGTH_SHORT).show();

它应该显示 toast 只是为了测试，但我总是得到一个错误：

    01-29 19:08:25.740  15521-15521/org.osmdroid E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Error receiving broadcast Intent  act=android.intent.action.DOWNLOAD_COMPLETE flg=0x10 pkg=org.osmdroid (has extras)  in org.osmdroid.SettingsActivity$1@21292650
            at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:768)
            at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5147)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class org.osmdroid/org.osmdroid.UnZipService; have you declared this activity in your AndroidManifest.xml?
            at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1618)
            at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
            at android.app.Activity.startActivityForResult(Activity.java:3404)
            at android.app.Activity.startActivityForResult(Activity.java:3365)
            at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:817)
            at android.app.Activity.startActivity(Activity.java:3600)
            at android.app.Activity.startActivity(Activity.java:3568)
            at org.osmdroid.SettingsActivity$1.onReceive(SettingsActivity.java:148)
            at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:758)
at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:150)
            at android.app.ActivityThread.main(ActivityThread.java:5147)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)    

（类和活动）都在同一个文件夹（org.osmdroid）中。似乎路径还可以，但问题出现了，我没有更多的想法......

【问题讨论】：

您是否按照错误提示进行操作并将其添加到您的清单中？

UnZipService 是一项服务而不是一项活动。将其作为服务启动。请看我的回答

【参考方案1】：

您正在将服务作为一项活动启动

改变

Intent mServiceIntent = new Intent(context, UnZipService.class);
mServiceIntent.setData(Uri.parse(savedFilePath));
startActivity(mServiceIntent);

到

Intent mServiceIntent = new Intent(context, UnZipService.class);
mServiceIntent.setData(Uri.parse(savedFilePath));
startService(mServiceIntent); // Only this line is changed

【讨论】：

上帝...花这么多时间因为这个错字！非常感谢！

【参考方案2】：

请在您的 AndroidManifest.xml 中声明此活动