Question

我的XML中有一个视图引用了一个方法，而该方法又应该打开AnnouncementsScreen.java类，但它会抛出以下logcat消息。它似乎声明它找不到AnnouncementsScreen.java文件，尽管它已在清单中声明，并且我已经检查了拼写。

11-09 23:05:22.040 28199-28199/? E/Zygote: MountEmulatedStorage()
11-09 23:05:22.040 28199-28199/? E/Zygote: v2
11-09 23:05:22.060 28199-28199/? E/SELinux: [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime: FATAL EXCEPTION: main
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime: Process: com.t99sdevelopment.centralized, PID: 28199
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.SupportMenuInflater$InflatedOnMenuItemClickListener.onMenuItemClick(SupportMenuInflater.java:259)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:300)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.view.View.performClick(View.java:5156)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.view.View$PerformClick.run(View.java:20755)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:739)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:145)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5835)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:  Caused by: java.lang.reflect.InvocationTargetException
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.SupportMenuInflater$InflatedOnMenuItemClickListener.onMenuItemClick(SupportMenuInflater.java:255)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:300) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.view.View.performClick(View.java:5156) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.view.View$PerformClick.run(View.java:20755) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:739) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:145) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5835) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:  Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {/com.t99sdevelopment.centralized.AnnouncementsScreen}; have you declared this activity in your AndroidManifest.xml?
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1777)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1499)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.Activity.startActivityForResult(Activity.java:3913)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.Activity.startActivityForResult(Activity.java:3860)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:784)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.Activity.startActivity(Activity.java:4184)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.Activity.startActivity(Activity.java:4152)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at com.t99sdevelopment.centralized.HomeScreen.goToAnnouncements(HomeScreen.java:37)
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.SupportMenuInflater$InflatedOnMenuItemClickListener.onMenuItemClick(SupportMenuInflater.java:255) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:300) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.view.View.performClick(View.java:5156) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.view.View$PerformClick.run(View.java:20755) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:739) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:145) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5835) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) 
11-09 23:05:26.090 28199-28199/com.t99sdevelopment.centralized E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

如果有人想要检查我的文件，整个GitHub项目都是here。我无法找到对我有意义的其他例外情况，所以我从这里开始，但如果有人理解其他错误并且可以解释它们，那就太棒了。

这是我的AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.t99sdevelopment.centralized" >

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

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".AnnouncementsScreen"
            android:label="@string/title_activity_announcements_screen"
            android:parentActivityName=".HomeScreen"
            android:theme="@style/AppTheme"
             >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.t99sdevelopment.centralized.HomeScreen" />
        </activity>
        <activity android:name=".ScheduleScreen" >
        </activity>
        <activity android:name=".CalendarScreen" >
        </activity>
        <activity android:name=".ContactBookScreen" >
        </activity>
        <activity android:name=".SportsScheduleScreen" >
        </activity>
        <activity android:name=".FrontAndCentralScreen" >
        </activity>
        <activity android:name=".MapScreen" >
        </activity>
        <activity android:name=".AccountScreen" >
        </activity>
    </application>

</manifest>

发生错误的活动：

public class HomeScreen extends AppCompatActivity {

    Intent intentAnnouncements = new Intent(this, AnnouncementsScreen.class);


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_homescreen);
        setTheme(R.style.AppTheme);
    }


    public void goToAnnouncements(MenuItem item){ startActivity(intentAnnouncements); }

}

修改

@ njzk2指出了这个错误。在完全初始化类之前，我无法使用 this 关键字。我将意图的声明移动到它各自的方法中，现在它的工作正常。这个问题与我的Android清单无关，而是由* this（关键字。

对HomeScreen.class的引用。

Answer 1

你犯了一个小错误，

<activity
            android:name=".AnnouncementsScreen"
            android:label="@string/title_activity_announcements_screen"
            android:parentActivityName=".HomeScreen"
            android:theme="@style/AppTheme" >

在您的清单文件中，您已声明上述名为 .AnnouncementsScreen 的类，而您正在询问您的问题，

似乎说它无法找到 AnnouncementScreen.java 文件。

因此，两个类都不同，所以只需将您的活动名称从 .AnnouncementsScreen 替换为 .AnnouncementScreen ，它就适合您。

Answer 2

这是因为java.lang.reflect.InvocationTargetException首先验证清单文件中的目标类。

<activity android:name=".Target" android:label="@string/title_activity_target" > </activity>

希望它能起作用..

Answer 3

编辑2

我已下载此代码并运行

只需更改功能goToAnnouncements：

public void goToAnnouncements(MenuItem item){
    Intent intent = new Intent(this, AnnouncementsScreen.class);

    startActivity(intent); 
}

请更新您的代码

修改

您能否添加有关此类出现错误的代码？

Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {/com.t99sdevelopment.centralized.AnnouncementsScreen}; have you declared this activity in your AndroidManifest.xml?

检查错误日志！请在运行app
之前将声明的所有活动添加到AndroidManifest.xml
<activity android:name="com.t99sdevelopment.centralized.AnnouncementsScreen"/>

调用使用Intent的方法会崩溃应用程序

3 个答案: