android.content.ActivityNotFoundException: Unable to find explicit activity class(安卓报错)

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#导入第三方源码常见错误

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本文记录了在Android开发过程中遇到的一个常见问题：ActivityNotFoundException。该异常提示未在AndroidManifest.xml中声明某个Activity。通过检查并正确声明Activity，解决了应用程序启动时报错的问题。

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今天我在给项目加入仿微信滑动界面时，写好代码后运行出现一个小错误，具体报错情况如下：

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.example.biblebooks, PID: 5676
                  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.biblebooks/com.example.biblebooks.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.biblebooks/com.example.biblebooks.OneSubjectActivity}; have you declared this activity in your AndroidManifest.xml?
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2651)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2715)
                      at android.app.ActivityThread.access$800(ActivityThread.java:178)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1579)
                      at android.os.Handler.dispatchMessage(Handler.java:111)
                      at android.os.Looper.loop(Looper.java:199)
                      at android.app.ActivityThread.main(ActivityThread.java:5783)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at java.lang.reflect.Method.invoke(Method.java:372)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:777)
                   Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.biblebooks/com.example.biblebooks.OneSubjectActivity}; have you declared this activity in your AndroidManifest.xml?
                      at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1830)
                      at android.app.ActivityThread.resolveActivityInfo(ActivityThread.java:2445)
                      at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:286)
                      at com.example.biblebooks.MainActivity.getView(MainActivity.java:122)
                      at com.example.biblebooks.MainActivity.onCreate(MainActivity.java:50)
                      at android.app.Activity.performCreate(Activity.java:6070)
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1125)
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2604)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2715) 
                      at android.app.ActivityThread.access$800(ActivityThread.java:178) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1579) 
                      at android.os.Handler.dispatchMessage(Handler.java:111) 
                      at android.os.Looper.loop(Looper.java:199) 
                      at android.app.ActivityThread.main(ActivityThread.java:5783) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:372) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:777)

关键的错误点在这里：

android.content.ActivityNotFoundException: Unable to find explicit activity

错误的引导却是：

at com.example.biblebooks.MainActivity.getView(MainActivity.java:122)
private View getView(String id, Intent intent) {
        return manager.startActivity(id, intent).getDecorView();
    }

                      at com.example.biblebooks.MainActivity.onCreate(MainActivity.java:50)

 views.add(getView("QualityActivity"+i+1, intent));

顺着这个报错的具体代码我反复检查发现代码并没有错误，最后检查了清单文件发现少配置了一个东西

最后加上这行代码运行顺利解决。

<activity android:name=".OneSubjectActivity"/>