Android (Java) Learning Note 123:clock App write error

1. First of all we apart directly read the wrong content as follows:

07-12 08:25:03.572:E/DALVIKVM (3602):nativeFork pid:0Done .07-12 08:25:03.582:E/DALVIKVM (3602): threadid=6:created from Interp,name=Referencequeuedaemon07-12 08:25:03.582:E/DALVIKVM (3602): threadid=6:calling run (), name=Referencequeuedaemon07-12 08:25:03.582:E/DALVIKVM (3602): threadid=7:created from Interp,name=Finalizerdaemon07-12 08:25:03.582:E/DALVIKVM (3602): threadid=7:calling run (), name=Finalizerdaemon07-12 08:25:03.592:E/DALVIKVM (3602): threadid=8:created from Interp,name=Finalizerwatchdogdaemon07-12 08:25:03.592:E/DALVIKVM (3602): threadid=8:calling run (), name=Finalizerwatchdogdaemon07-12 08:25:03.642:d/activitythread (3602): settargetheaputilization:0.2507-12 08:25:03.642:d/activitythread (3602) : settargetheapidealfree:838860807-12 08:25:03.642:d/activitythread (3602): Settargetheapconcurrentstart : 209715207-12 08:25:03.662:i/system.out (3602): Sending WAIT Chunk07-12 08:25:03.662:w/activitythread (3602): Application Com.himi.clock is waiting forThe debugger on port 8100...07-12 08:25:05.253:i/system.out (3602): Debugger has connected07-12 08:25:05.253:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:05.454:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:05.654:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:05.854:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:06.054:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:06.254:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:06.455:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:06.655:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:06.855:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:07.055:i/system.out (3602): Waiting fordebugger to settle ...07-12 08:25:07.256:i/system.out (3602): Debugger has settled (1411)07-12 08:26:55.171:d/activitythread (4159): settargetheaputilization:0.2507-12 08:26:55.171:d/activitythread (4159) : settargetheapidealfree:838860807-12 08:26:55.171:d/activitythread (4159): Settargetheapconcurrentstart : 209715207-12 08:26:55.391:W/DALVIKVM (4159): Threadid=1:thread exiting with uncaught exception (group=0x416cd498)07-12 08:26:55.391:e/androidruntime (4159): FATAL exception:main07-12 08:26:55.391:e/androidruntime (4159): java.lang.RuntimeException:Unable to start activity componentinfo{ Com.himi.clock/com.himi.clock.mainactivity}: Android.content.ActivityNotFoundException:Unable to find explicit Activityclass{com.himi.clock/com.himi.clock.clockactivity}; Have your declared ThisActivity in your androidmanifest.xml?07-12 08:26:55.391:e/androidruntime (4159): at Android.app.ActivityThread.perfor Mlaunchactivity (activitythread.java:2092)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.ActivityThread.handleLaunchActivity (Activitythread.java : 2117)07-12 08:26:55.391:e/androidruntime (4159): at android.app.activitythread.access$600 (ActivityThread.java:140)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.activitythread$h.handlemessage (ActivityThread.java:1213)07-12 08:26:55.391:e/androidruntime (4159): at Android.os.Handler.dispatchMessage (handler.java:99)07-12 08:26:55.391:e/androidruntime (4159): at Android.os.Looper.loop (looper.java:137)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.ActivityThread.main (activitythread.java:4914)07-12 08:26:55.391:e/androidruntime (4159): At Java.lang.reflect.Method.invokeNative (Native Method)07-12 08:26:55.391:e/androidruntime (4159): at Java.lang.reflect.Method.invoke (method.java:511)07-12 08:26:55.391:e/androidruntime (4159): at Com.android.internal.os.zygoteinit$methodandargscaller.run ( zygoteinit.java:808)07-12 08:26:55.391:e/androidruntime (4159): at Com.android.internal.os.ZygoteInit.main (zygoteinit.java:575)07-12 08:26:55.391:e/androidruntime (4159): At Dalvik.system.NativeStart.main (Native Method)07-12 08:26:55.391:e/androidruntime (4159): caused By:android.content.ActivityNotFoundException:Unable to find Explicit activityclass{com.himi.clock/com.himi.clock.clockactivity}; Have your declared ThisActivity in your androidmanifest.xml?07-12 08:26:55.391:e/androidruntime (4159): at Android.app.Instrumentation.check Startactivityresult (instrumentation.java:1541)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.ActivityThread.resolveActivityInfo (Activitythread.java : 1903)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.LocalActivityManager.startActivity ( localactivitymanager.java:285)07-12 08:26:55.391:e/androidruntime (4159): at Android.widget.tabhost$intentcontentstrategy.getcontentview ( tabhost.java:694)07-12 08:26:55.391:e/androidruntime (4159): at Android.widget.TabHost.setCurrentTab (tabhost.java:358)07-12 08:26:55.391:e/androidruntime (4159): at Android.widget.TabHost.addTab (tabhost.java:236)07-12 08:26:55.391:e/androidruntime (4159): at Com.himi.clock.MainActivity.addOneTab (mainactivity.java:32)07-12 08:26:55.391:e/androidruntime (4159): at Com.himi.clock.MainActivity.onCreate (mainactivity.java:20)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.Activity.performCreate (activity.java:5086)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.Instrumentation.callActivityOnCreate ( instrumentation.java:1079)07-12 08:26:55.391:e/androidruntime (4159): At Com.lbe.security.service.core.client.b.x.callactivityoncreate (Unknown Source)07-12 08:26:55.391:e/androidruntime (4159): at Android.app.ActivityThread.performLaunchActivity ( activitythread.java:2056)07-12 08:26:55.391:e/androidruntime (4159): ... 11 More07-12 08:34:04.128:d/activitythread (6074): settargetheaputilization:0.2507-12 08:34:04.128:d/activitythread (6074) : settargetheapidealfree:838860807-12 08:34:04.128:d/activitythread (6074): Settargetheapconcurrentstart : 209715207-12 08:34:04.379:W/DALVIKVM (6074): Threadid=1:thread exiting with uncaught exception (group=0x416cd498)07-12 08:34:04.389:e/androidruntime (6074): FATAL exception:main07-12 08:34:04.389:e/androidruntime (6074):java.lang.RuntimeException:Unable to start activity componentinfo{com.himi.clock/com.himi.clock.mainactivity}: Android.content.ActivityNotFoundException:Unable to find explicit activity class {com.himi.clock/ Com.himi.clock.ClockActivity}; Declared this activity in your androidmanifest.xml?07-12 08:34:04.389:e/androidruntime (6074): at Android.app.ActivityThread.performLaunchActivity ( activitythread.java:2092)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.ActivityThread.handleLaunchActivity (Activitythread.java : 2117)07-12 08:34:04.389:e/androidruntime (6074): at android.app.activitythread.access$600 (ActivityThread.java:140)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.activitythread$h.handlemessage (ActivityThread.java:1213)07-12 08:34:04.389:e/androidruntime (6074): at Android.os.Handler.dispatchMessage (handler.java:99)07-12 08:34:04.389:e/androidruntime (6074): at Android.os.Looper.loop (looper.java:137)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.ActivityThread.main (activitythread.java:4914)07-12 08:34:04.389:e/androidruntime (6074): At Java.lang.reflect.Method.invokeNative (Native Method)07-12 08:34:04.389:e/androidruntime (6074): at Java.lang.reflect.Method.invoke (method.java:511)07-12 08:34:04.389:e/androidruntime (6074): at Com.android.internal.os.zygoteinit$methodandargscaller.run ( zygoteinit.java:808)07-12 08:34:04.389:e/androidruntime (6074): at Com.android.internal.os.ZygoteInit.main (zygoteinit.java:575)07-12 08:34:04.389:e/androidruntime (6074): At Dalvik.system.NativeStart.main (Native Method)07-12 08:34:04.389:e/androidruntime (6074):caused By:android.content.ActivityNotFoundException:Unable to find explicit activity class {com.himi.clock/ Com.himi.clock.ClockActivity}; Declared this activity in your androidmanifest.xml?07-12 08:34:04.389:e/androidruntime (6074): at Android.app.Instrumentation.checkStartActivityResult ( instrumentation.java:1541)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.ActivityThread.resolveActivityInfo (Activitythread.java : 1903)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.LocalActivityManager.startActivity ( localactivitymanager.java:285)07-12 08:34:04.389:e/androidruntime (6074): at Android.widget.tabhost$intentcontentstrategy.getcontentview ( tabhost.java:694)07-12 08:34:04.389:e/androidruntime (6074): at Android.widget.TabHost.setCurrentTab (tabhost.java:358)07-12 08:34:04.389:e/androidruntime (6074): at Android.widget.TabHost.addTab (tabhost.java:236)07-12 08:34:04.389:e/androidruntime (6074): at Com.himi.clock.MainActivity.addOneTab (mainactivity.java:32)07-12 08:34:04.389:e/androidruntime (6074): at Com.himi.clock.MainActivity.onCreate (mainactivity.java:20)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.Activity.performCreate (activity.java:5086)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.Instrumentation.callActivityOnCreate ( instrumentation.java:1079)07-12 08:34:04.389:e/androidruntime (6074): At Com.lbe.security.service.core.client.b.x.callactivityoncreate (Unknown Source)07-12 08:34:04.389:e/androidruntime (6074): at Android.app.ActivityThread.performLaunchActivity ( activitythread.java:2056)07-12 08:34:04.389:e/androidruntime (6074): ... One more

Read the error message in the red font carefully to know: Originally I wrote the app contains a number of activity, must be declared in the Androidmanifest.xml, declared as follows:

<?xml version= "1.0" encoding= "Utf-8"? ><manifest xmlns:android= "Http://schemas.android.com/apk/res/android" Package= "Com.himi.clock"Android:versioncode= "1"Android:versionname= "1.0" > <uses-SDK Android:minsdkversion= "15"android:targetsdkversion= "/>" <Application Android:allowbackup= "true"Android:icon= "@drawable/ic_launcher"Android:label= "@string/app_name"Android:theme= "@style/apptheme" > <Activity Android:name=". Mainactivity "Android:label= "@string/app_name" > <intent-filter> <action android:name= "Android.intent.action.MA In "/> <category android:name=" Android.intent.category.LAUNCHER "/> </intent-filter&        Gt </activity><activity android:name= ". Clockactivity "/> <activity android:name=". Stopwatchactivity "/> <activity android:name=". Timeractivity "/></application></manifest>

Loading the program into the phone again, found that this time can be run, no error

So why do you register multiple activity in Androidmanifest.xml declaration???

A: We know that different activity represents a different window interface, the Android system only has to register the different activity, the internal system can operate on it, such as using intent operation.

Android (Java) Learning Note 123:clock App write error