在Android中使用Intent啟動新活動時出錯

Question

我已經為我的Android應用程序創建了一個菜單。 菜單上有幾個按鈕，第一個按鈕應該使用Intent啟動名為“ BackgroundImages”的新活動。 但是，當我在模擬器上安裝該應用程序並單擊該按鈕時，會收到以下錯誤“ Unfortunatlry，NewtonLow已停止”。此外，“ NewtonLow”是該應用程序的名稱。 以下內容演示了我為啟動新活動所執行的步驟。

1. 我創建了一個名為Menu的類，該類顯示menu.xml布局，如下所示：

    public class Menu extends Activity{ MediaPlayer mp1; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.menu); mp1= MediaPlayer.create(this,R.raw.button ); Button but1 = (Button)findViewById(R.id.button1); but1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub mp1.start(); startActivity(new Intent("ghassar.mohamed.newtonlaw.BACKGROUNDIMAGES")); } }); }} 

2. 我已編輯Manifast以首先啟動菜單類，如下所示：

     <activity android:name=".Menu" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> 

   3. 我還為backgroundImage類添加了活動以使用它，這樣我就可以開始活動了：

        <activity android:name=".BackgroundImages"android:label="@string/app_name" > <intent-filter> <action android:name="ghassar.mohamed.newtonlaw.BACKGROUNDIMAGES" /> <category android:name="android.intent.category.DEFUALT" /> </intent-filter> 

Logcat錯誤：

05-16 12:17:52.242: I/GenericSource(64): start
05-16 12:17:52.274: W/IntentResolver(347): resolveIntent failed: found match, but none with CATEGORY_DEFAULT
05-16 12:17:52.274: I/ActivityManager(347): START u0 {act=ghassar.mohamed.newtonlaw.BACKGROUNDIMAGES} from uid 10053 on display 0
05-16 12:17:52.276: D/AndroidRuntime(2247): Shutting down VM
05-16 12:17:52.315: E/AndroidRuntime(2247): FATAL EXCEPTION: main
05-16 12:17:52.315: E/AndroidRuntime(2247): Process: ghassar.mohamed.newtonlaw, PID: 2247
05-16 12:17:52.315: E/AndroidRuntime(2247): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=ghassar.mohamed.newtonlaw.BACKGROUNDIMAGES }
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1781)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1501)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.app.Activity.startActivityForResult(Activity.java:3745)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.app.Activity.startActivityForResult(Activity.java:3706)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.app.Activity.startActivity(Activity.java:4016)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.app.Activity.startActivity(Activity.java:3984)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at ghassar.mohamed.newtonlaw.Menu$1.onClick(Menu.java:28)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.view.View.performClick(View.java:4780)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.view.View$PerformClick.run(View.java:19866)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.os.Handler.handleCallback(Handler.java:739)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.os.Handler.dispatchMessage(Handler.java:95)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.os.Looper.loop(Looper.java:135)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at android.app.ActivityThread.main(ActivityThread.java:5257)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at java.lang.reflect.Method.invoke(Native Method)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at java.lang.reflect.Method.invoke(Method.java:372)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
05-16 12:17:52.315: E/AndroidRuntime(2247):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
05-16 12:17:52.324: W/ActivityManager(347):   Force finishing activity 1 ghassar.mohamed.newtonlaw/.Menu
05-16 12:17:52.347: D/AudioSink(64): bufferCount (8) is too small and increased to 12
05-16 12:17:52.495: E/EGL_emulation(53): tid 53: eglCreateSyncKHR(1237): error 0x3004 (EGL_BAD_ATTRIBUTE)
05-16 12:17:52.781: I/OpenGLRenderer(347): Initialized EGL, version 1.4
05-16 12:17:52.827: W/EGL_emulation(347): eglSurfaceAttrib not implemented
05-16 12:17:52.827: W/OpenGLRenderer(347): Failed to set EGL_SWAP_BEHAVIOR on surface 0x9f334060, error=EGL_SUCCESS
05-16 12:17:53.375: W/ActivityManager(347): Activity pause timeout for ActivityRecord{13745810 u0 ghassar.mohamed.newtonlaw/.Menu t30 f}
05-16 12:17:54.507: W/ResourceType(791): No package identifier when getting value for resource number 0x00000000
05-16 12:17:54.508: W/PackageManager(791): Failure retrieving resources for ghassar.mohamed.newtonlaw: Resource ID #0x0
05-16 12:17:54.590: I/OpenGLRenderer(618): Initialized EGL, version 1.4
05-16 12:17:54.736: W/EGL_emulation(618): eglSurfaceAttrib not implemented
05-16 12:17:54.736: W/OpenGLRenderer(618): Failed to set EGL_SWAP_BEHAVIOR on surface 0xa5029520, error=EGL_SUCCESS
05-16 12:17:55.144: I/art(618): Background partial concurrent mark sweep GC freed 2481(214KB) AllocSpace objects, 20(6MB) LOS objects, 24% free, 12MB/16MB, paused 1.176ms total 132.034ms
05-16 12:17:55.553: I/Choreographer(347): Skipped 50 frames!  The application may be doing too much work on its main thread.
05-16 12:17:57.358: I/Choreographer(347): Skipped 51 frames!  The application may be doing too much work on its main thread.
05-16 12:17:57.369: I/Choreographer(347): Skipped 50 frames!  The application may be doing too much work on its main thread.
05-16 12:17:57.585: I/Process(2247): Sending signal. PID: 2247 SIG: 9
05-16 12:17:57.607: D/NuPlayerDriver(64): reset(0xb5915280)
05-16 12:17:57.619: W/InputDispatcher(347): channel '17ecf26e ghassar.mohamed.newtonlaw/ghassar.mohamed.newtonlaw.Menu (server)' ~ Consumer closed input channel or an error occurred.  events=0x9
05-16 12:17:57.619: E/InputDispatcher(347): channel '17ecf26e ghassar.mohamed.newtonlaw/ghassar.mohamed.newtonlaw.Menu (server)' ~ Channel is unrecoverably broken and will be disposed!
05-16 12:17:57.632: I/ActivityManager(347): Process ghassar.mohamed.newtonlaw (pid 2247) has died
05-16 12:17:57.645: D/NuPlayerDriver(64): notifyResetComplete(0xb5915280)
05-16 12:17:57.673: W/AudioTrack(347): AUDIO_OUTPUT_FLAG_FAST denied by client
05-16 12:17:57.890: I/WindowState(347): WIN DEATH: Window{17ecf26e u0 ghassar.mohamed.newtonlaw/ghassar.mohamed.newtonlaw.Menu}
05-16 12:17:57.890: W/InputDispatcher(347): Attempted to unregister already unregistered input channel '17ecf26e ghassar.mohamed.newtonlaw/ghassar.mohamed.newtonlaw.Menu (server)'
05-16 12:17:58.151: W/InputMethodManagerService(347): Got RemoteException sending setActive(false) notification to pid 2247 uid 10053
05-16 12:17:58.200: W/OpenGLRenderer(618): Incorrectly called buildLayer on View: ShortcutAndWidgetContainer, destroying layer...

Answer 1

在您的清單中，我可以看到一個拼寫錯誤（用DEFUALT而不是DEFAULT）

<intent-filter>
    <action android:name="ghassar.mohamed.newtonlaw.BACKGROUNDIMAGES" />
    <category android:name="android.intent.category.DEFAULT" />
</intent-filter>