如何从一个片段开始一个活动？

-1

我有3个片段和Frangment3上的按钮。当我按下该按钮时，我想开始一个名为Baigimas的活动，但它不起作用。当我在模拟器中按下按钮时，我的程序关闭。如何从一个片段开始一个活动？

Fragment3.java

public class Fragment3 extends Fragment{ 

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View v = inflater.inflate(R.layout.fragment3_layout, container, false); 


    View.OnClickListener listnr=new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent intent = new Intent(getActivity(), Baigimas.class); 
      startActivity(intent); 
     } 
    }; 

    Button btn =(Button) v.findViewById(R.id.button); 
    btn.setOnClickListener(listnr); 

    return v; 
}}

下面是我在logcat中看到：

03-31 05:51:45.166 1937-1937/bandymas.viewpagerexample I/art﹕ Not late-enabling -Xcheck:jni (already on) 
03-31 05:51:45.518 1937-1962/bandymas.viewpagerexample D/OpenGLRenderer﹕ Render dirty regions requested: true 
03-31 05:51:45.521 1937-1937/bandymas.viewpagerexample D/﹕ HostConnection::get() New Host Connection established 0xae0cfdb0, tid 1937 
03-31 05:51:45.554 1937-1937/bandymas.viewpagerexample D/Atlas﹕ Validating map... 
03-31 05:51:47.776 1937-1950/bandymas.viewpagerexample I/art﹕ Background sticky concurrent mark sweep GC freed 2039(140KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 1891KB/1891KB, paused 131.931ms total 163.748ms 
03-31 05:51:47.898 1937-1962/bandymas.viewpagerexample D/﹕ HostConnection::get() New Host Connection established 0xae0cff40, tid 1962 
03-31 05:51:47.912 1937-1962/bandymas.viewpagerexample I/OpenGLRenderer﹕ Initialized EGL, version 1.4 
03-31 05:51:47.924 1937-1962/bandymas.viewpagerexample D/OpenGLRenderer﹕ Enabling debug mode 0 
03-31 05:51:47.945 1937-1962/bandymas.viewpagerexample W/EGL_emulation﹕ eglSurfaceAttrib not implemented 
03-31 05:51:47.946 1937-1962/bandymas.viewpagerexample W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xae0e7860, error=EGL_SUCCESS 
03-31 05:51:47.988 1937-1950/bandymas.viewpagerexample I/art﹕ Background partial concurrent mark sweep GC freed 326(35KB) AllocSpace objects, 0(0B) LOS objects, 39% free, 1866KB/3MB, paused 1.087ms total 144.656ms 
03-31 05:51:48.750 1937-1962/bandymas.viewpagerexample W/EGL_emulation﹕ eglSurfaceAttrib not implemented 
03-31 05:51:48.750 1937-1962/bandymas.viewpagerexample W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xae0e7860, error=EGL_SUCCESS 
03-31 05:51:57.303 1937-1937/bandymas.viewpagerexample D/AndroidRuntime﹕ Shutting down VM 
    --------- beginning of crash 
03-31 05:51:57.305 1937-1937/bandymas.viewpagerexample E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: bandymas.viewpagerexample, PID: 1937 
    android.content.ActivityNotFoundException: Unable to find explicit activity class {bandymas.viewpagerexample/bandymas.viewpagerexample.Baigimas}; have you declared this activity in your AndroidManifest.xml? 
      at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1761) 
      at android.app.Instrumentation.execStartActivity(Instrumentation.java:1485) 
      at android.app.Activity.startActivityForResult(Activity.java:3736) 
      at android.app.Activity.startActivityForResult(Activity.java:3697) 
      at android.support.v4.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:826) 
      at android.support.v4.app.Fragment.startActivity(Fragment.java:896) 
      at bandymas.viewpagerexample.Fragment3$1.onClick(Fragment3.java:25) 
      at android.view.View.performClick(View.java:4756) 
      at android.view.View$PerformClick.run(View.java:19749) 
      at android.os.Handler.handleCallback(Handler.java:739) 
      at android.os.Handler.dispatchMessage(Handler.java:95) 
      at android.os.Looper.loop(Looper.java:135) 
      at android.app.ActivityThread.main(ActivityThread.java:5221) 
      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:899) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

AndroidManifest.xml中

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

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/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.MAIN" /> 

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

</manifest>

来源

2015-03-30 Kaspis245

会发生什么？它对我来说看起来不错 – Blackbelt 2015-03-30 19:20:18

除非活动没有在清单中定义...但是它会抛出很好且明显的异常... – Selvin 2015-03-30 19:26:17

“不起作用”不是问题陈述。如果您需要帮助，您需要添加更多有关正在发生的事情的详细信息。 – tnw 2015-03-30 19:35:42

更新您的清单如下并尝试，

<activity 
     android:name="<full package name>.Baigimas" 
     android:screenOrientation="portrait" > 
    </activity>

来源

2015-03-31 06:27:52

我的软件包名称是bandymas.viewpagerexample，但是当我使用它时，出现此错误：_bandymas.viewpagerexample.Baigimas'不能分配给'android.app.Activity'_ – Kaspis245 2015-03-31 06:42:03

您的Baigimas如何扩展？ – Piyush 2015-03-31 06:44:24

您需要从Activity或其后代扩展您的Baigimas。 – SilentKnight 2015-03-31 06:51:22

在您的清单中添加您的活动。

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

来源

2015-03-31 06:32:33

深吸一下进入logcat的：

android.content.ActivityNotFoundException: Unable to find explicit activity class {bandymas.viewpagerexample/bandymas.viewpagerexample.Baigimas}; have you declared this activity in your AndroidManifest.xml?

它已经明显告诉你：你可能不部署Baigima.java活动。因此，通过加入这一行完成AndroidManifest.xml：

<activity 
    android:name="<your-activity-baigimas-path>.Baigimas" 
    ...... 
> 
</activity>

来源

2015-03-31 06:40:54 SilentKnight

如何从一个片段开始一个活动？

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