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  • Java 我正在使用带有片段的RecyclerView，但在我的应用程序中单击底部导航的视频图标时，我的列表没有显示。应用程序未显示任何错误

Java 我正在使用带有片段的RecyclerView，但在我的应用程序中单击底部导航的视频图标时，我的列表没有显示。应用程序未显示任何错误

java android android-layout listview android-fragments

Java 我正在使用带有片段的RecyclerView，但在我的应用程序中单击底部导航的视频图标时，我的列表没有显示。应用程序未显示任何错误,java,android,android-layout,listview,android-fragments,Java,Android,Android Layout,Listview,Android Fragments,这是我的视频片段。我只想在点击底部导航栏的视频菜单后显示列表视图。但是列表视图没有显示。我是android studio的新手。请帮助我。这是我的视频片段代码 VideoFragment.java public class VideoFragment extends Fragment { ArrayList<String> chapterNames=new ArrayList<>(); @Nullable @Override public View onCreat

这是我的视频片段。我只想在点击底部导航栏的视频菜单后显示列表视图。但是列表视图没有显示。我是android studio的新手。请帮助我。这是我的视频片段代码

VideoFragment.java

public class VideoFragment extends Fragment {

ArrayList<String> chapterNames=new ArrayList<>();



@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view=inflater.inflate(R.layout.fragment_videos,container,false);

    chapterNames.add("chapter 1");
    chapterNames.add("chapter 2");
    chapterNames.add("chapter 3");
    chapterNames.add("chapter 4");


    ListView listChapters=view.findViewById(R.id.listView);
    ArrayAdapter<String> listViewAdapter=new ArrayAdapter<String>(this.getContext(),android.R.layout.simple_list_item_1,chapterNames);
    listChapters.setAdapter(listViewAdapter);
    return view;
}}
完整日志目录

     09/18 00:05:16: Launching 'app' on Realme RMX1825.
 $ adb shell am start -n 
 "com.example.dronschool/com.example.dronschool.MainActivity" -a 
android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
 Waiting for application to come online: com.example.dronschool.test | 
com.example.dronschool
Connecting to com.example.dronschool
 Waiting for application to start debug server
 Waiting for application to come online: com.example.dronschool.test | 
  com.example.dronschool
  Connecting to com.example.dronschool
  Capturing and displaying logcat messages from application. This behavior 
  can be disabled in the "Logcat output" section of the "Debugger" settings 
 page.
  I/System.out: Debugger has connected
  waiting for debugger to settle...
 Connected to the target VM, address: 'localhost:8602', transport: 'socket'
 I/chatty: uid=10207(com.example.dronschool) identical 2 lines
  I/System.out: waiting for debugger to settle...
  I/System.out: waiting for debugger to settle...
 I/chatty: uid=10207(com.example.dronschool) identical 2 lines
  I/System.out: waiting for debugger to settle...
  I/System.out: debugger has settled (1332)
 W/mple.dronschool: type=1400 audit(0.0:143126): avc: denied { search } for 
  name="/" dev="mmcblk0p38" ino=2 
  scontext=u:r:untrusted_app:s0:c207,c256,c512,c768 
  tcontext=u:object_r:unlabeled:s0 tclass=dir permissive=0
  D/Bard_Injector: isFlipFontUsed = false
  E/ANR_LOG: >>> msg's executing time is too long
  Blocked msg = { when=-2s950ms what=110 target=android.app.ActivityThread$H 
 obj=AppBindData{appInfo=ApplicationInfo{a4e59e2 com.example.dronschool}} } 
 , cost  = 2930 ms
   >>>Current msg List is:
   E/ANR_LOG: Current msg <1>  = { when=-2s946ms what=159 
   target=android.app.ActivityThread$H obj=ClientTransaction hashCode, 
  mActivityToken = android.os.BinderProxy@98b5173 }
 E/ANR_LOG: Current msg <2>  = { when=-2s945ms what=159 
 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, 
      mActivityToken = android.os.BinderProxy@98b5173 }
   E/ANR_LOG: Current msg <3>  = { when=-2s945ms what=0 
  target=android.app.ActivityThread$H 
     callback=com.android.internal.util.function.pooled.PooledLambdaImpl }
       E/ANR_LOG: Current msg <4>  = { when=-2s944ms what=0 
    target=android.app.ActivityThread$H 
    callback=com.android.internal.util.function.pooled.PooledLambdaImpl }
    E/ANR_LOG: Current msg <5>  = { when=-2s944ms what=149 
   target=android.app.ActivityThread$H obj=android.os.BinderProxy@98b5173 }
   E/ANR_LOG: Current msg <6>  = { when=-2s452ms what=159 
     target=android.app.ActivityThread$H obj=ClientTransaction hashCode, 
      mActivityToken = android.os.BinderProxy@98b5173 }
     E/ANR_LOG: Current msg <7>  = { when=-2s452ms what=137 
      target=android.app.ActivityThread$H arg1=1 
    obj=android.os.BinderProxy@98b5173 }
   >>>CURRENT MSG DUMP OVER<<<
  W/mple.dronschoo: create CommonDcsHelper
    cacheJniMembers success
     constructJavaHashMap: start
      constructJavaHashMap: end
    sendCommonDcs: start
       W/mple.dronschoo: sendCommonDcs: end
      Accessing hidden method Landroid/view/View;- 


 >computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z 
  (light greylist, reflection)
   W/mple.dronschoo: constructJavaHashMap: start
   W/mple.dronschoo: constructJavaHashMap: end
   sendCommonDcs: start
  W/mple.dronschoo: sendCommonDcs: end
     Accessing hidden method Landroid/view/ViewGroup;- 
  >makeOptionalFitsSystemWindows()V (light greylist, reflection)
    D/OpenGLRenderer: Skia GL Pipeline
  I/SurfaceFactory: [static] sSurfaceFactory = 
   com.mediatek.view.impl.SurfaceFactoryImpl@ff05f8e
   I/WindowClient: Add to mViews: DecorView@a79ff45[MainActivity], 
    this=android.view.WindowManagerGlobal@616e69a, 
  pkg=com.example.dronschool
    D/ViewRootImpl[MainActivity]: hardware acceleration = true , 
  fakeHwAccelerated = false, sRendererDisabled = false, forceHwAccelerated = 
   false, sSystemRendererDisabled = false
   W/InputTransport: ARC dlopen LIB: libARC.so fail with dlopen failed: 
     library "libARC.so" not found
     I/InputTransport: Create ARC handle: 0x7ae25316e0
   V/PhoneWindow: DecorView setVisiblity: visibility = 0, Parent = 
   android.view.ViewRootImpl@71f4bcb, this = DecorView@a79ff45[MainActivity]
      I/Choreographer: Skipped 2 frames!  The application may be doing too 
    much work on its main thread.
  D/Surface: Surface::allocateBuffers(this=0x7ad05e3000)
   I/ConfigStore: 

09/18 00:05:16:在Realme RMX1825上启动“应用程序”。
$adb shell am start-n
“com.example.dronschool/com.example.dronschool.main活动”-a
android.intent.action.MAIN-c android.intent.category.LAUNCHER-D
等待在线申请：com.example.dronschool.test |
学校
连接到com.example.school
正在等待应用程序启动调试服务器
等待在线申请：com.example.dronschool.test |
学校
连接到com.example.school
从应用程序捕获和显示logcat消息。这种行为
可在“调试器”设置的“Logcat输出”部分禁用
页
I/System.out:调试器已连接
正在等待调试程序解决。。。
已连接到目标VM，地址：'localhost:8602'，传输：'socket'
I/chatty:uid=10207（com.example.school）相同的两行
I/System.out:正在等待调试器解决。。。
I/System.out:正在等待调试器解决。。。
I/chatty:uid=10207（com.example.school）相同的两行
I/System.out:正在等待调试器解决。。。
I/System.out:调试器已解决（1332）
W/mple.dronschool:type=1400审核（0.0:143126）：avc:拒绝{search}
name=“/”dev=“mmcblk0p38”ino=2
scontext=u:r:untrusted_应用程序：s0:c207、c256、c512、c768
tcontext=u:object\r:unlabel:s0 tclass=dir permissive=0
D/Bard_喷油器：isFlipFontUsed=错误
E/ANR_日志：>>>消息的执行时间太长
阻塞消息={when=-2s950ms what=110 target=android.app.ActivityThread$H
obj=AppBindData{appInfo=ApplicationInfo{a4e59e2 com.example.dronschool}}
，成本=2930毫秒
>>>当前消息列表为：
E/ANR_LOG:Current msg={when=-2s946ms what=159
target=android.app.ActivityThread$H obj=ClientTransaction哈希代码，
mActivityToken=android.os。BinderProxy@98b5173 }
E/ANR_LOG:Current msg={when=-2s945ms what=159
target=android.app.ActivityThread$H obj=ClientTransaction哈希代码，
mActivityToken=android.os。BinderProxy@98b5173 }
E/ANR_LOG:Current msg={when=-2s945ms what=0
target=android.app.ActivityThread$H
callback=com.android.internal.util.function.pooled.PooledLambdaImpl}
E/ANR_LOG:Current msg={when=-2s944ms what=0
target=android.app.ActivityThread$H
callback=com.android.internal.util.function.pooled.PooledLambdaImpl}
E/ANR_LOG:Current msg={when=-2s944ms what=149
target=android.app.ActivityThread$H obj=android.os。BinderProxy@98b5173 }
E/ANR_LOG:Current msg={when=-2s452ms what=159
target=android.app.ActivityThread$H obj=ClientTransaction哈希代码，
mActivityToken=android.os。BinderProxy@98b5173 }
E/ANR_LOG:Current msg={when=-2s452ms what=137
target=android.app.ActivityThread$H arg1=1
obj=android.os。BinderProxy@98b5173 }
>>>当前消息转储OVERmakeOptionalFitsSystemWindows（）V（浅灰色列表，反射）
D/OpenGLRenderer:Skia GL管道
I/SurfaceFactory:[静态]sSurfaceFactory=
com.mediatek.view.impl。SurfaceFactoryImpl@ff05f8e
I/WindowClient:添加到mViews：DecorView@a79ff45[主要活动]，
this=android.view。WindowManagerGlobal@616e69a, 
pkg=com.example.school
D/ViewRootImpl[MainActivity]：硬件加速=真，
fakeHwAccelerated=false，srenderDisabled=false，forceHwAccelerated=
false，ssystemrenderdisabled=false
W/InputTransport:ARC dlopen LIB:libARC.so失败，dlopen失败：
找不到库“libARC.so”
I/InputTransport:创建弧柄：0x7ae25316e0
V/PhoneWindow:DecorView设置可见性：可见性=0，父级=
android.view。ViewRootImpl@71f4bcb，这=DecorView@a79ff45[主要活动]
我/编舞：跳过了2帧！应用程序可能也在运行
在它的主线上做了很多工作。
D/Surface:Surface:：allocateBuffers（this=0x7ad05e3000）
I/ConfigStore：
android:：hardware:：configstore:：V1_0:：ISurfaceFlingerConfigs:：已检索到hasWideColorDisplay:0 检索到的android:：hardware:：configstore:：V1_0:：ISurfaceFlingerConfigs:：hasHDRDisplay:0 I/OpenGLRenderer:初始化EGL，版本1.4 D/OpenGLRenderer:交换行为2 E/OpenGLRenderer:设备声称支持广域，找不到匹配的配置，错误=EGL\u SUCCESS D/Surface:Surface:：connect（this=0x7ad05e3000，api=1） D/mali_winsys:EGLint新窗口曲面（egl_winsys_显示*，无效*，EGLSurface，EGLConfig，egl_winsys_曲面**，EGLBoolean）返回0x3000 我/编舞：跳过了6帧！应用程序可能在其主线程上做了太多工作。 W/RenderThread:type=1400审核（0.0:143128）：avc:denied{search}for name=“/”dev=“mmcblk0p38”ino=2 scontext=u:r:untrusted_app:s0:c207、c256、c512、c768 tcontext=u:object\r:unlabeled:s0 tclass=dir permissive=0 E/ion:ioctl c0044901失败，代码为-1:参数无效 我/编舞：跳过了3帧！应用程序可能做了太多的工作
这需要更多的上下文。XML中的ListView在哪里？另外，您是否正确地实例化了片段？也许可以在OnClickListener中发布您是如何实例化您的片段的。请发布您的完整日志。现在我正确编辑了我的问题。@Jacob我在完整日志上方发布了我的日志 
public class MainActivity extends AppCompatActivity
    implements BottomNavigationView.OnNavigationItemSelectedListener {



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    BottomNavigationView navView = findViewById(R.id.nav_view);

    navView.setOnNavigationItemSelectedListener(this);
    loadFragment(new HomeFragment());
}

private boolean loadFragment(Fragment fragment){
     if(fragment!=null){
      getSupportFragmentManager()
              .beginTransaction()
              .replace(R.id.fragment_layout,fragment)
              .commit();
       return true;
     }
     return false;
}

 @Override
 public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
  Fragment fragment=null;

  switch (menuItem.getItemId()){
      case R.id.navigation_home:
          fragment=new HomeFragment();
          break;

      case R.id.navigation_videos:
          fragment=new VideoFragment();
          break;

      case R.id.navigation_courses:
          fragment=new CoursesFragment();
          break;
      case R.id.navigation_aboutus:
          fragment=new AboutusFragment();
          break;
  }

  return loadFragment(fragment);
  }
 }

     09/18 00:05:16: Launching 'app' on Realme RMX1825.
 $ adb shell am start -n 
 "com.example.dronschool/com.example.dronschool.MainActivity" -a 
android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
 Waiting for application to come online: com.example.dronschool.test | 
com.example.dronschool
Connecting to com.example.dronschool
 Waiting for application to start debug server
 Waiting for application to come online: com.example.dronschool.test | 
  com.example.dronschool
  Connecting to com.example.dronschool
  Capturing and displaying logcat messages from application. This behavior 
  can be disabled in the "Logcat output" section of the "Debugger" settings 
 page.
  I/System.out: Debugger has connected
  waiting for debugger to settle...
 Connected to the target VM, address: 'localhost:8602', transport: 'socket'
 I/chatty: uid=10207(com.example.dronschool) identical 2 lines
  I/System.out: waiting for debugger to settle...
  I/System.out: waiting for debugger to settle...
 I/chatty: uid=10207(com.example.dronschool) identical 2 lines
  I/System.out: waiting for debugger to settle...
  I/System.out: debugger has settled (1332)
 W/mple.dronschool: type=1400 audit(0.0:143126): avc: denied { search } for 
  name="/" dev="mmcblk0p38" ino=2 
  scontext=u:r:untrusted_app:s0:c207,c256,c512,c768 
  tcontext=u:object_r:unlabeled:s0 tclass=dir permissive=0
  D/Bard_Injector: isFlipFontUsed = false
  E/ANR_LOG: >>> msg's executing time is too long
  Blocked msg = { when=-2s950ms what=110 target=android.app.ActivityThread$H 
 obj=AppBindData{appInfo=ApplicationInfo{a4e59e2 com.example.dronschool}} } 
 , cost  = 2930 ms
   >>>Current msg List is:
   E/ANR_LOG: Current msg <1>  = { when=-2s946ms what=159 
   target=android.app.ActivityThread$H obj=ClientTransaction hashCode, 
  mActivityToken = android.os.BinderProxy@98b5173 }
 E/ANR_LOG: Current msg <2>  = { when=-2s945ms what=159 
 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, 
      mActivityToken = android.os.BinderProxy@98b5173 }
   E/ANR_LOG: Current msg <3>  = { when=-2s945ms what=0 
  target=android.app.ActivityThread$H 
     callback=com.android.internal.util.function.pooled.PooledLambdaImpl }
       E/ANR_LOG: Current msg <4>  = { when=-2s944ms what=0 
    target=android.app.ActivityThread$H 
    callback=com.android.internal.util.function.pooled.PooledLambdaImpl }
    E/ANR_LOG: Current msg <5>  = { when=-2s944ms what=149 
   target=android.app.ActivityThread$H obj=android.os.BinderProxy@98b5173 }
   E/ANR_LOG: Current msg <6>  = { when=-2s452ms what=159 
     target=android.app.ActivityThread$H obj=ClientTransaction hashCode, 
      mActivityToken = android.os.BinderProxy@98b5173 }
     E/ANR_LOG: Current msg <7>  = { when=-2s452ms what=137 
      target=android.app.ActivityThread$H arg1=1 
    obj=android.os.BinderProxy@98b5173 }
   >>>CURRENT MSG DUMP OVER<<<
  W/mple.dronschoo: create CommonDcsHelper
    cacheJniMembers success
     constructJavaHashMap: start
      constructJavaHashMap: end
    sendCommonDcs: start
       W/mple.dronschoo: sendCommonDcs: end
      Accessing hidden method Landroid/view/View;- 


 >computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z 
  (light greylist, reflection)
   W/mple.dronschoo: constructJavaHashMap: start
   W/mple.dronschoo: constructJavaHashMap: end
   sendCommonDcs: start
  W/mple.dronschoo: sendCommonDcs: end
     Accessing hidden method Landroid/view/ViewGroup;- 
  >makeOptionalFitsSystemWindows()V (light greylist, reflection)
    D/OpenGLRenderer: Skia GL Pipeline
  I/SurfaceFactory: [static] sSurfaceFactory = 
   com.mediatek.view.impl.SurfaceFactoryImpl@ff05f8e
   I/WindowClient: Add to mViews: DecorView@a79ff45[MainActivity], 
    this=android.view.WindowManagerGlobal@616e69a, 
  pkg=com.example.dronschool
    D/ViewRootImpl[MainActivity]: hardware acceleration = true , 
  fakeHwAccelerated = false, sRendererDisabled = false, forceHwAccelerated = 
   false, sSystemRendererDisabled = false
   W/InputTransport: ARC dlopen LIB: libARC.so fail with dlopen failed: 
     library "libARC.so" not found
     I/InputTransport: Create ARC handle: 0x7ae25316e0
   V/PhoneWindow: DecorView setVisiblity: visibility = 0, Parent = 
   android.view.ViewRootImpl@71f4bcb, this = DecorView@a79ff45[MainActivity]
      I/Choreographer: Skipped 2 frames!  The application may be doing too 
    much work on its main thread.
  D/Surface: Surface::allocateBuffers(this=0x7ad05e3000)
   I/ConfigStore: