慢速创建碎片 Android

huangapple
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英文:

slow creation of fragment android

问题

  1. 所以我有一个片段，它的启动速度非常慢，就像跳过了150多帧。
  2. 我试图在片段内部设置ViewPager，并添加一个onPageChangeListener，在向某个方向滑动后禁用滑动。
  4. 问题在于这真的降低了片段的加载速度。我尝试将其移动到单独的线程和AsyncTask，但仍然很慢。
  6. 片段：
  7. ```java
  9. public class SettingsFragment extends Fragment {
  10.     public View mView;
  12.     public SettingsFragment() {
  13.     }
  15.     @Override
  16.     public void onCreate(Bundle savedInstanceState) {
  17.         super.onCreate(savedInstanceState);
  18.     }
  20.     @Deprecated
  21.     @Override
  22.     public View onCreateView(LayoutInflater inflater, final ViewGroup container,
  23.                              Bundle savedInstanceState) {
  24.         // 填充此片段的布局
  25.         final View rootview = inflater.inflate(R.layout.fragment_settings, container, false);
  26.         this.mView = rootview;
  27.         Task task = new Task();
  28.         task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
  29.         return rootview;
  30.     }
  32.     @Deprecated
  33.     public class Task extends AsyncTask<Void, Void, Void> {
  34.         @Override
  35.         protected Void doInBackground(Void... voids) {
  36.             final CustomViewPager viewPager = mView.findViewById(R.id.ViewPager);
  37.             viewPager.setAdapter(new Adapter(getFragmentManager()));
  38.             viewPager.setCurrentItem(1);
  39.             viewPager.setOffscreenPageLimit(1);
  40.             viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
  41.                 @Override
  42.                 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
  43.                 }
  45.                 @Override
  46.                 public void onPageSelected(int position) {
  47.                     if (position == 0) {
  48.                         viewPager.setPagingEnabled(false);
  49.                     }
  50.                 }
  52.                 @Override
  53.                 public void onPageScrollStateChanged(int state) {
  54.                 }
  55.             });
  56.             return null;
  57.         }
  58.     }
  59. }

片段的xml布局文件：

  1. <!-- 在这里是你的 XML 布局内容 -->

适配器（Adapter.java）：

  1. public class Adapter extends FragmentStatePagerAdapter {
  3.     public Adapter(FragmentManager fragmentManager) {
  4.         super(fragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
  5.     }
  7.     @NonNull
  8.     @NotNull
  9.     @Override
  10.     public Fragment getItem(int position) {
  11.         if (position == 0) {
  12.             return new BlankFragment();
  13.         }
  14.         if (position == 1) {
  15.             return new SettingsFragment();
  16.         }
  17.         return null;
  18.     }
  20.     @Override
  21.     public int getCount() {
  22.         return 2;
  23.     }
  24. }

这些是关于你的代码的翻译。如果你有其他问题，请随时提问。

英文:

So I have a fragment which launches really slowly like it skips 150+ frames.
I am trying to setup ViewPager inside of the fragment and add onPageChangeListener which disables swipe after swiping to a certain direction.

The problem is that it really slows down the fragment loading speed. I tried moving it to a separate thread and AsyncTask but its still slow.

Fragment:

  2. public class SettingsFragment extends Fragment {
  3.     public View mView;
  6.     public SettingsFragment() {
  7.        
  8.     }
  11.     @Override
  12.     public void onCreate(Bundle savedInstanceState) {
  13.         super.onCreate(savedInstanceState);
  15.     }
  16.     @Deprecated
  17.     @Override
  18.     public View onCreateView(LayoutInflater inflater, final ViewGroup container,
  19.                              Bundle savedInstanceState) {
  20.         // Inflate the layout for this fragment
  21.         final View rootview = inflater.inflate(R.layout.fragment_settings,container,false);
  22.         this.mView=rootview;
  23.         Task task=new Task();
  24.         task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
  25.         return rootview;
  26.         
  27.     }
  28.     
  29.     @Deprecated
  30.     public class Task extends AsyncTask&lt;Void,Void,Void&gt;{
  32.         @Override
  33.         protected Void doInBackground(Void... voids) {
  34.             final CustomViewPager viewPager = mView.findViewById(R.id.ViewPager);
  35.             viewPager.setAdapter(new Adapter(getFragmentManager()));
  36.             viewPager.setCurrentItem(1);
  37.             viewPager.setOffscreenPageLimit(1);
  38.             viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
  39.                 @Override
  40.                 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
  42.                 }
  44.                 @Override
  45.                 public void onPageSelected(int position) {
  46.                     if (position == 0) {
  47.                         viewPager.setPagingEnabled(false);
  48.                     }
  49.                 }
  51.                 @Override
  52.                 public void onPageScrollStateChanged(int state) {
  54.                 }
  55.             });
  56.             return null;
  57.         }
  58.     }
  60. }

The xml layout file for fragment:

  1. &lt;androidx.constraintlayout.widget.ConstraintLayout xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
  2.                                                    xmlns:tools=&quot;http://schemas.android.com/tools&quot;
  3.                                                    xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
  4.                                                    android:layout_height=&quot;match_parent&quot;
  5.                                                    android:layout_width=&quot;match_parent&quot;
  6.                                                    android:background=&quot;#fff&quot; android:animationCache=&quot;true&quot;
  7.                                                    android:id=&quot;@+id/SettingsFragmentContainer&quot;
  8.                                                    android:drawingCacheQuality=&quot;high&quot;&gt;
  11.         &lt;androidx.appcompat.widget.Toolbar
  12.                 android:layout_width=&quot;0dp&quot;
  13.                 android:layout_height=&quot;wrap_content&quot;
  14.                 android:background=&quot;?attr/colorPrimary&quot;
  15.                 android:theme=&quot;?attr/actionBarTheme&quot;
  16.                 android:minHeight=&quot;?attr/actionBarSize&quot; app:layout_constraintTop_toTopOf=&quot;parent&quot;
  17.                 app:layout_constraintStart_toStartOf=&quot;parent&quot;
  18.                 android:id=&quot;@+id/SettingsActivityToolbar&quot; app:layout_constraintEnd_toEndOf=&quot;parent&quot;/&gt;
  20.         &lt;TextView
  21.                 android:text=&quot;Settings&quot;
  22.                 android:layout_width=&quot;65dp&quot;
  23.                 android:layout_height=&quot;23dp&quot; app:layout_constraintTop_toTopOf=&quot;parent&quot;
  24.                 app:layout_constraintStart_toStartOf=&quot;parent&quot; android:layout_marginTop=&quot;18dp&quot;
  25.                 app:layout_constraintEnd_toEndOf=&quot;parent&quot; android:id=&quot;@+id/Settings_textview&quot;
  26.                 android:textAppearance=&quot;@style/ActionBar.nameText&quot;/&gt;
  27.         &lt;ImageButton
  28.                 android:layout_width=&quot;46dp&quot;
  29.                 android:layout_height=&quot;34dp&quot; app:srcCompat=&quot;@drawable/settings_icon_back&quot;
  30.                 android:id=&quot;@+id/backPressButton&quot;
  31.                 android:rotation=&quot;180&quot; android:backgroundTint=&quot;#fff&quot;
  32.                 android:background=&quot;@null&quot;
  33.                 app:layout_constraintStart_toStartOf=&quot;@+id/SettingsActivityToolbar&quot;
  34.                 android:layout_marginStart=&quot;2dp&quot; app:layout_constraintTop_toTopOf=&quot;parent&quot;
  35.                 android:layout_marginTop=&quot;16dp&quot; android:onClick=&quot;click&quot; android:drawingCacheQuality=&quot;high&quot;/&gt;
  36.         &lt;TextView
  37.                 android:text=&quot;&quot;
  38.                 android:layout_width=&quot;0dp&quot;
  39.                 android:layout_height=&quot;0.1dp&quot; app:layout_constraintStart_toStartOf=&quot;parent&quot;
  40.                 app:layout_constraintEnd_toEndOf=&quot;parent&quot; android:id=&quot;@+id/linebreak1&quot; android:layout_marginTop=&quot;10dp&quot;
  41.                 app:layout_constraintTop_toBottomOf=&quot;@+id/backPressButton&quot; android:background=&quot;#A1A8AC&quot;/&gt;
  42.         &lt;Switch
  43.                 android:text=&quot;Test Test&quot;
  44.                 android:layout_width=&quot;0dp&quot;
  45.                 android:layout_height=&quot;47dp&quot; android:id=&quot;@+id/switch4&quot;
  46.                 android:textAppearance=&quot;@style/ActionBar.nameText&quot; app:layout_constraintStart_toStartOf=&quot;parent&quot;
  47.                 android:layout_marginStart=&quot;25dp&quot; android:layout_marginEnd=&quot;25dp&quot;
  48.                 app:layout_constraintEnd_toEndOf=&quot;parent&quot; android:thumbTint=&quot;@drawable/switch_thumb_selector&quot;
  49.                 android:trackTint=&quot;@drawable/switch_track_selector&quot; android:layout_marginTop=&quot;18dp&quot;
  50.                 app:layout_constraintTop_toBottomOf=&quot;@+id/backPressButton&quot; tools:ignore=&quot;UseSwitchCompatOrMaterialXml&quot;/&gt;
  51.         &lt;TextView
  52.                 android:layout_width=&quot;0dp&quot;
  53.                 android:layout_height=&quot;0.1dp&quot; android:id=&quot;@+id/linebreak2&quot;
  54.                 app:layout_constraintStart_toStartOf=&quot;parent&quot;
  55.                 android:layout_marginStart=&quot;25dp&quot; android:layout_marginEnd=&quot;25dp&quot;
  56.                 app:layout_constraintEnd_toEndOf=&quot;parent&quot; android:background=&quot;#A1A8AC&quot;
  57.                 android:layout_marginTop=&quot;10dp&quot; app:layout_constraintTop_toBottomOf=&quot;@+id/switch4&quot;/&gt;
  58.         &lt;TextView
  59.                 android:layout_width=&quot;0dp&quot;
  60.                 android:layout_height=&quot;67dp&quot; android:id=&quot;@+id/update&quot;
  61.                 app:layout_constraintStart_toStartOf=&quot;parent&quot;
  62.                 app:layout_constraintEnd_toEndOf=&quot;parent&quot;
  63.                 android:clickable=&quot;true&quot;
  64.                 android:textAppearance=&quot;@style/ActionBar.nameText&quot; app:layout_constraintHorizontal_bias=&quot;0.0&quot;
  65.                 android:background=&quot;?attr/selectableItemBackground&quot; android:layout_marginTop=&quot;16dp&quot;
  66.                 app:layout_constraintTop_toBottomOf=&quot;@+id/switch4&quot; android:onClick=&quot;onClickUpdate&quot;/&gt;
  67.         &lt;TextView
  68.                 android:text=&quot;Current Version 1.0.1&quot;
  69.                 android:layout_width=&quot;wrap_content&quot;
  70.                 android:clickable=&quot;true&quot;
  71.                 android:layout_height=&quot;0dp&quot; android:id=&quot;@+id/enter_version&quot;
  72.                 app:layout_constraintTop_toTopOf=&quot;@+id/update&quot;
  73.                 android:layout_marginTop=&quot;36dp&quot; android:layout_marginEnd=&quot;206dp&quot;
  74.                 app:layout_constraintEnd_toEndOf=&quot;@+id/update&quot;/&gt;
  75.         &lt;TextView
  76.                 android:text=&quot;Check Update&quot;
  77.                 android:layout_width=&quot;wrap_content&quot;
  78.                 android:layout_height=&quot;wrap_content&quot;
  79.                 android:clickable=&quot;true&quot;
  80.                 android:id=&quot;@+id/update_textview&quot;
  81.                 android:textAppearance=&quot;@style/ActionBar.nameText&quot; android:layout_marginEnd=&quot;228dp&quot;
  82.                 app:layout_constraintEnd_toEndOf=&quot;@+id/update&quot; app:layout_constraintTop_toTopOf=&quot;@+id/update&quot;
  83.                 android:layout_marginTop=&quot;10dp&quot;/&gt;
  84.         &lt;com.testapp.test2.CustomViewPager
  85.                 android:layout_width=&quot;0dp&quot;
  86.                 android:layout_height=&quot;0dp&quot;
  87.                 app:layout_constraintStart_toStartOf=&quot;parent&quot; app:layout_constraintEnd_toEndOf=&quot;parent&quot;
  88.                 android:id=&quot;@+id/ViewPager&quot; app:layout_constraintTop_toTopOf=&quot;parent&quot;
  89.                 app:layout_constraintBottom_toBottomOf=&quot;parent&quot;/&gt;
  90. &lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;

Adapter.java

  1. public class Adapter extends FragmentStatePagerAdapter {
  3.     public Adapter(FragmentManager fragmentManager){
  4.         super(fragmentManager,BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
  6.     }
  7.     @NonNull
  8.     @NotNull
  9.     @Override
  10.     public Fragment getItem(int position) {
  11.         if(position==0){
  13.             return new BlankFragment();
  14.         }
  15.         if(position==1){
  17.             return new SettingsFragment();
  18.         }
  20.             return null;
  21.         }
  24.     @Override
  25.     public int getCount() {
  26.         return 2;
  27.     }
  28. }

Logcat:

  1. 2020-10-15 07:51:34.234 14029-14034/com.testapp.test2 I/zygote64: Increasing code cache capacity to 1024KB
  2. 2020-10-15 07:51:35.302 14029-14029/com.testapp.test2 I/Choreographer: Skipped 165 frames!  The application may be doing too much work on its main thread.
  3. 2020-10-15 07:51:50.250 14029-14034/com.testapp.test2 I/zygote64: Do full code cache collection, code=502KB, data=324KB
  4. 2020-10-15 07:51:50.252 14029-14034/com.testapp.test2 I/zygote64: After code cache collection, code=501KB, data=287KB
  5. 2020-10-15 07:51:51.006 14029-14034/com.testapp.test2 I/zygote64: Do partial code cache collection, code=503KB, data=297KB
  6. 2020-10-15 07:51:51.007 14029-14034/com.testapp.test2 I/zygote64: After code cache collection, code=503KB, data=297KB
  7. 2020-10-15 07:51:51.007 14029-14034/com.testapp.test2 I/zygote64: Increasing code cache capacity to 2MB
  8. 2020-10-15 07:51:51.886 14029-14034/com.testapp.test2 I/zygote64: Compiler allocated 8MB to compile void android.view.ViewRootImpl.performTraversals()
  9. 2020-10-15 07:51:54.868 14029-14029/com.testapp.test2 I/TouchMotionHandler: handler onDetached

How do I fix this?

EDIT:

  1. java.lang.NullPointerException: Attempt to invoke virtual method &#39;void androidx.fragment.app.Fragment.setMenuVisibility(boolean)&#39; on a null object reference
  2. at androidx.fragment.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:189)
  3. at androidx.viewpager.widget.ViewPager.addNewItem(ViewPager.java:1010)
  4. at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1158)
  5. at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092)
  6. at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622)
  7. at android.view.View.measure(View.java:22251)
  8. at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:763)
  9. at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.measure(BasicMeasure.java:426)
  10. at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:335)
  11. at androidx.constraintlayout.solver.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:117)
  12. at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1532)
  13. at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1607)
  14. at android.view.View.measure(View.java:22251)
  15. at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:763)
  16. at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.measure(BasicMeasure.java:426)
  17. at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.measureChildren(BasicMeasure.java:105)
  18. at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:247)
  19. at androidx.constraintlayout.solver.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:117)
  20. at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1532)
  21. at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1607)
  22. at android.view.View.measure(View.java:22251)
  23. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
  24. at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
  25. at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:146)
  26. at android.view.View.measure(View.java:22251)
  27. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
  28. at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
  29. at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
  30. at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
  31. at android.view.View.measure(View.java:22251)
  32. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
  33. at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
  34. at android.view.View.measure(View.java:22251)
  35. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
  36. at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
  37. at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
  38. at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
  39. at android.view.View.measure(View.java:22251)
  40. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
  41. at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
  42. at com.android.internal.policy.DecorView.onMeasure(DecorView.java:898)
  43. at android.view.View.measure(View.java:22251)
  44. at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2500)
  45. at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1564)
  46. at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1826)
  47. at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1446)
  48. at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6954)
  49. at android.view.Choreographer$CallbackRecord.run(Choreographer.java:925)
  50. at android.view.Choreographer.doCallbacks(Choreographer.java:737)
  51. at android.view.Choreographer.doFrame(Choreographer.java:669)
  52. 2020-10-16 00:56:36.824 14663-14663/com.testapp.test2 E/AndroidRuntime:     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:911)
  53. at android.os.Handler.handleCallback(Handler.java:790)
  54. at android.os.Handler.dispatchMessage(Handler.java:99)
  55. at android.os.Looper.loop(Looper.java:192)
  56. at android.app.ActivityThread.main(ActivityThread.java:6702)
  57. at java.lang.reflect.Method.invoke(Native Method)
  58. at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
  59. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)

答案1

得分: 0

我通过将构建类型从调试更改为发布来修复了它。

英文:

I fixed it by changing the build type from debug to release.

huangapple
  • 本文由 发表于 2020年10月15日 23:06:36
  • 转载请务必保留本文链接：https://go.coder-hub.com/64374555.html
  • android
  • android-asynctask
  • android-fragments
  • android-viewpager
  • java
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