Java 创建碎片的速度很慢
所以我有一个片段,它的发射速度非常慢,好像跳过了150多帧。 我试图在片段内部设置ViewPager,并添加onPageChangeListener,它在滑动到某个方向后禁用滑动 问题是它确实减慢了碎片装载速度。我尝试将它移动到一个单独的线程和异步任务,但仍然很慢 片段:Java 创建碎片的速度很慢,java,android,android-fragments,android-asynctask,android-viewpager,Java,Android,Android Fragments,Android Asynctask,Android Viewpager,所以我有一个片段,它的发射速度非常慢,好像跳过了150多帧。 我试图在片段内部设置ViewPager,并添加onPageChangeListener,它在滑动到某个方向后禁用滑动 问题是它确实减慢了碎片装载速度。我尝试将它移动到一个单独的线程和异步任务,但仍然很慢 片段: 公共类设置片段扩展片段{ 公众视野; 公共设置片段(){ } @凌驾 创建时的公共void(Bundle savedInstanceState){ super.onCreate(savedInstanceState); }
公共类设置片段扩展片段{
公众视野;
公共设置片段(){
}
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
}
@不赞成
@凌驾
创建视图上的公共视图(布局、充气机、最终视图组容器、,
Bundle savedInstanceState){
//为该碎片膨胀布局
最终视图根视图=充气机。充气(R.layout.fragment\u设置,容器,错误);
this.mView=rootview;
任务=新任务();
task.executeOnExecutor(异步task.THREAD\u POOL\u EXECUTOR);
返回rootview;
}
@不赞成
公共类任务扩展了异步任务{
@凌驾
受保护的空位背景(空位…空位){
最终CustomViewPager viewPager=mView.findViewById(R.id.viewPager);
setAdapter(新适配器(getFragmentManager());
viewPager.setCurrentItem(1);
viewPager.setOffscreenPageLimit(1);
viewPager.addOnPageChangeListener(新的viewPager.OnPageChangeListener(){
@凌驾
已滚动页面上的公共无效(int-position、float-positionOffset、int-positionOffsetPixels){
}
@凌驾
已选择页面上的公共无效(内部位置){
如果(位置==0){
viewPager.SetPaginEnabled(假);
}
}
@凌驾
公共无效onPageScrollStateChanged(int状态){
}
});
返回null;
}
}
}
片段的xml布局文件:
Adapter.java
公共类适配器扩展FragmentStatePagerAdapter{
公共适配器(碎片管理器碎片管理器){
超级(碎片管理器、行为\仅恢复\当前\碎片);
}
@非空
@NotNull
@凌驾
公共片段getItem(int位置){
如果(位置==0){
返回新的BlankFragment();
}
如果(位置==1){
返回新设置片段();
}
返回null;
}
@凌驾
public int getCount(){
返回2;
}
}
日志:
2020-10-15 07:51:34.234 14029-14034/com.testapp.test2 I/zygote64: Increasing code cache capacity to 1024KB
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.
2020-10-15 07:51:50.250 14029-14034/com.testapp.test2 I/zygote64: Do full code cache collection, code=502KB, data=324KB
2020-10-15 07:51:50.252 14029-14034/com.testapp.test2 I/zygote64: After code cache collection, code=501KB, data=287KB
2020-10-15 07:51:51.006 14029-14034/com.testapp.test2 I/zygote64: Do partial code cache collection, code=503KB, data=297KB
2020-10-15 07:51:51.007 14029-14034/com.testapp.test2 I/zygote64: After code cache collection, code=503KB, data=297KB
2020-10-15 07:51:51.007 14029-14034/com.testapp.test2 I/zygote64: Increasing code cache capacity to 2MB
2020-10-15 07:51:51.886 14029-14034/com.testapp.test2 I/zygote64: Compiler allocated 8MB to compile void android.view.ViewRootImpl.performTraversals()
2020-10-15 07:51:54.868 14029-14029/com.testapp.test2 I/TouchMotionHandler: handler onDetached
我该如何解决这个问题
编辑:
我通过将生成类型从调试更改为发行版来修复它。我通过将生成类型从调试更改为发行版来修复它。我的理解方式是,您有一个
SettingsFragement
,它显示一个ViewPager
,加载与第2页相同的SettingsFragement
,它包含同一个ViewPager
的另一个实例,处于一个永无止境的循环中,这会使它变慢。为什么SettingsFragment
是以这种方式递归的?如果我从适配器中删除SettingsFragment
,我会得到null指针异常。我在上面添加了logcat。@Andrew.帮帮我。你是如何删除设置片段的?您是否刚刚注释掉了返回新设置的片段()代码>行?如果这样做,肯定会生成NullPointerException,除非您还将getCount()
返回到1
,或者您可以用returnnewblankfragment()替换该行代码>我确实将getCount()
更改为1,但它仍然给我NullPointerException@如果将返回新设置片段()
替换为返回新的BlankFragment()
将创建另一个BlankFragment
,因为我设置了viewPager.setCurrentItem(1)
在我的设置片段的onCreate视图中,我的阅读方式是,你有一个设置片段
,它显示一个查看页面
,加载与第2页相同的设置片段
,其中包含相同查看页面
的另一个实例,循环不断,这会让它变慢。为什么SettingsFragment
是以这种方式递归的?如果我从适配器中删除SettingsFragment
,我会得到null指针异常。我在上面添加了logcat。@Andrew.帮帮我。你是如何删除设置片段的?您是否刚刚注释掉了返回新设置的片段()代码>行?如果这样做,肯定会生成NullPointerException,除非您还将getCount()
返回到1
,或者您可以用returnnewblankfragment()替换该行代码>我确实将getCount()
更改为1,但它仍然给我NullPointerException@Andrew将返回新设置片段()
替换为返回新的BlankFragment()
将创建另一个BlankFragment
,因为我在设置片段的onCreate视图中设置了viewPager.setCurrentItem(1)
java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.fragment.app.Fragment.setMenuVisibility(boolean)' on a null object reference
at androidx.fragment.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:189)
at androidx.viewpager.widget.ViewPager.addNewItem(ViewPager.java:1010)
at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1158)
at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092)
at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622)
at android.view.View.measure(View.java:22251)
at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:763)
at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.measure(BasicMeasure.java:426)
at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:335)
at androidx.constraintlayout.solver.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:117)
at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1532)
at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1607)
at android.view.View.measure(View.java:22251)
at androidx.constraintlayout.widget.ConstraintLayout$Measurer.measure(ConstraintLayout.java:763)
at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.measure(BasicMeasure.java:426)
at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.measureChildren(BasicMeasure.java:105)
at androidx.constraintlayout.solver.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:247)
at androidx.constraintlayout.solver.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:117)
at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1532)
at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1607)
at android.view.View.measure(View.java:22251)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:146)
at android.view.View.measure(View.java:22251)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
at android.view.View.measure(View.java:22251)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:22251)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
at android.view.View.measure(View.java:22251)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6767)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:898)
at android.view.View.measure(View.java:22251)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2500)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1564)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1826)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1446)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6954)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:925)
at android.view.Choreographer.doCallbacks(Choreographer.java:737)
at android.view.Choreographer.doFrame(Choreographer.java:669)
2020-10-16 00:56:36.824 14663-14663/com.testapp.test2 E/AndroidRuntime: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:911)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:192)
at android.app.ActivityThread.main(ActivityThread.java:6702)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)