Android 移动同一屏幕时出现碎片错误

我从Github带来了开源。 但是，该代码设计为一次只按一个按钮

所以，一开始，我就改变了4个信息，让它们出现在屏幕上

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↑ 但是，当从屏幕A移回屏幕A时，出现了应用程序关闭的问题

当我检查它时，当我点击“垃圾桶图片”删除屏幕A上显示的4条信息，然后再次移动到屏幕A时，我没有任何问题

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所以，为了在切换屏幕时初始化屏幕，我做了谷歌搜索。 我将堆栈溢出中显示的代码放在下面的if/else语句中

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但是，当我再次从一个屏幕移动到另一个屏幕时，仍然会发生错误。我们如何解决它？如果我不能解决这个问题，我就不会修复这个开源

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错误代码：

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: kr.cds.jisulife, PID: 8226
              java.lang.NumberFormatException: null
                  at java.lang.Integer.parseInt(Integer.java:483)
                  at java.lang.Integer.valueOf(Integer.java:611)
                  at kr.cds.jisulife.BrainWhoIndex.getGradeToString(BrainWhoIndex.java:36)
                  at kr.cds.jisulife.WeatherFragment$ListViewAdapter.getView(WeatherFragment.java:452)
                  at android.widget.AbsListView.obtainView(AbsListView.java:2363)
                  at android.widget.ListView.measureHeightOfChildren(ListView.java:1326)
                  at android.widget.ListView.onMeasure(ListView.java:1233)
                  at android.view.View.measure(View.java:19857)
                  at android.support.constraint.ConstraintLayout.internalMeasureChildren(ConstraintLayout.java:934)
                  at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:973)
                  at android.view.View.measure(View.java:19857)
                  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
                  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:714)
                  at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
                  at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1391)
                  at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:784)
                  at android.view.View.measure(View.java:19857)
                  at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1081)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
                  at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
                  at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
                  at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
                  at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
                  at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
                  at com.android.internal.policy.DecorView.onMeasure(DecorView.java:689)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2275)
                  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1366)
                  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1619)
                  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
                  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6337)
                  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
                  at android.view.Choreographer.doCallbacks(Choreographer.java:686)
                  at android.view.Choreographer.doFrame(Choreographer.java:621)
                  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
                  at android.os.Handler.handleCallback(Handler.java:751)
                  at android.os.Handler.dispatchMessage(Handler.java:95)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6119)
                  at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    MosquitoFragment mosquitoFragment = new MosquitoFragment();
    WeatherFragment weatherFragment = new WeatherFragment();
    ExpressionFragment expressionFragment = new ExpressionFragment();
    AirFragment airFragment = new AirFragment();
    int id = item.getItemId();



    if (id == R.id.nav_weather) {
        // I inserted this point.
        transaction.replace(R.id.content_frame, weatherFragment);
    }

    else if (id == R.id.nav_mosquito) {
        // I inserted this point.
        transaction.replace(R.id.content_frame, mosquitoFragment);
    }

    else if (id == R.id.nav_expression) {
        // I inserted this point.
        transaction.replace(R.id.content_frame, expressionFragment);
    }

    else if (id == R.id.nav_air) {
        // I inserted this point.
        transaction.replace(R.id.content_frame, airFragment);
    }

    transaction.commit();

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: kr.cds.jisulife, PID: 8226
              java.lang.NumberFormatException: null
                  at java.lang.Integer.parseInt(Integer.java:483)
                  at java.lang.Integer.valueOf(Integer.java:611)
                  at kr.cds.jisulife.BrainWhoIndex.getGradeToString(BrainWhoIndex.java:36)
                  at kr.cds.jisulife.WeatherFragment$ListViewAdapter.getView(WeatherFragment.java:452)
                  at android.widget.AbsListView.obtainView(AbsListView.java:2363)
                  at android.widget.ListView.measureHeightOfChildren(ListView.java:1326)
                  at android.widget.ListView.onMeasure(ListView.java:1233)
                  at android.view.View.measure(View.java:19857)
                  at android.support.constraint.ConstraintLayout.internalMeasureChildren(ConstraintLayout.java:934)
                  at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:973)
                  at android.view.View.measure(View.java:19857)
                  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
                  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:714)
                  at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
                  at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1391)
                  at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:784)
                  at android.view.View.measure(View.java:19857)
                  at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1081)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
                  at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
                  at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
                  at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
                  at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
                  at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6083)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
                  at com.android.internal.policy.DecorView.onMeasure(DecorView.java:689)
                  at android.view.View.measure(View.java:19857)
                  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2275)
                  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1366)
                  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1619)
                  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
                  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6337)
                  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
                  at android.view.Choreographer.doCallbacks(Choreographer.java:686)
                  at android.view.Choreographer.doFrame(Choreographer.java:621)
                  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
                  at android.os.Handler.handleCallback(Handler.java:751)
                  at android.os.Handler.dispatchMessage(Handler.java:95)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6119)
                  at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)