setOnClickListener FloatingActionButton on Fragment Error

-2

我是Android Studio中的Fragment和FloatingActionButtons的新手。我一直試圖獲得FloatingActionButtonsetOnClickListener，但每次運行該程序時，都會收到一條錯誤消息，我無法弄清楚如何解決。我知道在這裏也有很多其他的問題，雖然我已經通過了他們，但仍然無法解決，我是一個完全的新手，並且提前感謝您的幫助。setOnClickListener FloatingActionButton on Fragment Error

下面是FloatingActionButton的XML代碼：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true" 
xmlns:fab="http://schemas.android.com/apk/res-auto" 
tools:context="com.example.user.health.IceOneActivity"> 

<android.support.design.widget.AppBarLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:theme="@style/AppTheme.AppBarOverlay"> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:background="?attr/colorPrimary" 
     app:popupTheme="@style/AppTheme.PopupOverlay" /> 

</android.support.design.widget.AppBarLayout> 

<include layout="@layout/content_ice_one" /> 

<android.support.v4.view.ViewPager 
    android:id="@+id/viewpager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

<android.support.design.widget.FloatingActionButton 
    android:id="@+id/editInfo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="230dp" 
    android:layout_gravity="bottom|end" 
    android:layout_marginRight="@dimen/fab_margin" 
    android:visibility="invisible" 
    app:backgroundTint="@color/colorFAB3" 
    app:elevation="6dp" 
    app:pressedTranslationZ="12dp" 
    app:fab_title="Edit" 
    android:src="@drawable/ic_create_white_24dp" /> 
<android.support.design.widget.FloatingActionButton 
    android:id="@+id/saveInfo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="160dp" 
    android:layout_gravity="bottom|end" 
    android:layout_marginRight="@dimen/fab_margin" 
    android:visibility="invisible" 
    app:elevation="6dp" 
    app:backgroundTint="@color/colorFAB2" 
    app:pressedTranslationZ="12dp" 
    app:fab_title="Save" 
    android:src="@drawable/ic_save_white_24dp" /> 
<android.support.design.widget.FloatingActionButton 
    android:id="@+id/showInfo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="90dp" 
    android:layout_gravity="bottom|end" 
    android:layout_marginRight="@dimen/fab_margin" 
    android:visibility="invisible" 
    app:elevation="6dp" 
    app:backgroundTint="@color/colorFAB1" 
    app:pressedTranslationZ="12dp" 
    fab:fab_title="Done" 
    android:src="@drawable/ic_check_white_24dp" /> 
<android.support.design.widget.FloatingActionButton 
    android:id="@+id/moreInfo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="bottom|end" 
    app:elevation="6dp" 
    app:backgroundTint="@color/colorAccent" 
    app:pressedTranslationZ="12dp" 
    android:layout_margin="@dimen/fab_margin" 
    android:src="@drawable/ic_add_white_24dp" />

這裏是java活動：

public class IceOneActivity extends Fragment implements View.OnClickListener { 

private Boolean isFabOpen = false; 
private FloatingActionButton moreInfo,saveInfo,editInfo,showInfo; 
private Animation fab_open,fab_close,rotate_forward,rotate_backward; 

public IceOneActivity() { 
    // Required empty public constructor 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View iceOneView = inflater.inflate(R.layout.content_ice_one, container, false); 

    //myFragmentView 
    moreInfo = (FloatingActionButton) inflater.inflate(R.layout.content_ice_one, container, false).findViewById(R.id.moreInfo); 
    saveInfo = (FloatingActionButton) inflater.inflate(R.layout.content_ice_one, container, false).findViewById(R.id.saveInfo); 
    editInfo = (FloatingActionButton) inflater.inflate(R.layout.content_ice_one, container, false).findViewById(R.id.editInfo); 
    showInfo = (FloatingActionButton) inflater.inflate(R.layout.content_ice_one, container, false).findViewById(R.id.showInfo); 
    fab_open = AnimationUtils.loadAnimation(getActivity(), R.anim.fab_open); 
    fab_close = AnimationUtils.loadAnimation(getActivity(),R.anim.fab_close); 
    rotate_forward = AnimationUtils.loadAnimation(getActivity(),R.anim.rotate_forward); 
    rotate_backward = AnimationUtils.loadAnimation(getActivity(), R.anim.rotate_backward); 
    moreInfo.setOnClickListener(this); 
    saveInfo.setOnClickListener(this); 
    editInfo.setOnClickListener(this); 
    showInfo.setOnClickListener(this); 

    return iceOneView; 
} 

@Override 
public void onClick(View v) { 
    int id = v.getId(); 
    switch (id){ 
     case R.id.moreInfo: 

      animateFAB(); 
      break; 
     case R.id.saveInfo: 

      Log.d("1", "Fab 1"); 
      break; 
     case R.id.editInfo: 

      Log.d("2", "Fab 2"); 
      break; 
     case R.id.showInfo: 

      Log.d("3", "Fab 3"); 
      break; 
    } 
}

這裏是應用程序的logcat的時候我嘗試運行活動：

Process: com.example.user.health, PID: 13237 
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.FloatingActionButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 
at com.example.user.health.IceOneActivity.onCreateView(IceOneActivity.java:44) 
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962) 
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067) 
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248) 
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738) 
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613) 
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570) 
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 
at android.support.v4.view.ViewPager.populate(ViewPager.java:1106) 
at android.support.v4.view.ViewPager.populate(ViewPager.java:952) 
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1474) 
at android.view.View.measure(View.java:18893) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5966) 
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:610) 
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:677) 
at android.view.View.measure(View.java:18893) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5966) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
at android.view.View.measure(View.java:18893) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5966) 
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
at android.view.View.measure(View.java:18893) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5966) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.view.View.measure(View.java:18893) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5966) 
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
at android.view.View.measure(View.java:18893) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5966) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2693) 
at android.view.View.measure(View.java:18893) 
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2192) 
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1271) 
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1510) 
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1162) 
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6229) 
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:873) 
at android.view.Choreographer.doCallbacks(Choreographer.java:676) 
at android.view.Choreographer.doFrame(Choreographer.java:606) 
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:859) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:168) 
at android.app.ActivityThread.main(ActivityThread.java:5845) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:687)

來源

2016-03-23 underscore_

你只需要膨脹你的觀點一次。這就是這條線（內IceOneActivity）：

View iceOneView = inflater.inflate(R.layout.content_ice_one, container, false);

然後，你可以從這個膨脹的觀點得到你FloatingActionButton實例的引用：

moreInfo = (FloatingActionButton) iceOneView.findViewById(R.id.moreInfo); 
saveInfo = (FloatingActionButton) iceOneView.findViewById(R.id.saveInfo); 
editInfo = (FloatingActionButton) iceOneView.findViewById(R.id.editInfo); 
showInfo = (FloatingActionButton) iceOneView.findViewById(R.id.showInfo);

來源

2016-03-23 22:26:22

謝謝大家的幫助，我已經做了你說的話雖然IM仍然收到此錯誤：'顯示java.lang.NullPointerException：試圖調用虛擬方法'無效android.support.design.widget.FloatingActionButton.setOnClickListener（android.view.View $ OnClickListener）'在空對象引用上' –

@ geek101上面發佈的xml文件的名稱是什麼？它是不是'content_ice_one'？ –

上面發佈的xml文件是'app_bar_ice_one.xml'，但是'content_ice_one'是內容所在的位置。 –

的FloatingActionButton被放置在活動佈局，你是從片段佈局這就是爲什麼你會得到空指針異常膨脹它，你沒有這樣做，只是把它從活動：

moreInfo = (FloatingActionButton)getActivity().findViewById(R.id.moreInfo);

來源

2016-03-23 21:52:19

你不必一次又一次膨脹片段視圖使用此 -

inflater.inflate(R.layout.content_ice_one, container, false)

你已經這樣做一次 -

View iceOneView = inflater.inflate(R.layout.content_ice_one, container, false);

您應該使用iceOneView使用實例化的按鈕 -

moreInfo = (FloatingActionButton) iceOneView.findViewById(R.id.moreInfo);

來源

2016-03-23 22:26:40

setOnClickListener FloatingActionButton on Fragment Error

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