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Question

我正在尝试将FloatingActionButton添加到FloatingActionMenu 但是在启动FloatingActionButton期间无法获取上下文所有方法都返回null

这是我的片段调用

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.getbase.floatingactionbutton.FloatingActionButton;
import com.getbase.floatingactionbutton.FloatingActionsMenu;
import demo.com.example.syed.test.R;
public class stdDetails extends android.support.v4.app.Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    FloatingActionMenu detailsfabmenu=(FloatingActionMenu)Container.findViewById(R,id,std_Main_Detials_fab_menu);
    FoatingActionButton(getContext());
    detailsfabmenu.addButton(changename);
    return inflater.inflate(R.layout.stddetailsfragment,container,false);
}}

码

FloatingActionButton changename=new FloatingActionButton(getContext());

返回null值我甚至尝试过基于avilabel答案的选项

FloatingActionButton changename=new FloatingActionButton(container.getContext());

FloatingActionButton changename=new FloatingActionButton(getActivity().getApplicationContext());

FloatingActionButton changename=new FloatingActionButton(this.getContext());

FloatingActionButton changename=new FloatingActionButton(this.getActivity().getApplicationContext());

这是这里提供的所有答案 Using context in a fragment

Answer 1

这是初始化FAB的方法：

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fabBtn);

此处fabBtn是布局XML文件中FAB的ID。

更新

使用以下代码行：

FloatingActionButton changename=new FloatingActionButton(getBaseContext());

Answer 2

您应该从MainActivity调用您的浮动操作按钮

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fabBtn);
fab.show().

如果要显示特定片段的fab，可以使用片段标记：

Fragment fragmentA = new FragmentA();
getFragmentManager().beginTransaction()
.replace(R.id.MainFrameLayout,fragmentA,"YOUR_TARGET_FRAGMENT_TAG")
.addToBackStack("YOUR_SOURCE_FRAGMENT_TAG").commit();

然后检查您是否在Mainactivity中有所需的片段：

 if(currentFrag.equals("YOUR_TARGET_FRAGMENT_TAG")){
        fab.show();
    }
    else
        fab.hide();

无法将FloatingActionButton添加到片段类中的FloatingActionMenu

2 个答案:

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