点击一个按钮，打开一个片段？ [英] Click a button to open a Fragment?

问题描述

我有一个ViewPager中，我能4种不同的标签（这是片段），我创建的查看。在我的片段中的一个，我想有一个会，当我点击网页上的一个按钮，替换另一个片段该视图按钮。现在我不想刷卡到另一个选项卡，我只知道一味要替换当前片段的视图时，我preSS该按钮。这里是我的尝试，但我不知道为什么，当我点击我的按钮，没有任何反应。如果有人可以帮助我，将是巨大的。谢谢！

I have a ViewPager in which I am able to view between 4 different tabs (which are fragments) I created. In one of my fragments, I want to have a button that will, after I click a button on that page, replace that view with another fragment. Now I don't want to swipe to another tab, I just merely want to replace the view of the current fragment when I press that button. Here is my attempt, but I'm not sure why when I click my button, nothing happens. If anyone could help me that would be great. Thanks!

这是我片段呼吁创造preSS我想要的视图和按钮。

This is the Fragment I call to create the view and the button I want to press.

ManualSelection.java

ManualSelection.java

public class ManualSelection extends Fragment {

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.activity_manual_selection, container, false);
        intent = new Intent(getActivity(), ManualSelectionListView.class);
        return rootView;
    }

    public void onActivityCreated (Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Button listViewGenerated = (Button) getActivity().findViewById(R.id.manual_generate);
        listViewGenerated.setOnClickListener(new View.OnClickListener() {
            @TargetApi(Build.VERSION_CODES.HONEYCOMB)
            @Override
            public void onClick(View v) {
                FragmentManager fm = getActivity().getFragmentManager();
                FragmentTransaction ft = fm.beginTransaction();
                ft.replace(R.id.listView_manual, new ManualSelectionListView());
                ft.commit();
            }

        });
    }
}

这里是我要创建的片段

And here is the Fragment I want to create

ManualSelectionListView.java

ManualSelectionListView.java

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class ManualSelectionListView extends Fragment {

static final String[] MOBILE_OS =
        new String[] { "Android", "iOS", "WindowsMobile", "Blackberry"};

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

    ListView lv = (ListView)rootView.findViewById(R.id.listview);
    lv.setAdapter(new MobileArrayAdapter(getActivity(),MOBILE_OS));

    return rootView;
}
}

这是我的XML文件：

activity_manual_selection.xml

activity_manual_selection.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.ecs160.homestay.ManualSelection"
    android:id="@+id/fragmentTest"> 

 <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Generate"
    android:id="@+id/manual_generate"
    android:layout_centerHorizontal="true"
    android:onClick="generateListView"/>

这是包含XML文件名为listview.xml R.id.listView_manual

And here is the XML file called listview.xml that contains R.id.listView_manual

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/listView_manual">

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/listview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</LinearLayout>

我什么也没有显示时，我打生成。有任何想法吗？谢谢！

I get nothing displayed when I hit "Generate." Any ideas? Thanks!

推荐答案

的问题是，你想从你的主要活动按钮的ID，这将返回null

The problem is that you are trying to get the Button id from your main activity which will return null

        Button listViewGenerated = (Button) getActivity().findViewById(R.id.manual_generate);

按钮 manual_generate 位于您的 activity_manual_selection 布局不是在你的主要业务的布局，你不能从不同的布局视图否则将返回null

Button manual_generate is located in your activity_manual_selection layout not in your Main activity's layout you cant get view from different layout or else it will return null

解决方案：

从你的片段布局获取按钮的id

Get the Button's id from your fragment's layout

public class ManualSelection extends Fragment {

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                     Bundle savedInstanceState) {

    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.activity_manual_selection, container, false);
    intent = new Intent(getActivity(), ManualSelectionListView.class);

   Button listViewGenerated = (Button) rootView.findViewById(R.id.manual_generate);
    listViewGenerated.setOnClickListener(new View.OnClickListener() {
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        @Override
        public void onClick(View v) {
            FragmentManager fm = getActivity().getFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            ft.replace(R.id.listView_manual, new ManualSelectionListView());
            ft.commit();
        }

    });

    return rootView;
}

删除 onActivityCreated

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