使用ViewPager在Fragment中创建Listview

Question

我正在努力开发像facebook这样的时间轴.

你看,我有一个ViewPager来导航用户之间的"片段",如feed,profile,about等.

我有"main.xml",就像这样只有viewpager;

<android.support.v4.view.ViewPager
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</android.support.v4.view.ViewPager>

我还有fragmenta.xml,fragmentb.xml,fragmentc.xml.让我们检查一下fragmenta.xml,在里面,我把;

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFCC00"
    tools:context=".FragmentA" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" 
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true">
    </ListView>

</FrameLayout>

并使singlerow.xml将这些框创建为这样的时间轴;

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:background="#e67e22" 
        android:layout_margin=" 5dp">

        <ImageView
            android:layout_marginTop="5dp"
            android:layout_marginBottom="0dp"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:id="@+id/imageView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/s1" />

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:weightSum="1">

            <TextView
                android:id="@+id/textView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.5"
                android:layout_gravity="left"
                android:textAlignment="gravity"
                android:text="16 likes"/>

            <TextView
                android:id="@+id/textView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.5"
                android:layout_gravity="right"
                android:textAlignment="gravity"
                android:text="43mins ago"/>

        </LinearLayout>

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:weightSum="1">

            <Button
                android:id="@+id/button1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.5"
                android:layout_gravity="left"
                android:textAlignment="gravity"
                android:text="Like" />

            <Button
                android:id="@+id/button2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.5"
                android:layout_gravity="right"
                android:textAlignment="gravity"
                android:text="Share"/>

        </LinearLayout>
</LinearLayout>

我只使用一个静态盒子就可以了.但是当我尝试运行这个结构时,我在调试模式上出现错误"Source not found EDIT SOURCE LOOKUP PATH"

在我尝试将关于listview的适配器和其他内容放入fragmentA.java之后;

import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnCreateContextMenuListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class FragmentA extends Fragment {

    ListView list;
    String[] sLikes;
    String[] sTimes;
    int[] images={R.drawable.p1, R.drawable.p2,R.drawable.p3};

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_a,container,false);

        Resources res = getResources();
        sLikes=res.getStringArray(R.array.likes);
        sTimes=res.getStringArray(R.array.times);

        list = (ListView) findViewById(R.id.listView1);
        sAdapter adapter = new sAdapter(this, sLikes, images, sTimes);
        list.setAdapter(adapter);
    }    


    class sAdapter extends ArrayAdapter<String>
    {
        Context context;
        int[] images;
        String[] likesArray;
        String[] timesArray;
        sAdapter(Context c,String[] likes, int imgs[], String[] tms)
        {
            super(c,R.layout.singlerow,R.id.textView2,likes);
            this.context=c;
            this.images=imgs;
            this.likesArray=likes;
            this.timesArray=tms;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            //converting to java object
            LayoutInflater inflater= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View row=inflater.inflate(R.layout.singlerow,parent,false);

            ImageView myImage= (ImageView) row.findViewById(R.id.imageView1);
            TextView myLikes = (TextView) row.findViewById(R.id.textView);
            TextView myTimes = (TextView) row.findViewById(R.id.textView1);

            myImage.setImageResource(images[position]);
            myLikes.setText(likesArray[position]);
            myTimes.setText(timesArray[position]);

            return row;
        }
    }
}

但在这里,

list = (ListView) findViewById(R.id.listView1);
CapsAdapter adapter = new CapsAdapter(this, capsLikes, images, capsTimes);

findViewByIdCapsAdapter用红色加下划线的新...

我在这里想念的是什么 我不应该触摸内心FragmentA.java？我会创建另一个java文档？请帮我解决这个问题.

- 我创建了SingleRow/Bow结构,我在其中创建了Fragments/putted adapter等,我将它们拉入mainactivity.java文件中.

任何人都可以帮我这个吗？谢谢.

Answer 1

首先是你的调试控制台错误,你可以在这个答案的评论中找到一个解决方案:在Eclipse中调试我的Java代码时,我得到"Source not found".
然后,"红色下划线",这是因为Fragments不是完全像Activity.您应该阅读本文:碎片与活动.有一个例子可以看到在Fragment中,您必须执行以下操作:

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // select an layout to inflate
    View view = inflater.inflate(R.layout.fragment_a,container,false);

    Resources res = getResources();
    sLikes=res.getStringArray(R.array.likes);
    sTimes=res.getStringArray(R.array.times);

    // call the views with this layout
    list = (ListView) view.findViewById(R.id.listView1); 
    // you see, you need to find the view with "view.find..."

    sAdapter adapter = new sAdapter(getActivity(), sLikes, images, sTimes);
    list.setAdapter(adapter);

    // return the view
    return view;
}    

此外,"新的CapsAdapter也强调为红色",因为您需要将Context附加到适配器.这是一个上下文,但它不适用于片段.您需要找到以下内容:

// Get the Context in Activity
MainActivity.this or this  
// Get the Context from Fragments 
getActivity()  
getApplicationContext()  

最后,您可以在其他文件Class中创建适配器,如果有多个ListView使用相同的适配器创建一个.

希望这可以帮助.

更新:
例如,要创建列表视图并将其设置为适配器,请执行以下操作:

// declare the Adapter
MyAdapter adapter = new MyAdapter(
                         this, // to attach the adapter to a context, an activity
                         MyFirstItem, // an item (string...)  
                         MySecondItem, // an other (image...)  
                         MyOtherItem // and another...  
                    ); // end of my adapter  

在适配器中,您可以指定它的性质:

// this method says:
// "hello, i'm an adapter and I am made with..."
sAdapter(
      Context c, // "..a context.." (an attachment)
      String[] MyFirstItem, // "..a first item which is a string array.."
      int MySecondItem[], // "..a second, an image.."
      String[] MyOtherItem // etc
)  

要工作,你应该将适配器"附加"到"它正在构建的地方"=> Activity => Context.要声明上下文,您有以下示例:

1. NameOfActivity.this或者this,例如:

   要退出活动,你做MainActivity.this.finish(); 或者this.finish()

2. getActivity()例如:

   与上面相同,但这次你做getActivity().finish(); 如果你不是在 Activity类中.

3. getApplicationContext():

   要改变一点,你想从一个片段做一个Toast,你应该这样做:Toast.makeText(getApplicationContext(),"我在片段......",Toast.LENGTH_LONG).show();

希望它更容易理解.