ListFragment与自定义适配器

Question

我在项目中设置了listfragment。但似乎我的片段不能用我的适配器正确。这是因为Context context中的MyListAdapter。如果我点击纠正它。它变成了MenuFragment menuFragment。但在此更改后，MyListAdapter出错了。所以我纠正它。它变成了Context context。如果我纠正它，它仍然会继续下去。它的循环就像那样。

注意：我想要实现的是带有图标的ListFragment。就像我以前的其他问题一样（但遗憾的是没有人回答）。

public class MenuFragment extends ListFragment {


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return super.onCreateView(inflater, container, savedInstanceState);  
    }

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

     String [] proMenu ={ "Homies", "Best Nearby", "Coupon" , "Profile" , "History" , "", "Setting" ,
               "About" , "Sign Out"};

     setListAdapter(new MyListAdapter(this, proMenu));

}

@Override
public void onListItemClick(ListView lv, View v, int position, long id) {
    Fragment newContent = null;
    switch (position) {
    case 0:
        newContent = new ColorFragment();
        break;
    case 1:
        Intent intent7 = new Intent();
        intent7.setClass(getActivity(), Home.class);
        intent7.putExtra("index", position);
        startActivity(intent7);
        break;

编辑：这是我的布局。现在完全没问题。我只需要调整textview和线性布局，这样这个词就不会被切成两半。但我面临另一个问题。它就像背景图像相互堆积在一起。这是我布局上的xml。

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

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal" 
android:cacheColorHint="#00000000" 
android:background="@drawable/menu_drawer">  

<ImageView
    android:id="@+id/row_icon"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:padding="10dp"
    android:src="@drawable/ic_launcher" />

<TextView
    android:id="@+id/row_title"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:gravity="center_vertical"
    android:padding="10dp"
    android:text="Medium Text"
    android:textSize="20dp"
    android:textAppearance="@android:style/TextAppearance.Medium" />

</LinearLayout>

如果我从android:background="@drawable/menu_drawer"中移除此linear layout。这将是完美的背景。没有相互堆积。但当我在列表中滑动时，背景变得疯狂，它消失了，并在其中显示出一些黑色背景。它就像listview android:cacheColorHint="#00000000"的问题一样。我已在cachecolor中添加了linear layout。但它仍然显示那些黑色背景。就像这样。

我知道问题是什么。因为默认背景是黑色的。但我不知道如何解决它。

EDIT2：解决了黑色问题。

解决。

Answer 1

您没有将有效Context传递给适配器，Fragment 不 Context。例如，您需要使用Activity作为Context：

setListAdapter(new MyListAdapter(getActivity(), proMenu));

我希望你也在适配器中实现getCount()方法，否则你不会在ListView中看到任何内容，无论你有多少元素。

Answer 2

Following is the method to create listFragement list view:
HealthAdvice.java

package com.example.babs;


import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class HealthAdvice extends ListFragment {

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

        View rootView = inflater.inflate(R.layout.health_advice, container, false);

        return rootView;

    }

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

        HealthAdviceArray health_data[] = new HealthAdviceArray[]
                {
                new HealthAdviceArray(R.drawable.ic_launcher, "Cloudy"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Showers"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Snow"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Storm"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Sunny")
                };

        HealthAdviceAdapter adapter = new HealthAdviceAdapter(getActivity(), 
                R.layout.health_advice_item_row, health_data);

        /** Setting the array adapter to the list view */
        setListAdapter(adapter);

    }

}// end main class HealthAdvice

Step 2:

HealthAdviceAdapter.java
package com.example.babs;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class HealthAdviceAdapter extends ArrayAdapter<HealthAdviceArray>{

    Context context; 
    int layoutResourceId;    
    HealthAdviceArray data[] = null;

    public HealthAdviceAdapter(Context context, int layoutResourceId, HealthAdviceArray[] data) {
        super(context, layoutResourceId, data);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        HealthAdviceArrayHolder holder = null;

        if(row == null)
        {
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new HealthAdviceArrayHolder();
            holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
            holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);

            row.setTag(holder);
        }
        else
        {
            holder = (HealthAdviceArrayHolder)row.getTag();
        }

        HealthAdviceArray weather = data[position];
        holder.txtTitle.setText(weather.title);
        holder.imgIcon.setImageResource(weather.icon);

        return row;
    }

    static class HealthAdviceArrayHolder
    {
        ImageView imgIcon;
        TextView txtTitle;
    }
}

Step 3:

HealthAdviceArray.java

package com.example.babs;


public class HealthAdviceArray {

    public int icon;
    public String title;

    // we are over loading here
    public HealthAdviceArray(){
        super();
    }

    public HealthAdviceArray(int icon, String title) {
        super();
        this.icon = icon;
        this.title = title;
    }

}

step 4: 

Health Advice health_advice.xml

<?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="fill_parent"
    android:background="#FFFFFF"
    android:orientation="vertical" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

step 5:

Health Advice items: health_advice_item_row.xml

<?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="fill_parent"
    android:orientation="horizontal"
    android:padding="10dp" >

    <ImageView
        android:id="@+id/imgIcon"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_marginBottom="5dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="5dp"
        android:contentDescription="@string/image_view"
        android:gravity="center_vertical" />

    <TextView
        android:id="@+id/txtTitle"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="5dp"
        android:gravity="center_vertical"
        android:textColor="#000000"
        android:textSize="22sp"
        android:textStyle="bold" />

</LinearLayout>

Answer 3

在创建自定义适配器时，不要将“Context”对象作为参考传递，只需将Activity对象传递给Custom Adaper。

public class HealthAdvice extends ListFragment {

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

        View rootView = inflater.inflate(R.layout.health_advice, container, false);

        return rootView;

    }

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

        HealthAdviceArray health_data[] = new HealthAdviceArray[]
                {
                new HealthAdviceArray(R.drawable.ic_launcher, "Cloudy"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Showers"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Snow"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Storm"),
                new HealthAdviceArray(R.drawable.ic_launcher, "Sunny")
                };

        HealthAdviceAdapter adapter = new HealthAdviceAdapter(getActivity(), 
                R.layout.health_advice_item_row, health_data);

        /** Setting the array adapter to the list view */
        setListAdapter(adapter);

    }

}// end main class HealthAdvice