在android中使用图标，标题和描述列表视图

Question

它在getBaseContext（）的代码行中显示错误。我不知道什么heppen在这里，我试图代替笑着转接器阵列适配器，但它显示错误.right现在即时通讯与简单的适配器..它给我的错误做..

SimpleAdapter(getBaseContext(), aList, R.layout.list,   
     from, to); 

headFragment.java

public class HeadFragment extends ListFragment { 
OnHeadlineSelectedListener mCallback; 

// The container Activity must implement this interface so the fragment can deliver 
    messages 
public interface OnHeadlineSelectedListener { 
    /** Called by HeadlinesFragment when a list item is selected */ 
    public void onArticleSelected(int position); 
} 
static String[] Headlines = { 
    "Article One", 
    "Article Two", 
    "Article 3" 
}; 
int[] flags = new int[]{ 
     R.drawable.ic_11, 
     R.drawable.ic_12, 
     R.drawable.ic_13 

    }; 
String[] currency = new String[]{ 
     "Indian Rupee", 
     "Pakistani Rupee", 
     "Sri Lankan Rupee", 

    }; 

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


// Each row in the list stores country name, currency and flag 
    List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();   

    for(int i=0;i<10;i++){ 
     HashMap<String, String> hm = new HashMap<String,String>(); 
     hm.put("txt", "Headlines: " + Headlines[i]); 
     hm.put("cur","Currency : " + currency[i]); 
     hm.put("flag", Integer.toString(flags[i]));    
     aList.add(hm);   
    } 

    // Keys used in Hashmap 
    String[] from = { "flag","txt","cur" }; 

    // Ids of views in listview_layout 
    int[] to = { R.id.flag,R.id.txt,R.id.cur};   

    // Instantiating an adapter to store each items 

    SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList, R.layout.list,   
     from, to); 
    // Getting a reference to listview of main.xml lagetBayout file 
    ListView listView =(ListView) findViewById(R.id.listview); 

    // Setting the adapter to the listView 
    listView.setAdapter(adapter);  } 

list.xml 在这里输入的代码

 <?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="match_parent" 
android:orientation="horizontal" 
> 
<ImageView 
    android:id="@+id/flag" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 

    android:paddingTop="10dp" 
    android:paddingRight="10dp" 
    android:paddingBottom="10dp" 
/> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
> 
    <TextView 
     android:id="@+id/txt" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textSize="15dp" 
    /> 

    <TextView 
     android:id="@+id/cur" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textSize="10dp" 
    /> 
    <!-- Rightend Arrow --> 
<ImageView android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:src="@drawable/next" 
    android:layout_alignParentRight="true" 
    android:layout_centerVertical="true"/> 

</LinearLayout> 
    </LinearLayout> 

Answer 1

insted的的getBaseContext()使用getActivity()或getApplicationContext()

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getApplicationContext()应用上下文与应用程序了关联，并且将永远是整个生命周期相同

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getBasecontext()不应该使用jst使用上下文而不是它与活动相关联，并可能是dest royed当活动中的片段被破坏

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getActivity()返回片段与相关联的活动的情况下。

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Answer 2

使用getApplicationContext()或Frgment context ..

Answer 3

@Abhay没有错，你的代码只需使用getApplicationContext（）的代替getBaseContext（），我完全同意@DhavalSodhaParmar

要知道更多阅读之间的区别getBaseContext（）和getApplicationContext（）