将图像修复为列表活动的背景

时间:2011-07-03 13:33:47

标签: android

你好我在listview后面调用了一个图像,listview是透明的。列表中的每条记录都出现在重复图像上。我怎么能修复这个重复的图像。这是xml文件

<?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:padding="7dp"
    android:background="@drawable/ac"
    android:cacheColorHint="#00000000"


    >
<TextView  

    android:id="@+id/item_title"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:padding="2dp"
    android:textSize="20dp" />
    <TextView  
    android:id="@+id/item_subtitle"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="2dp"
    android:textSize="18dp" />
</LinearLayout>

由于

现在我已经更新了这样的xml文件 主xml文件

<?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:background="@drawable/ac"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 

    />

    <ListView android:id="@+id/listView" 
    android:background="@drawable/ac"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />


</LinearLayout>

列出xml文件

<?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:cacheColorHint="#00000000"




    >
<TextView  

    android:id="@+id/item_title"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:padding="2dp"
    android:textSize="20dp" />
    <TextView  
    android:id="@+id/item_subtitle"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="2dp"
    android:textSize="18dp" />
</LinearLayout>

以及以这种方式调用的活动

{ R.id.item_title, R.id.item_subtitle }

整个代码看起来像

public class Test extends ListActivity  {
      Prefs myprefs = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listplaceholder);
        this.myprefs = new Prefs(getApplicationContext());
        // install handler for processing gui update messages
        ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
       JSONObject json = JSONfunctions.getJSONfromURL("...............");

        try{

            JSONArray  earthquakes = json.getJSONArray("services");

            for(int i=0;i<earthquakes.length();i++){                        
                HashMap<String, String> map = new HashMap<String, String>();    
                JSONObject e = earthquakes.getJSONObject(i);

                map.put("id", e.getString("taskid"));
                map.put("pic", "Service name : " + e.getString("employeepic"));
                map.put("serviceinfo", "" +  e.getString("employeename")+ " : "+ e.getString("starttime")
                        +" To " +  e.getString("endtime"));
                mylist.add(map);            
            }       
        }catch(JSONException e)        {
             Log.e("log_tag", "Error parsing data "+e.toString());
        }

        ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.test, 
                        new String[] { "servicename", "serviceinfo" }, 
                        new int[] { R.id.item_title, R.id.item_subtitle });

        setListAdapter(adapter);

        final ListView lv = getListView();
        lv.setTextFilterEnabled(true);  
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {              
                @SuppressWarnings("unchecked")
                HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);                   
                Toast.makeText(Test.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_SHORT).show(); 

            }
        });

    }

1 个答案:

答案 0 :(得分:2)

我想您正在使用上面的XML来填充列表视图中的项目(即)getView()内部...

1.从上面的XML中删除android:background="@drawable/ac" 2.将其添加到ListView的XML说明,

<ListView android:id="@+id/listView" 
    android:background="@drawable/ac"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />

<强>解释

设置用于填充列表的布局的背景将生成'重复图像',因为您要为子项设置背景(即)listView的项目而不是列表。< / p>

修改
1.对于您的Activity,您将从布局文件(例如main.xml)加载ListView,在ListView的布局文件中添加背景。

2.从上面的代码中删除LinearLayout中的背景。

再次编辑:


使用以下XML,
main.xml中

<?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:background="@drawable/ac"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"/>

    <ListView android:id="@+id/listView" 
    android:background="#00000000"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />

</LinearLayout>


列出xml文件

<?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:cacheColorHint="#00000000"
    android:background="#00000000"
    >
<TextView  

    android:id="@+id/item_title"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:padding="2dp"
    android:textSize="20dp" />
    <TextView  
    android:id="@+id/item_subtitle"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="2dp"
    android:textSize="18dp" />
</LinearLayout>