如何在選擇ListItem後修改它的背景？

Question

我有一堆ListItem的ListView。當用戶選擇一個項目時，我想將該ListItem的背景更改爲圖像。我怎樣才能做到這一點？

listView.setOnItemClickListener(new OnItemClickListener() { 
    @Override 
    public void onItemClick(AdapterView<?> a, View v, int position, long id) { 
    // how do I change the ListItem background here? 
    } 
}); 

Answer 1

您可以在您的ListView的適配器中設置它。你要做的就是使用你要返回的View上的setBackgroundResource。讓我給你一個簡單的例子：

// lets suppose this is your adapter (which obviously has 
//to be a custom one which extends from on of the main 
//adapters BaseAdapter, CursorAdapter, ArrayAdapter, etc.) 

// every adapter has a getView method that you will have to overwrite 
// I guess you know what I'm talking about 
public View getView(args blah blah){ 
    View theView; 
    // do stuff with the view 

    // before returning, set the background 
    theView.setBackgroundResource(R.drawable.the_custom_background); 

    return theView; 
} 

請注意，我用R.drawable.the_custom_background，這意味着你必須寫一個小XML選擇。別擔心，這比聽起來容易。你res/drawable文件夾中創建名爲the_custom_background.xml的XML文件：再次

<?xml version="1.0" encoding="utf-8"?> 
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
    <item 
     android:state_pressed="true" 
     android:state_enabled="true" 
     android:drawable="@drawable/the_background_color" /> 
</selector> 

注意，我用@drawable/the_background_color，所以最後創建的文件夾res/drawable另一個叫繪製the_background_color：

<?xml version="1.0" encoding="UTF-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android"> 
    <solid android:color="#FF0000" /> 
</shape> 

我知道似乎很雜亂，但這是Android的方式。您也可以嘗試修改setOnItemClickListener中的View，但我認爲這是不理想的，也很難實現。