问题
MyAndroid
app需要使用来自aArrayList
的数据填充ListView
。
我这样做很麻烦。有人可以帮我提供代码吗?
#1 热门回答(208 赞)
你需要通过anArrayAdapter
来实现它,它将使你的ArrayList(或任何其他集合)适应你的布局中的项目(ListView,Spinner等)。
ListAdapter,用于管理由任意对象数组支持的ListView。默认情况下,此类期望提供的资源ID引用单个TextView。如果要使用更复杂的布局,请使用也带有字段ID的构造函数。该字段id应引用较大布局资源中的TextView。但是引用了TextView,它将填充数组中每个对象的toString()。你可以添加自定义对象的列表或数组。覆盖对象的toString()方法,以确定将为列表中的项显示哪些文本。要使用TextViews之外的其他内容来显示数组,例如ImageViews,或者除了toString()之外还有一些数据填充视图,覆盖getView(int,View,ViewGroup)以返回所需的视图类型。
所以你的代码应该是这样的:
public class YourActivity extends Activity {
private ListView lv;
public void onCreate(Bundle saveInstanceState) {
setContentView(R.layout.your_layout);
lv = (ListView) findViewById(R.id.your_list_view_id);
// Instanciating an array list (you don't need to do this,
// you already have yours).
List<String> your_array_list = new ArrayList<String>();
your_array_list.add("foo");
your_array_list.add("bar");
// This is the array adapter, it takes the context of the activity as a
// first parameter, the type of list view as a second parameter and your
// array as a third parameter.
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
this,
android.R.layout.simple_list_item_1,
your_array_list );
lv.setAdapter(arrayAdapter);
}
}
#2 热门回答(11 赞)
一步一步tutorial
另请查看ArrayAdapter接口:
ArrayAdapter(Context context, int textViewResourceId, List<T> objects)
#3 热门回答(6 赞)
尝试使用以下答案使用ArrayList填充listview
public class ExampleActivity extends Activity
{
ArrayList<String> movies;
public void onCreate(Bundle saveInstanceState)
{
super.onCreate(saveInstanceState);
setContentView(R.layout.list);
// Get the reference of movies
ListView moviesList=(ListView)findViewById(R.id.listview);
movies = new ArrayList<String>();
getMovies();
// Create The Adapter with passing ArrayList as 3rd parameter
ArrayAdapter<String> arrayAdapter =
new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, movies);
// Set The Adapter
moviesList.setAdapter(arrayAdapter);
// register onClickListener to handle click events on each item
moviesList.setOnItemClickListener(new OnItemClickListener()
{
// argument position gives the index of item which is clicked
public void onItemClick(AdapterView<?> arg0, View v,int position, long arg3)
{
String selectedmovie=movies.get(position);
Toast.makeText(getApplicationContext(), "Movie Selected : "+selectedmovie, Toast.LENGTH_LONG).show();
}
});
}
void getmovies()
{
movies.add("X-Men");
movies.add("IRONMAN");
movies.add("SPIDY");
movies.add("NARNIA");
movies.add("LIONKING");
movies.add("AVENGERS");
}
}