Question

我创建了两个简单的列表视图。在第一个列表视图中，我将category作为项目名称。这是我列入清单一的唯一项目。在列表视图中我放了很多项目，例如橙色，苹果，芒果，香蕉等。我想知道的是，如果用户在第二个列表视图中选择一个特定项目，我希望所选项目是在第一个列表视图中显示。因此，很容易识别用户先前选择的项目。请帮帮我....

这是我的第一个列表视图代码：

public class bview extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setListAdapter(new ArrayAdapter(this,
            android.R.layout.simple_list_item_1, cat));
        getListView().setTextFilterEnabled(true);
    }

    static final String[] cat = new String[] {
        "Category", };
protected void onListItemClick(ListView parent, View v, int position,
                                                                        long id) {          

            Intent intent= new Intent(bview.this,listview.class);
            startActivity(intent);
            //intent.putExtra("value", value);                    

        }}

第二个listview代码：

    public class listview extends Activity
{    


    @Override    
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.submain);


        ListView mlistView = (ListView) findViewById(R.id.listview);
        mlistView.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, 
                new String[] {"orange", "apple","mango","banana","grapes"}));

 mlistView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){
     public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,long arg3){
         Intent in2 =new Intent(listview.this, bview.class);
         startActivity(in2);
     }
public void onNothingSelected(AdapterView<?>arg0){
 }});

}}

我使用了onitemselected但是如果点击橙色则不会发生任何事情。在我的代码中我应该出错...

Answer 1

在第二个列表视图中，使用setOnItemSelectedListener。当用户单击其中一个项目时，将其添加到支持第一个ListView的数据结构中。所以你在第二次活动中在onCreate中做了类似的事情：

protected void onCreate(Bundle icicle){
  //setup your listview here
  myListview.setOnItemSelectedListener(new AdpaterView.OnItemSelectedListener(){
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
      //add particular item that was clicked to the backing datastructure 
      // of your listview in the first activity here
    }

    public void onNothingSelected(AdapterView<?> parent){
      //don't do anything here
    }
  });
  //any other stuff in your onCreate
}

Answer 2

在第二个ListView的OnItemClick中，您可以设置第一个ListView的选定项目，请参阅Android - setSelected in OnItemClick in ListView

如何将列表视图中选择的项绑定到另一个列表？

2 个答案: