选择ListView项目，并通过单击按钮自动单击

Question

我想知道如何选择listview first item select并通过单击按钮自动单击。

使用下面的代码，我可以选择第一行，但无法选择。

lv1.setItemChecked(0, true);

这是我的listview点击事件：

final ListView lv1 = (ListView) findViewById(R.id.list);

// Pass results to ListViewAdapter Class
adapter = new ItemListBaseAdapter(this, somedata);
// Binds the Adapter to the ListView
lv1.setAdapter(adapter);
lv1.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 

lv1.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> a, View v, int position, long id) {
        //btnNxt.setEnabled(true);
        Intent i = new Intent(getApplicationContext(), FirstActivity.class);
        // Pass all data 
        i.putExtra("mydata", somedata);
        // Pass a single position
        i.putExtra("position", position);
        // Open SingleItemView.java Activity
        startActivity(i);
    }
});

非常感谢您的帮助！如果有人想了解更多信息，请务必告诉我，以便我更新我的问题。

Answer 1

在初始化适配器之前，通过将setChoiceMode设置为listview来尝试它。

lv1.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 

adapter = new ItemListBaseAdapter(this, somedata);

lv1.setAdapter(adapter);

Answer 2

换成

 lv1.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

使用SparseBooleanArray获取选中的项目

例子：

查看第一行myList。setItemChecked（0，true）。

 public class MainActivity extends Activity {

    ListView myList;
    Button getChoice;
    String[] listContent = {"January","February","March","April","May","June", "July","August","September","October","November","December" };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myList = (ListView)findViewById(R.id.listView1);
        getChoice = (Button)findViewById(R.id.button1);
        ArrayAdapter<String> adapter= new ArrayAdapter<String>(this,android.R.layout.simple_list_item_multiple_choice,listContent);
        myList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        myList.setAdapter(adapter);
        getChoice.setOnClickListener(new Button.OnClickListener(){
         @Override
         public void onClick(View v) {
                String selected = "";
                int cntChoice = myList.getCount();
                SparseBooleanArray sparseBooleanArray = myList.getCheckedItemPositions();
                for(int i = 0; i < cntChoice; i++){
                    if(sparseBooleanArray.get(i)) {
                        selected += myList.getItemAtPosition(i).toString() + "\n";

                    }
                }

                Toast.makeText(MainActivity.this, selected,  Toast.LENGTH_LONG).show();

            }});
    }

}

主要活动。xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
         >

    </ListView>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="Button" />

</RelativeLayout>

断裂

Answer 3

选择项目与单击项目不同。如果您想对某个项目的选择做出反应，请使用setOnItemSelectedListener，但如果您想对用户单击某个项目做出反应，请使用setOnItemClickListener。