从按钮突出显示列表视图中的项目

时间:2013-09-06 07:52:24

标签: android android-listview

我无法做最简单的事情:-)(我想它应该很简单)

单击按钮时,我尝试在列表视图中突出显示项目。我点击没有任何反应: - (

有没有人看到,我对下面的代码做错了什么,或者有人有提示吗?

启动活动时,会显示列表视图,并突出显示第三项(int isymbolindex = 2;)。但是当尝试更改onClick或onItemClick中的选择时,它不会wotk。调试它时,它通过'public View getView'方法并且isymbolindex = 3,但是gui(listview)没有更新。

    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;

    import android.os.Bundle;
    import android.app.Activity;
    import android.app.ExpandableListActivity;
    import android.content.Context;
    import android.view.Menu;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.ViewGroup;
    import android.webkit.WebView;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.BaseAdapter;
    import android.widget.Button;
    import android.widget.ExpandableListView;
    import android.widget.ListView;
    import android.widget.TextView;
    import android.widget.Toast;

    public class CityEditorActivity extends Activity {

    int isymbolindex=2;     
    Context croot=this;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_city_editor);
        final ListView lvsymbols= (ListView)findViewById(R.id.listViewdymbols);


        String[] values = new String[] { "Value1", "Value2", "Value3", "Value4"};

        final ArrayList<String> list = new ArrayList<String>();
        for (int i = 0; i < values.length; ++i) {
          list.add(values[i]);
        }

        lvsymbols.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        lvsymbols.setSelector(android.R.color.darker_gray);


        Button bvon1=(Button)findViewById(R.id.vonadd1); 
        bvon1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                isymbolindex=3;
                lvsymbols.setSelection(3);
                lvsymbols.invalidate();
            }
        });




        lvsymbols.setAdapter(   new ArrayAdapter(this, R.layout.own_simple_list_item, list)
        {

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                final View renderer = super.getView(position, convertView, parent);
                if (position == isymbolindex)
                {
                    //TODO: set the proper selection color here:
                    renderer.setBackgroundResource(android.R.color.darker_gray);
                }else{
                    renderer.setBackgroundResource(android.R.color.white);
                }
                return renderer;
            }

        });

        lvsymbols.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View view, int position,
                    long arg3) {
                isymbolindex=position;
                arg0.setSelection(isymbolindex);

                view.getFocusables(position);
                view.setSelected(true);
                lvsymbols.invalidate();
            }
        });


    }


}

2 个答案:

答案 0 :(得分:1)

您可以在致电requestFocusFromTouch()方法

之前尝试setSelection()

也许

ListView.setItemChecked(int position, boolean checked);

答案 1 :(得分:0)

你也可以尝试这个

在您拥有列表视图的主布局上添加此

android:background="?android:attr/activatedBackgroundIndicator"

创建选择器

<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_focused="true">
<shape>
    <solid android:color="#ffffff" />
</shape>

                       

活动

listView.setSelector(R.drawable.listview_item_selection_effect);
listView.setItemChecked(3, true);


onClick of button call this setItemChecked and pass the postion of the item