listview 的 selection mode 训练小例子

 例子实现效果如图

 

代码如下：

 

package com.example.listviewselectmode;


import android.R.integer;
import android.os.Bundle;
import android.app.ListActivity;
import android.app.ListActivity;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AbsListView.MultiChoiceModeListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ListActivity {

    String[] itemsStrings={"a","b","c","d","e"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        ListView listView=getListView();
        //注意此处没有setContentView那一项
        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
        listView.setMultiChoiceModeListener(new ModeChoice());
        //注意该adapter的第二个参数为android.R.layout.simple_list_item_checked
        ArrayAdapter adapter=new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_checked, itemsStrings);
        setListAdapter(adapter);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        getActionBar().setTitle("long press to select");
        super.onPostCreate(savedInstanceState);

    }

    class ModeChoice implements MultiChoiceModeListener{

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            // TODO Auto-generated method stub
            int count=getListView().getCheckedItemCount();
            switch (item.getItemId()) {
            case R.id.share:
                Toast.makeText(getApplicationContext(), "you share "+count+"项", 1000).show();
                break;
            default:
                  Toast.makeText(MainActivity.this, "Clicked " + item.getTitle(),
                            Toast.LENGTH_SHORT).show();
                break;
            }

            return true;
        }

        private void setSubtitle(ActionMode mode) {
            // TODO Auto-generated method stub
            int count=getListView().getCheckedItemCount();
            switch (count) {
            case 0:
                mode.setSubtitle("");
                break;
            case 1:
                mode.setSubtitle("you select one item");
                break;
            default:
                mode.setSubtitle("you select"+count+"items");
                break;
            }
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            // TODO Auto-generated method stub
            getMenuInflater().inflate(R.menu.main, menu);
            mode.setSubtitle("select item");
            setSubtitle(mode);
            //此处需注意需要返回true
            return true;
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            // TODO Auto-generated method stub

        }

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            // TODO Auto-generated method stub

            return false;
        }

        @Override
        public void onItemCheckedStateChanged(ActionMode mode, int position,
                long id, boolean checked) {
            // TODO Auto-generated method stub
            setSubtitle(mode);
        }


    }

}