Android MultiChoiceModeListener 支持 2.3

Question

为了支持操作栏，我使用 Android 支持库包 V4 和 V7。我在我的应用程序中使用 MultiChoiceModeListener。我如何为 2.3 设备使用 MultiChoiceModeListener..

Answer 1

工作示例 V7

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.view.ActionMode;
import android.util.SparseBooleanArray;

import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView; 
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends ActionBarActivity {

    static final String[] COUNTRIES = new String[] {
        "Afghanistan", "Albania", "Algeria", "American Samoa", "Andorra",
        "Angola", "Anguilla", "Canada", "France", "Spain" };

    private ListView mListView;
    private ActionMode mMode;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);




        mMode = null;
        mListView = (ListView) findViewById(R.id.listView1);
        mListView.setAdapter(new ArrayAdapter(this,
                android.R.layout.simple_list_item_multiple_choice, COUNTRIES));
        mListView.setItemsCanFocus(false);
        mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        mListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                // TODO Auto-generated method stub
                 SparseBooleanArray checked = mListView.getCheckedItemPositions();
                    boolean hasCheckedElement = false;
                    for (int i = 0 ; i < checked.size() && ! hasCheckedElement ; i++) {
                        hasCheckedElement = checked.valueAt(i);
                    }

                    if (hasCheckedElement) {
                        if (mMode == null) {
                            mMode =  startSupportActionMode(new ModeCallback());
                        }
                    } else {
                        if (mMode != null) {
                            mMode.finish();
                        }
                    }


            }
        });

    }





    private final class ModeCallback implements ActionMode.Callback {

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            // Create the menu from the xml file
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.activity_main, menu);
            return true;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            // Here, you can checked selected items to adapt available actions
            return false;
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            // Destroying action mode, let's unselect all items
            for (int i = 0; i < mListView.getAdapter().getCount(); i++)
                mListView.setItemChecked(i, false);

            if (mode == mMode) {
                mMode = null;
            }
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            long[] selected = mListView.getCheckedItemIds();
            if (selected.length > 0) {
                for (long id: selected) {
                    // Do something with the selected item
                }
            }
            mode.finish();
            return true;
        }
    };
}