Android控件之ListView探究二，带CheckBox的ListView

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mb63e0703549da8 2023-02-15 17:09:46 博主文章分类：android基础知识 ©著作权

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布局用的是RelativeLayout这种布局方式，要指定位置，不太好，以后如果有其它好的方式再修改

main.xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="horizontal" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <ListView android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:id="@+id/MyListView">
  </ListView>
</LinearLayout>

list_items.xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="wrap_content" android:id="@+id/myListItem"
  android:paddingBottom="5dip" android:paddingLeft="12dip"
  android:paddingRight="12dip">
  <ImageView android:id="@+id/img" android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:layout_alignParentLeft="true"></ImageView>
  <TextView android:layout_height="wrap_content"
    android:layout_width="wrap_content" android:id="@+id/itemTitle"
    android:textSize="20dip" android:paddingTop="15px"
    android:layout_marginLeft="70px">
  </TextView>
  <CheckBox android:id="@+id/cb" android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:layout_alignParentRight="true"
    android:focusable="false"></CheckBox>
</RelativeLayout>

MyList.java类:

package iaiai.test;

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

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

public class MyList extends Activity {

  private ListView list;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    list = (ListView) findViewById(R.id.MyListView);

    // 配置适配器
    MyCheckBoxAdapter adapter = new MyCheckBoxAdapter(this,getData()); // 布局里的控件id
    // 添加并且显示
    list.setAdapter(adapter);

    // 添加点击
    list.setOnItemClickListener(new OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
          long arg3) {
        setTitle("点击第" + arg2 + "个项目");
        Toast.makeText(MyList.this, "点击第" + arg2 + "个项目",
            Toast.LENGTH_LONG).show();
      }
    });

    // 添加长按点击
    list.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
      @Override
      public void onCreateContextMenu(ContextMenu menu, View v,
          ContextMenuInfo menuInfo) {
        // menu.setHeaderIcon(R.drawable.icon); //字义图片样式
        menu.setHeaderTitle("长按菜单选项:");
        menu.add(1, 0, 0, "编辑");
        menu.add(0, 1, 0, "删除");
      }
    });
  }

  @Override
  public boolean onContextItemSelected(MenuItem item) {
    int selectedPosition = ((AdapterContextMenuInfo) item.getMenuInfo()).position; // 刚才选择的
    Map<String, String> map = (HashMap) list
        .getItemAtPosition(selectedPosition); // ListView中的数据
    Toast.makeText(MyList.this,
        "你选择的:" + selectedPosition + "，内容为:" + map.get("itemTitle"),
        Toast.LENGTH_LONG).show(); // 显示那条数据

    String temp = "";
    switch (item.getItemId()) {
    case 0:
      temp = "编辑";
      break;
    case 1:
      temp = "删除";
      break;
    default:
      break;
    }
    // Toast.makeText(this, temp + "處理", Toast.LENGTH_LONG).show();
    return super.onContextItemSelected(item);
  }

  private List<Map<String, String>> getData() {
    // 组织数据源
    List<Map<String, String>> mylist = new ArrayList<Map<String, String>>();
    for (int i = 0; i < 10; i++) {
      Map<String, String> map = new HashMap<String, String>();
      map.put("" + i, i + "");
      map.put("itemTitle", "文章" + i);
      mylist.add(map);
    }
    return mylist;
  }

  /**
   * listview中点击按键弹出对话框
   */
  public void showInfo() {
    new AlertDialog.Builder(this).setTitle("我的listview")
        .setMessage("介绍...")
        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
          }
        }).show();
  }
}

MyCheckBoxAdapter.java类:

package iaiai.test;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MyCheckBoxAdapter extends BaseAdapter {

  private LayoutInflater mInflater;

  private List<Map<String, String>> listData;

  private Map<Integer, Map<String, String>> selectMap = new HashMap<Integer, Map<String, String>>();

  private class ViewHolder {
    public ImageView img;
    public TextView title;
    public CheckBox checkBox;
  }

  public MyCheckBoxAdapter(Context context, List<Map<String, String>> listData) {
    this.mInflater = LayoutInflater.from(context);
    this.listData = listData;
  }

  @Override
  public int getCount() {
    return listData.size();
  }

  @Override
  public Object getItem(int position) {
    return listData.get(position);
  }

  @Override
  public long getItemId(int position) {
    return position;
  }

  @Override
  public View getView(final int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;
    if (convertView == null) {
      holder = new ViewHolder();
      convertView = mInflater.inflate(R.layout.list_items, null);
      final View view = convertView;
      holder.img = (ImageView) convertView.findViewById(R.id.img);
      holder.title = (TextView) convertView.findViewById(R.id.itemTitle);
      holder.checkBox = (CheckBox) convertView.findViewById(R.id.cb);
      holder.checkBox.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
          if (selectMap.get(position) != null) {
            selectMap.remove(position);
          } else {
            selectMap.put(position, listData.get(position));
          }
          Toast.makeText(view.getContext(),
              "你选择了:" + selectMap.size() + "个.",
              Toast.LENGTH_LONG).show();
        }
      });
      convertView.setTag(holder);
    } else {
      holder = (ViewHolder) convertView.getTag();
    }

    holder.img.setBackgroundResource(R.drawable.icon);
    holder.title.setText(listData.get(position).get("itemTitle"));

    if (selectMap.get(position) != null) {
      holder.checkBox.setChecked(true);
    } else {
      holder.checkBox.setChecked(false);
    }

    return convertView;
  }
}