带checkBox的ListView

最新推荐文章于 2025-08-14 10:16:47 发布

izard999

最新推荐文章于 2025-08-14 10:16:47 发布

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分类专栏： android 文章标签： listview android layout object encoding class

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本文探讨了在Android应用中使用ListView与CheckBox进行多选操作时遇到的常见问题，通过创建自定义适配器和重写关键方法，实现了正确的多选逻辑，避免了多选或少选的错误。

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无意中在网上看到了ListView带CheckBox会出现多选或者少选的问题, 于是自己写了个demo研究下!

其中我屏蔽了checkBox的点击和焦点, 改变checkBox的状态由点击ListView的item来完成!

main.xml

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

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content">
  <TextView 
  	android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:id="@+id/tv"
  />
  
  <CheckBox 
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="right"
  android:focusable="false"
  android:clickable="false"
  android:id="@+id/checkBox"
  />
  
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ListView listView = (ListView)findViewById(R.id.listView);
        final List<Map<String, Object>> data = new ArrayList<Map<String,Object>>();
        for(int i = 1; i <= 100; i++) {
        	Map<String, Object> item = new HashMap<String, Object>();
        	item.put("name", "name:" + i);
        	item.put("check", i % 2 == 0);
        	data.add(item);
        }
        final SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.list_item,
        		new String[]{"name", "check"}, new int[]{R.id.tv, R.id.checkBox});
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,
					long id) {
				CheckBox ck = (CheckBox)view.findViewById(R.id.checkBox);
				Log.e("MainActivity", String.valueOf(ck.isChecked()));
				//ck.setChecked(!ck.isChecked());
				SimpleAdapter sa = (SimpleAdapter)parent.getAdapter();
				((Map<String, Object>)sa.getItem(position)).put("check", !ck.isChecked());
				sa.notifyDataSetChanged();
			}
        });
    }
}

运行, 没有出现重复选和错位的问题啊, 不知道是不是android修复了这个问题!

网上很多人有遇到错位的问题, 那么就需要重写Adapter的getView, 自己定义一个ViewHandler, 里面包含list_item中的控件

private final class ViewHandler {

    TextView tv;

    CheckBox ck;

}

重写Adapter的getView

public View getView(int position, View convertView,
        			ViewGroup parent) {
        		ViewHolder holder;
        		if(convertView == null) {
        			holder = new ViewHolder();
        			convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.list_item, null);
        			holder.nameText = (TextView)convertView.findViewById(R.id.tv);
        			holder.ck = (CheckBox)convertView.findViewById(R.id.checkBox);
        			convertView.setTag(holder);
        		} else {
        			holder = (ViewHolder)convertView.getTag();
        		}
        		Log.d("MainActivity", String.valueOf(data.get(position).get("check")));
        		holder.ck.setChecked((Boolean)data.get(position).get("check"));
        		
        		
        		return super.getView(position, convertView, parent);
        	}