Android在listview添加checkbox实现
16lz
2021-01-23
主界面CheckBoxinListViewActivity.java代码如下：
public class CheckBoxinListViewActivity extends Activity { /** Called when the activity is first created. */ private MyAdapter adapter; private ListView listview; private Button checkAll; private Button noCheckAll; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); listview = (ListView)findViewById(R.id.listview); checkAll = (Button)findViewById(R.id.button1); noCheckAll = (Button)findViewById(R.id.button2); adapter = new MyAdapter(); listview.setAdapter(adapter); checkAll.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { adapter.checkAll(); } }); noCheckAll.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { adapter.noCheckAll(); } }); } private class MyAdapter extends BaseAdapter{ private ArrayList<Message> list= new ArrayList<Message>(); public MyAdapter(){ for(int i = 1 ;i<=100 ; i++){ list.add(new Message("item_"+i)); } } public void checkAll(){ for(Message msg:list){ msg.isCheck = true; } notifyDataSetChanged(); } public void noCheckAll(){ for(Message msg:list){ msg.isCheck = false; } notifyDataSetChanged(); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder viewHolder; if(convertView == null){ LayoutInflater inflater = LayoutInflater.from(CheckBoxinListViewActivity.this); convertView = inflater.inflate(R.layout.listview_item, null); viewHolder = new ViewHolder(); viewHolder.checkBox = (CheckBox)convertView.findViewById(R.id.checkBox1); convertView.setTag(viewHolder); }else{ viewHolder = (ViewHolder)convertView.getTag(); } final Message msg = list.get(position); viewHolder.checkBox.setText(msg.str); viewHolder.checkBox.setChecked(msg.isCheck); //注意这里设置的不是onCheckedChangListener，还是值得思考一下的 viewHolder.checkBox.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if(msg.isCheck){ msg.isCheck = false; }else{ msg.isCheck = true; } } }); return convertView; } } private class ViewHolder{ CheckBox checkBox; } } 适配器所适配的消息Message.java如下：
public class Message { public boolean isCheck; public String str; public Message(String str){ this.str = str; } } main.xml代码如下：
<?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"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content"> <Button android:text="全选" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:text="撤消" android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout> <ListView android:id="@+id/listview" android:layout_height="fill_parent" android:layout_width="fill_parent" /> </LinearLayout>
listview_item.xml代码如下：
<?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" android:descendantFocusability="blocksDescendants" ><LinearLayout android:layout_width="fill_parent"android:layout_height="wrap_content"android:gravity="center"><CheckBox android:text="CheckBox" android:id="@+id/checkBox1" android:layout_width="wrap_content" android:layout_height="wrap_content"/></LinearLayout></LinearLayout>
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