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Android在listview添加checkbox实现
来源:互联网   发布日期:2015-11-26 16:23:38   浏览:1645次  

导读:主界面CheckBoxinListViewActivity.java代码如下:[java] 瀀甀戀氀椀挀 class CheckBoxinListViewActivity extend...

主界面CheckBoxinListViewActivity.java代码如下:

[java]

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:

[java]

public class Message {

public boolean isCheck;

public String str;

public Message(String str){

this.str = str;

}

}

main.xml代码如下:

[html]

<?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:

[html]

<?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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