正文
ListView的CheckBox实现全部选中/不选中
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在Adapter类中定义一个HashMap列表，保存每一行是否被选中：
private static HashMap<Integer, Boolean> isSelected;
可见定义了名为isSelected的HashMap列表，再定义它的getter和setter方法：
public static void setIsSelected(HashMap<Integer, Boolean> isSelected) {
MyAdapter.isSelected = isSelected;
}
public static HashMap<Integer, Boolean> getIsSelected() {
return isSelected;
}
在Adapter类的构造方法中，将isSelected的所有初始值设置为false：
public MyAdapter(Context context, List<String> list){
this.context = context;
this.list = list;
isSelected = new HashMap<Integer, Boolean>();
initData();
}
private void initData() {
for (int i = 0; i < list.size(); i++) {
getIsSelected().put(i, false);
}
}
在getView方法中，定义CheckBox的点击方法，当CheckBox选中/不选中时设置isSelected的值为true/false；同时根据isSelected的值设置CheckBox是否选中，并显示相应的图标：
mCheckbox = (CheckBox)convertView.findViewById(R.id.chkBox);
mCheckbox.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if (isChecked){
buttonView.setButtonDrawable(R.drawable.r02);
isSelected.put(position, true);
}else{
buttonView.setButtonDrawable(R.drawable.r01);
isSelected.put(position, false);
}
}
});
mCheckbox.setChecked(getIsSelected().get(position));
if (getIsSelected().get(position)){
mCheckbox.setButtonDrawable(R.drawable.r02);
}else{
mCheckbox.setButtonDrawable(R.drawable.r01);
}
在主窗体文件中，当点击列表下面的CheckBox时，调用selectAll方法将isSelected的所有值设置为true/false，同时显示相应的图标：
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.chkSelect:
selectAll(chkSelect.isChecked());
break;
case R.id.btnDelete:
break;
default:
break;
} }
private void selectAll(boolean x){
for (int i=0; i<mList.size(); i++){
mAdapter.getIsSelected().put(i, x);
}
if (chkSelect.isChecked()){
chkSelect.setButtonDrawable(R.drawable.r02);
}else{
chkSelect.setButtonDrawable(R.drawable.r01);
}
mAdapter.notifyDataSetChanged();
}
完整的文件如下。
MainActivity.java：
package com.hzhi.mylistview; import android.support.v7.app.ActionBarActivity; import java.util.ArrayList;
import java.util.List; import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView; public class MainActivity extends ActionBarActivity implements OnClickListener{ private CheckBox chkSelect;
private Button btnDelete;
private List<String> mList;
private MyAdapter mAdapter;
private ListView mListview; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); initView();
initData();
mAdapter = new MyAdapter(MainActivity.this, mList);
mListview.setAdapter(mAdapter);
} private void initView(){
chkSelect = (CheckBox) findViewById(R.id.chkSelect);
btnDelete = (Button) findViewById(R.id.btnDelete);
mListview = (ListView) findViewById(R.id.lstView); chkSelect.setOnClickListener(this);
btnDelete.setOnClickListener(this); chkSelect.setButtonDrawable(R.drawable.r01);
} private void initData(){
mList = new ArrayList<String>();
for (int i=0; i<10; i++){
mList.add("第" + String.valueOf(i) + "条数据");
}
} private void selectAll(boolean x){
for (int i=0; i<mList.size(); i++){
mAdapter.getIsSelected().put(i, x);
}
if (chkSelect.isChecked()){
chkSelect.setButtonDrawable(R.drawable.r02);
}else{
chkSelect.setButtonDrawable(R.drawable.r01);
}
mAdapter.notifyDataSetChanged();
} @Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.chkSelect:
selectAll(chkSelect.isChecked());
break;
case R.id.btnDelete:
break;
default:
break;
} } }
MyAdapter.java：
package com.hzhi.mylistview; import java.util.HashMap;
import java.util.List; import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.CompoundButton.OnCheckedChangeListener; public class MyAdapter extends BaseAdapter{ List<String> list;
Context context;
private static HashMap<Integer, Boolean> isSelected; public MyAdapter(Context context, List<String> list){
this.context = context;
this.list = list;
isSelected = new HashMap<Integer, Boolean>();
initData();
} private void initData() {
for (int i = 0; i < list.size(); i++) {
getIsSelected().put(i, false);
}
} @Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
} @Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
} @Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
} @Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
CheckBox mCheckbox;
TextView mText; if(convertView == null){
convertView = LayoutInflater.from(context).inflate(R.layout.listitem, null);
}
mCheckbox = (CheckBox)convertView.findViewById(R.id.chkBox);
mCheckbox.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if (isChecked){
buttonView.setButtonDrawable(R.drawable.r02);
isSelected.put(position, true);
}else{
buttonView.setButtonDrawable(R.drawable.r01);
isSelected.put(position, false);
}
}
});
mCheckbox.setChecked(getIsSelected().get(position));
if (getIsSelected().get(position)){
mCheckbox.setButtonDrawable(R.drawable.r02);
}else{
mCheckbox.setButtonDrawable(R.drawable.r01);
} mText = (TextView)convertView.findViewById(R.id.txtText);
mText.setText(list.get(position).toString()); return convertView;
} public static void setIsSelected(HashMap<Integer, Boolean> isSelected) {
MyAdapter.isSelected = isSelected;
} public static HashMap<Integer, Boolean> getIsSelected() {
return isSelected;
} }
运行效果如下：
选中最下面的CheckBox后，实现全部选中：
