ListView的CheckBox实现全部选中/不选中
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：
