我正在申请，但现在我遇到了问题。无论我关闭应用程序还是按下设备上的后退按钮，我都希望复选框保持选中状态。这是我的代码
package com.example.vreaucarnet;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
public class ActeA extends MainActivity2A {
private ListView mainListView;
private mItems[] itemss;
private ArrayAdapter<mItems> listAdapter;
ArrayList<String> checked = new ArrayList<String>();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.acte2a);
// Find the ListView resource.
mainListView = (ListView) findViewById(R.id.mainListView);
// When item is tapped, toggle checked properties of CheckBox and
// Planet.
mainListView
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View item,
int position, long id) {
mItems planet = listAdapter.getItem(position);
planet.toggleChecked();
SelectViewHolder viewHolder = (SelectViewHolder) item
.getTag();
viewHolder.getCheckBox().setChecked(planet.isChecked());
}
});
// Create and populate planets.
itemss = (mItems[]) getLastNonConfigurationInstance();
ArrayList<mItems> planetList = new ArrayList<mItems>();
planetList.add(new mItems("DJ-Android"));
planetList.add(new mItems("Android"));
planetList.add(new mItems("iPhone"));
planetList.add(new mItems("BlackBerry"));
planetList.add(new mItems("Java"));
planetList.add(new mItems("PHP"));
planetList.add(new mItems(".Net"));
// Set our custom array adapter as the ListView's adapter.
listAdapter = new SelectArralAdapter(this, planetList);
mainListView.setAdapter(listAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.add(0, 1, Menu.NONE, "Products");
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case 1:
for (int i = 0; i < checked.size(); i++) {
Log.d("pos : ", "" + checked.get(i));
}
break;
}
return super.onOptionsItemSelected(item);
}
/** Holds planet data. */
private static class mItems {
private String name = "";
private boolean checked = false;
public mItems() {
}
public mItems(String name) {
this.name = name;
}
public mItems(String name, boolean checked) {
this.name = name;
this.checked = checked;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isChecked() {
return checked;
}
public void setChecked(boolean checked) {
this.checked = checked;
}
public String toString() {
return name;
}
public void toggleChecked() {
checked = !checked;
}
}
/** Holds child views for one row. */
private static class SelectViewHolder {
private CheckBox checkBox;
private TextView textView;
public SelectViewHolder() {
}
public SelectViewHolder(TextView textView, CheckBox checkBox) {
this.checkBox = checkBox;
this.textView = textView;
}
public CheckBox getCheckBox() {
return checkBox;
}
public void setCheckBox(CheckBox checkBox) {
this.checkBox = checkBox;
}
public TextView getTextView() {
return textView;
}
public void setTextView(TextView textView) {
this.textView = textView;
}
}
/** Custom adapter for displaying an array of Planet objects. */
private static class SelectArralAdapter extends ArrayAdapter<mItems> {
private LayoutInflater inflater;
public SelectArralAdapter(Context context, List<mItems> planetList) {
super(context, R.layout.simplerow, R.id.rowTextView, planetList);
// Cache the LayoutInflate to avoid asking for a new one each time.
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Planet to display
mItems planet = (mItems) this.getItem(position);
// The child views in each row.
CheckBox checkBox;
TextView textView;
// Create a new row view
if (convertView == null) {
convertView = inflater.inflate(R.layout.simplerow, null);
// Find the child views.
textView = (TextView) convertView
.findViewById(R.id.rowTextView);
checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);
// Optimization: Tag the row with it's child views, so we don't
// have to
// call findViewById() later when we reuse the row.
convertView.setTag(new SelectViewHolder(textView, checkBox));
// If CheckBox is toggled, update the planet it is tagged with.
checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
mItems planet = (mItems) cb.getTag();
planet.setChecked(cb.isChecked());
}
});
}
// Reuse existing row view
else {
// Because we use a ViewHolder, we avoid having to call
// findViewById().
SelectViewHolder viewHolder = (SelectViewHolder) convertView
.getTag();
checkBox = viewHolder.getCheckBox();
textView = viewHolder.getTextView();
}
// Tag the CheckBox with the Planet it is displaying, so that we can
// access the planet in onClick() when the CheckBox is toggled.
checkBox.setTag(planet);
// Display planet data
checkBox.setChecked(planet.isChecked());
textView.setText(planet.getName());
return convertView;
}
}
public Object onRetainNonConfigurationInstance() {
return itemss;
}
}