如何在下次打开应用时使用共享偏好设置来存储我的复选框的状态？我正在使用自定义适配器，所以我猜它必须放在那里，但我不太确定。
我的适配器：
public class MobileArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final String[] values;
private ArrayList<Boolean> itemChecked = new ArrayList<Boolean>();
public MobileArrayAdapter(Context context, String[] values) {
super(context, R.layout.list_adapter, values);
this.context = context;
this.values = values;
for (int i = 0; i < this.getCount(); i++) {
itemChecked.add(i, false);
}
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflater.inflate(R.layout.list_adapter,
parent, false);
}
// in your code you search for the CheckBox with the id checkBox1 2 times so I assumed that you are referring to the same view.
CheckBox cBox = (CheckBox) rowView.findViewById(R.id.checkBox1);
cBox.setTextColor(0xFFFFFFFF);
cBox.setText(values[position]);
cBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
itemChecked.set(position, true);
// do some operations here
} else {
itemChecked.set(position, false);
// do some operations here
}
}
});
cBox.setChecked(itemChecked.get(position));
return rowView;
}
}
我的主要活动：
public class TheKevinAndEricaBoxActivity extends Activity {
/** Called when the activity is first created. */
private String[] myString;
private String list;
private String[] myString2;
private String list2;
private static final Random rgenerator = new Random();
private static final Random rgenerator2 = new Random();
MediaPlayer mp;
final Context mContext = this;
final Context context = this;
private Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources res = getResources();
addListenerOnButton();
myString = res.getStringArray(R.array.myArray);
list = myString[rgenerator.nextInt(myString.length)];
myString2 = res.getStringArray(R.array.myArray2);
list2 = myString2[rgenerator.nextInt(myString2.length)];
}
public void addListenerOnButton() {
final Context context2 = this;
ImageButton ibg = (ImageButton) findViewById(R.id.buttongallery);
ibg.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(context2, App2Activity.class);
startActivityForResult(intent, 0);
}
});
ImageButton ib = (ImageButton) findViewById(R.id.imagebutton1);
ib.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View erica) {
AlertDialog.Builder b = new AlertDialog.Builder(
TheKevinAndEricaBoxActivity.this);
b.setMessage(myString[rgenerator.nextInt(myString.length)]);
b.setTitle(R.string.title1);
b.setIcon(R.drawable.menuiconerica);
b.setPositiveButton("Back",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.cancel();
}
});
Dialog d = b.create();
d.show();
}
});
ImageButton ib2 = (ImageButton) findViewById(R.id.imagebutton2);
ib2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View kevin) {
AlertDialog.Builder b = new AlertDialog.Builder(
TheKevinAndEricaBoxActivity.this);
b.setMessage(myString2[rgenerator2.nextInt(myString2.length)]);
b.setTitle(R.string.title2);
b.setIcon(R.drawable.menuiconkevin);
b.setPositiveButton("Back",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.cancel();
}
});
Dialog d = b.create();
d.show();
}
});
ImageButton Ib3 = (ImageButton) findViewById(R.id.imagebutton3);
Ib3.setOnClickListener(new View.OnClickListener() {
public void onClick(View lemonclick) {
mp = MediaPlayer.create(getApplicationContext(),R.raw.lemonspeech);
mp.start();
}
});
button = (Button) findViewById(R.id.button01);
// add button listener
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// custom dialog
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.list);
dialog.setTitle("The List");
// set the custom dialog components - text, image and button
//TextView text = (TextView) dialog.findViewById(R.id.TextView01);
//text.setText("Did you not read the button? :P i'm not finshed on this yet XD");
ListView listView = (ListView) findViewById(R.id.myList);
String[] values = new String[] { "value1", "value2", };
MobileArrayAdapter mAdapter = new MobileArrayAdapter(getBaseContext(), values);
ListView mListView = (ListView) dialog.findViewById(R.id.myList);
mListView.setAdapter(mAdapter);
Button dialogButton = (Button) dialog.findViewById(R.id.Button01);
// if button is clicked, close the custom dialog
dialogButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();
}
});
}
}
答案 0 :(得分：4)
在OnCLickListener Button添加此内容：
//...
// custom dialog
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.list);
dialog.setTitle("The List");
prefs = PreferenceManager.getDefaultSharedPreferences(this);
prefsEditor = prefs.edit();
String currentlyStored = prefs.getString("checked_list", null);
int[] savedStatus = null;
if (currentlyStored != null) {
String[] tmp = currentlyStored.split(",");
savedStatus = new int[tmp.length];
for (int i = 0; i < tmp.length; i++) {
savedStatus[i] = Integer.parseInt(tmp[i]);
}
}
adapter = new MobileArrayAdapter(this, soundnames, savedStatus);
ListView mListView = (ListView) dialog.findViewById(R.id.myList);
mListView.setAdapter(mAdapter);
//...
其中：
private SharedPreferences prefs;
private SharedPreferences.Editor prefsEditor;
private MobileArrayAdapter adapter;
您的班级中包含ListView的字段（adapter字段将保存您在列表中设置的适配器对象。）
修改自定义适配器的构造函数，如下所示：
public MobileArrayAdapter(Context context, String[] values,
int[] oldStatus) {
super(context, R.layout.adapters_simpleplay_row, values);
this.context = context;
this.values = values;
// make every CheckBox unchecked and then loop through oldStatus(if
// not null)
for (int i = 0; i < this.getCount(); i++) {
itemChecked.add(i, false);
}
if (oldStatus != null) {
for (int j = 0; j < oldStatus.length; j++) {
itemChecked.set(oldStatus[j], true);
}
}
}
还在自定义适配器MobileArrayAdapter中添加以下方法：
public ArrayList<Boolean> getCheckedStatus() {
return itemChecked;
}
最后在你的dialogButton的监听器中添加：
dialogButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String toStore = "";
ArrayList<Boolean> status = adapter.getCheckedStatus();
for (int i = 0; i < status.size(); i++) {
if (status.get(i)) {
toStore += i + ",";
}
}
prefsEditor.putString("checked_list", toStore.equals("") ? null
: toStore.substring(0, toStore.length() - 1));
prefsEditor.commit();
dialog.dismiss();
}
});
答案 1 :(得分：1)
要保存选择，请创建一个方法saveSelections并在onPause()和onDestroy()中调用它，或创建一个Button来为您执行相同操作...
编辑：
由于您使用的是ListView，它是MultipleChoice，我想您可以在onCreate中执行此操作...
listView = (ListView) findViewById(R.id.list);
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
listView.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice,
android.R.id.text1, names));
在onCreate（）
之外创建这三个方法private void LoadSelections() {
SharedPreferences sp = getPreferences(MODE_PRIVATE);
if (sp.contains(LOAD_LIST)) {
String savedItems = sp.getString(LOAD_LIST, "");
this.selectedItems.addAll(Arrays.asList(savedItems.split(",")));
int count = this.listView.getAdapter().getCount();
for (int i = 0; i < count; i++) {
String currentItem = (String) listView.getAdapter().getItem(i);
if (this.selectedItems.contains(currentItem)) {
this.listView.setItemChecked(i, true);
}
}
}
}
public void SaveSelections() {
SharedPreferences sp = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor prefEditor = sp.edit();
String savedItems = getSavedItems();
prefEditor.putString(LOAD_LIST, savedItems);
prefEditor.commit();
}
private String getSavedItems() {
String savedItems = "";
int count = listView.getAdapter().getCount();
for (int i = 0; i < count; i++) {
if (listView.isItemChecked(i)) {
if (savedItems.length() > 0) {
savedItems += "," + listView.getItemAtPosition(i);
} else {
savedItems += listView.getItemAtPosition(i);
}
}
}
return savedItems;
}
然后在onPause（）中，执行以下操作：
@Override
protected void onPause() {
SaveSelections();
super.onPause();
}
然后终于在onCreate上调用了这个..
LoadSelections();
答案 2 :(得分：0)
你可以创建一个0＆amp;的字符串1并使用共享首选项存储它。您使用的复选框（或视图数）的数量将是字符串的长度。你可以相应地保存它。
例如：
String s[]="0000000000";
for (i=0;i<s.length();i++)
if (checkboxAtLocation(i)==true) //checkboxAtLocation() will return a boolean variable on basis of its checked or not
s[i]=1;
现在存储此字符串。 再次启动活动时，请使用此字符串设置复选框。
这实现起来有点复杂，但据我所知，这是最有效的方式。 我希望它能解决你的疑问。