Android:如何在自定义首选项(布局)中使用非默认SharedReference(数据)
对于此机会,我需要使用非默认(即自定义)SharedReference数据。如何在自定义首选项布局中访问此自定义SharedReference数据?在这种情况下,I不能使用getDefaultSharedReferences(上下文) 我构建了一个自定义的listpreference,允许向其中添加新元素。 我必须使用安卓4。对于这个不太重要的问题 简单的main活动只是显示只有一个自定义首选项布局的首选项列表Android:如何在自定义首选项(布局)中使用非默认SharedReference(数据),android,android-preferences,android-sharedpreferences,Android,Android Preferences,Android Sharedpreferences,对于此机会,我需要使用非默认(即自定义)SharedReference数据。如何在自定义首选项布局中访问此自定义SharedReference数据?在这种情况下,I不能使用getDefaultSharedReferences(上下文) 我构建了一个自定义的listpreference,允许向其中添加新元素。 我必须使用安卓4。对于这个不太重要的问题 简单的main活动只是显示只有一个自定义首选项布局的首选项列表 public class MainActivity extends Preferen
public class MainActivity extends PreferenceActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
PreferenceManager prefMgr = getPreferenceManager();
prefMgr.setSharedPreferencesName("my_preferences");
prefMgr.setSharedPreferencesMode(MODE_PRIVATE);
try {
addPreferencesFromResource( R.xml.preferences);
} catch (Exception e) {
e.printStackTrace();
}
}
}
res/xml/preferences.xml文件包含:
<nl.xyz.listpreferenceexpandable.ListPreferenceExpandable
android:key="custom3"
android:title="CustomList3"
android:dialogTitle="Add custom item"
android:entries="@array/customdata1"
android:entryValues="@array/customdata1"/>
自定义ListPreference代码如下所示。
问题是:如何访问名为“my_preferences”的自定义共享首选项数据?
当我只调用一个getPreferenceManager()时,就会得到null
public class ListPreferenceExpandable extends ListPreference {
CustomListPreferenceAdapter customListPreferenceAdapter = null;
Context mContext;
private LayoutInflater mInflater;
List<String> entries;
ArrayList<RadioButton> rButtonList;
SharedPreferences prefs;
SharedPreferences.Editor editor;
String current;
String keyDefault;
String keyData;
public ListPreferenceExpandable(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
mInflater = LayoutInflater.from(context);
rButtonList = new ArrayList<RadioButton>();
// THIS IS WRONG:
prefs = PreferenceManager.getDefaultSharedPreferences(context);
// QUESTION: How can I access SharedPreference "my_preferences"
editor = prefs.edit();
keyDefault = getKey();
keyData = getKey() + "_data"; // will hold the dynamically data
String prefDefault = getPersistedString( getKey() );
current = prefs.getString( keyDefault, prefDefault);
setSummary( current);
}
@Override
protected void onPrepareDialogBuilder(Builder builder) {
getData();
customListPreferenceAdapter = new CustomListPreferenceAdapter(mContext);
builder.setAdapter(customListPreferenceAdapter, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
System.out.println( "Clicked ... on " + which);
}
});
builder.setNeutralButton( "Add", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
inputDialog( "Add new entry");
}
});
}
private void getData() {
String data = prefs.getString( keyData, "");
if( data.isEmpty()) {
entries = new ArrayList<>();
CharSequence[] loadedFromTheResource = getEntries();
if( loadedFromTheResource == null || loadedFromTheResource.length < 1) {
loadedFromTheResource = getEntryValues();
}
if( loadedFromTheResource != null && loadedFromTheResource.length > 0) {
for (CharSequence cs : loadedFromTheResource) {
entries.add(cs.toString());
}
}
} else {
String[] loaded = data.split("\\s*#\\s*");
if( loaded != null && loaded.length > 0) {
entries = Arrays.asList( loaded);
entries = new ArrayList<>(entries);
}
}
if( entries.isEmpty()) {
entries.add(current);
}
}
private void saveData() {
SharedPreferences.Editor editor = prefs.edit();
editor.putString( keyData, TextUtils.join("#", entries));
editor.apply();
}
void inputDialog( String title) {
Builder builder = new Builder( mContext); // this
builder.setTitle(title);
final EditText input = new EditText( mContext); // this
input.setInputType(InputType.TYPE_CLASS_TEXT);
builder.setView(input);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String newEntry = input.getText().toString();
entries.add( newEntry);
customListPreferenceAdapter.notifyDataSetChanged();
saveData();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
static class ViewHolder {
protected TextView nameT = null;
protected TextView formulaT = null;
}
private class CustomListPreferenceAdapter extends BaseAdapter {
private int mSelectedPosition = -1;
private RadioButton mSelectedRB;
public CustomListPreferenceAdapter(Context context) { }
public int getCount() {
return entries.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
View row = convertView;
CustomHolder holder;
if(convertView == null) {
row = mInflater.inflate(R.layout.custom_list_preference_row, parent, false);
holder = new CustomHolder( row, position);
row.setTag(holder);
} else {
holder = (CustomHolder) row.getTag();
}
holder.row.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String current = entries.get(position).toString();
editor.putString(keyDefault, current).apply();
setSummary(current);
Dialog mDialog = getDialog();
mDialog.dismiss();
}
});
String currentSelection = prefs.getString( keyDefault, "");
if( entries.get(position).equals( currentSelection)) {
holder.rButton.setChecked(true);
} else {
holder.rButton.setChecked(false);
}
holder.text.setText( entries.get(position));
return row;
}
class CustomHolder {
private TextView text = null;
private RadioButton rButton = null;
private View row = null;
CustomHolder( View row, int position1) {
text = (TextView)row.findViewById(R.id.custom_list_view_row_text_view);
rButton = (RadioButton)row.findViewById(R.id.custom_list_view_row_radio_button);
this.row = row;
}
public RadioButton getRadioButton() {
return rButton;
}
}
}
}
公共类ListPreferenceExpandable扩展ListPreference{
CustomListPreferenceAdapter CustomListPreferenceAdapter=null;
语境;
私人停车场;
列出条目;
ArrayList按钮列表;
共享引用优先权;
SharedReferences.Editor;
串电流;
字符串键默认值;
字符串键数据;
公共列表首选项可扩展(上下文、属性集属性){
超级(上下文,attrs);
mContext=上下文;
mInflater=LayoutInflater.from(上下文);
rButtonList=newarraylist();
//这是错误的:
prefs=PreferenceManager.GetDefaultSharedReferences(上下文);
//问题:我如何访问SharedReference“我的首选项”
editor=prefs.edit();
keyDefault=getKey();
keyData=getKey()+“_data”;//将动态保存数据
String prefDefault=getPersistedString(getKey());
current=prefs.getString(keyDefault,prefdault);
设置摘要(当前);
}
@凌驾
受保护的无效onPrepareDialogBuilder(生成器){
getData();
customListPreferenceAdapter=新的customListPreferenceAdapter(mContext);
setAdapter(customListPreferenceAdapter,新的DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
System.out.println(“单击“+which”);
}
});
builder.setNeutralButton(“添加”,新建DialogInterface.OnClickListener(){
@凌驾
public void onClick(DialogInterface dialog,int which){
输入对话框(“添加新条目”);
}
});
}
私有void getData(){
字符串数据=prefs.getString(keyData,“”);
if(data.isEmpty()){
entries=newarraylist();
CharSequence[]loadedFromTheResource=getEntries();
if(loadedFromTheResource==null | | loadedFromTheResource.length<1){
loadedFromTheResource=getEntryValues();
}
if(loadedFromTheResource!=null&&loadedFromTheResource.length>0){
用于(字符序列cs:loadedFromTheResource){
entries.add(cs.toString());
}
}
}否则{
String[]loaded=data.split(\\s*#\\s*);
如果(已加载!=null&&load.length>0){
条目=数组.asList(已加载);
条目=新的ArrayList(条目);
}
}
if(entries.isEmpty()){
条目。添加(当前);
}
}
私有void saveData(){
SharedReferences.Editor=prefs.edit();
putString(keyData,TextUtils.join(“#”,entries));
editor.apply();
}
无效输入对话框(字符串标题){
Builder=newbuilder(mContext);//这个
建造商名称(名称);
最终编辑文本输入=新编辑文本(mContext);//此
input.setInputType(InputType.TYPE\u CLASS\u TEXT);
builder.setView(输入);
setPositiveButton(“确定”,新的DialogInterface.OnClickListener(){
@凌驾
public void onClick(DialogInterface dialog,int which){
String newEntry=input.getText().toString();
条目。添加(新条目);
customListPreferenceAdapter.notifyDataSetChanged();
saveData();
}
});
setNegativeButton(“取消”,新建DialogInterface.OnClickListener()){
@凌驾
public void onClick(DialogInterface dialog,int which){
dialog.cancel();
}
});
builder.show();
}
静态类视窗夹{
受保护的文本视图名称t=null;
受保护的TextView formulaT=null;
}
私有类CustomListPreferenceAdapter扩展了BaseAdapter{
private int mSelectedPosition=-1;
专用单选按钮mSelectedRB;
公共CustomListPreferenceAdapter(上下文){}
public int getCount(){
返回条目。size();
}
公共对象getItem(int位置){
返回位置;
}
公共长getItemId(int位置){
返回位置;
}
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
视图行=转换视图;
客户持有人;
if(convertView==null){
行=mInflater.flate(R.layout.custom\u list\u preference\u行,父项,false);
持有人=新的客户持有人(行、位置);
row.setTag(支架);
}否则{
holder=(CustomHolder)行。getTag();
}
holder.row.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
字符串current=entries.get(position.toString();
编辑器.putString(keyDefau
<string-array name="customdata1">
<item name="One">One</item>
<item name="Two">Two</item>
</string-array>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/custom_list_view_row_table_row"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="8dip"
android:paddingTop="8dip"
android:paddingLeft="10dip"
android:paddingRight="10dip">
<TextView
android:id="@+id/custom_list_view_row_text_view"
android:textSize="22sp"
android:textColor="#000000"
android:gravity="center_vertical"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content" />
<RadioButton
android:checked="false"
android:layout_width="40dp"
android:layout_weight="0"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:id="@+id/custom_list_view_row_radio_button"/>
</LinearLayout>
<nl.xyz.listpreferenceexpandable.ListPreferenceExpandable
android:key="custom3"
android:title="CustomList3"
android:dialogTitle="Add custom item"
android:entries="@array/customdata1"
**** sharedPreference="sharedpreferences_of_targetgroup_n" ****
android:entryValues="@array/customdata1"/>
String sharedPreference = attrs.getAttributeValue(null, "sharedPreference");
if( sharedPreference == null || sharedPreference.isEmpty()) {
prefs = PreferenceManager.getDefaultSharedPreferences(context);
} else {
prefs = context.getSharedPreferences(sharedPreference, MODE_PRIVATE);
}