如何解决如何实现多语言android应用程序？
我正在创建一个使用 expendableListView 在 android studio 中实现多语言的应用程序。使用 Youtube 上的一些教程，我实现了多语言，但它不起作用。我不知道为什么，但根据性能，似乎重新创建了应用程序，但它并没有改变语言。
Expendablelistadapter 类在这里：
public class Customexpandablelistadapter extends Baseexpandablelistadapter {
private static final int GROUP_TYPE_0 = 0;
private static final int GROUP_TYPE_1 = 1;
private static final int CHILD_TYPE_1 = 0;
private static final int CHILD_TYPE_2 = 1;
private Context context;
private List<String> listTitulo;
private HashMap<String,Contacto> expandableListDetalles;
Contextwrapper contextwrapper;
public Customexpandablelistadapter(Context context,List<String> listTitulo,HashMap<String,Contacto> expandableListDetalles) {
this.context = context;
this.listTitulo = listTitulo;
this.expandableListDetalles = expandableListDetalles;
contextwrapper=new Contextwrapper(context);
}
@Override
public View getChildView(final int groupPosition,int childPosition,boolean isLastChild,View convertView,ViewGroup parent) {
final Contacto contacto = (Contacto) getChild(groupPosition,childPosition);
LayoutInflater inflater = (LayoutInflater) this.context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Integer childType = new Integer(getChildType(groupPosition,childPosition));
// We need to create a new "cell container"
if (convertView == null || convertView.getTag() != childType) {
switch (childType) {
case CHILD_TYPE_1:
convertView = inflater.inflate(R.layout.language_layout,null);
convertView.setTag(childType);
break;
case CHILD_TYPE_2:
convertView = inflater.inflate(R.layout.language_layout,null);
convertView.setTag(childType);
break;
default:
// Maybe we should implement a default behavIoUr but it should be ok we kNow there are 4 child types right?
break;
}
}
// We'll reuse the existing one
else {
// There is nothing to do here really we just need to set the content of view which we do in both cases
}
switch (childType) {
case CHILD_TYPE_1:
RadioGroup radioGroup2=convertView.findViewById(R.id.radioMainGroup);
RadioButton rButton3= convertView.findViewById(R.id.radioButton1);
rButton3.setText(contacto.geTradio1());
rButton3.setonCheckedchangelistener(new CompoundButton.OnCheckedchangelistener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (isChecked){
}
}
});
RadioButton rButton4= convertView.findViewById(R.id.radioButton2);
rButton4.setText(contacto.geTradio2());
rButton4.setonCheckedchangelistener(new CompoundButton.OnCheckedchangelistener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (isChecked){
}
}
});
break;
case CHILD_TYPE_2:
RadioGroup radioGroup=convertView.findViewById(R.id.radioMainGroup);
RadioButton rButton= convertView.findViewById(R.id.radioButton1);
rButton.setText(contacto.geTradio1());
rButton.setonCheckedchangelistener(new CompoundButton.OnCheckedchangelistener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (isChecked){
setLocale("fa-rIR");
((Activity)context).recreate();
}
}
});
RadioButton rButton2 = convertView.findViewById(R.id.radioButton2);
rButton2.setText(contacto.geTradio2());
rButton2.setonCheckedchangelistener(new CompoundButton.OnCheckedchangelistener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (isChecked){
setLocale("en");
((Activity)context).recreate();
}
}
});
break;
}
return convertView;
}
public void setLocale(String s) {
Locale locale=new Locale(s);
Locale.setDefault(locale);
Configuration config=new Configuration();
config.locale=locale;
((Activity)context).getBaseContext().getResources().updateConfiguration(config,((Activity)context).getBaseContext().getResources().getdisplayMetrics());
SharedPreferences.Editor editor=context.getSharedPreferences("settings",Context.MODE_PRIVATE).edit();
editor.putString("My_Lang",s);
editor.apply();
}
public void loadLocale(){
SharedPreferences prefs=context.getSharedPreferences("settings",Activity.MODE_PRIVATE);
String language=prefs.getString("My_Lang","");
setLocale(language);
}
@Override
public View getGroupView(int groupPosition,boolean isExpanded,ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) this.context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
String nombre = (String) getGroup(groupPosition);
Contacto contacto = (Contacto) getChild(groupPosition,0);
Integer groupType = new Integer(getGroupType(groupPosition));
// We need to create a new "cell container"
if (convertView == null || convertView.getTag() != groupType) {
switch (groupType) {
case GROUP_TYPE_0 :
convertView = inflater.inflate(R.layout.list_group,null);
break;
default:
convertView = inflater.inflate(R.layout.list_group,null);
// Maybe we should implement a default behavIoUr but it should be ok we kNow there are 3 group types right?
break;
}
}
// We'll reuse the existing one
else {
// There is nothing to do here really we just need to set the content of view which we do in both cases
}
switch (groupType) {
case GROUP_TYPE_0 :
ImageView imgV=convertView.findViewById(R.id.groupImageView);
Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(),contacto.getImg());
imgV.setimageBitmap(bitmap);
TextView txtNombre = convertView.findViewById(R.id.txtGroupNombre);
txtNombre.setText(nombre);
break;
default:
ImageView imgV1=convertView.findViewById(R.id.groupImageView);
Bitmap bitmap1 = BitmapFactory.decodeResource(context.getResources(),contacto.getImg());
imgV1.setimageBitmap(bitmap1);
TextView txtNombre1 = convertView.findViewById(R.id.txtGroupNombre);
txtNombre1.setText(nombre);
break;
}
return convertView;
}
@Override
public int getGroupType(int groupPosition) {
switch (groupPosition) {
case 0:
return GROUP_TYPE_0;
default:
return GROUP_TYPE_1;
}
}
@Override
public int getChildType(int groupPosition,int childPosition) {
switch (groupPosition) {
case 0:
return CHILD_TYPE_1;
default:
return CHILD_TYPE_2;
}
}
@Override
public int getGroupCount() {
return this.listTitulo.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return 1;
}
@Override
public Object getGroup(int groupPosition) {
return this.listTitulo.get(groupPosition);
}
@Override
public Object getChild(int groupPosition,int childPosition) {
return this.expandableListDetalles.get(this.listTitulo.get(groupPosition));//////////////////////////////////////////////
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition,int childPosition) {
return childPosition;
}
@Override
public boolean hasstableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition,int childPosition) {
return true;
}
@Override
public int getChildTypeCount() {
return 2;
}
@Override
public int getGroupTypeCount() {
return 2;
}
}
您应该注意到，因为我无法直接访问 Activity，所以我将上下文转换为 (Activity)context 以使用诸如 getBaseContext() 之类的函数，有时我单独使用上下文。
我的 string.xml 是“英语”语言：
<resources>
<string name="app_name">ExpandableListView</string>
<string name="dracula">Dracula</string>
<string name="white">white</string>
<string name="english">English</string>
<string name="persian">فارسی</string>
<string name="lang">Language</string>
<string name="theme">Theme</string>
strings.xml(fa-rIR) 是“波斯”语言：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">ExpandableListView</string>
<string name="dracula">دراکولا</string>
<string name="white">سفید</string>
<string name="english">English</string>
<string name="persian">فارسی</string>
<string name="lang">زبان</string>
<string name="theme">زمینه</string>
</resources>
这里是 mainActivity.class :
public class MainActivity extends AppCompatActivity {
private ExpandableListView expandableListView;
private expandablelistadapter expandablelistadapter;
private List<String> expandableListNombres;
private HashMap<String,Contacto> listaContactos;
private int lastExpandedPosition = -1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
expandableListView.setAdapter(expandablelistadapter);
expandableListView.setonGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
if(lastExpandedPosition != -1 && groupPosition != lastExpandedPosition){
expandableListView.collapseGroup(lastExpandedPosition);
}
lastExpandedPosition = groupPosition;
}
});
}
private void init() {
this.expandableListView = findViewById(R.id.expandableListView);
this.listaContactos = getContactos();
this.expandableListNombres = new ArrayList<>(listaContactos.keySet());
this.expandablelistadapter = new Customexpandablelistadapter(this,expandableListNombres,listaContactos);
}
private HashMap<String,Contacto> getContactos() {
HashMap<String,Contacto> listaC = new HashMap<>();
listaC.put(getString(R.string.lang),new Contacto(R.string.english,R.string.persian,R.drawable.img_11));
listaC.put(getString(R.string.theme),new Contacto(R.string.dracula,R.string.white,R.drawable.img_22));
return listaC;
}
}
还有，这是 Contacto.java：
package elv.iso.com.expandablelistview;
公开课联系{
private int radio1,radio2;
private int img;
public Contacto(int radio1,int radio2,int img1) {
this.radio1 = radio1;
this.radio2 = radio2;
this.img=img1;
}
public int geTradio1() {
return radio1;
}
public int geTradio2() {
return radio2;
}
public int getImg() {
return img;
}
}
如您所见，这是一个简单的应用程序。但我不知道为什么这不起作用。 也许应用程序的图形视图很有用： app view
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