J'ai une erreur dans mon code.ClassCastException: La chaîne ne peut pas être convertie en
logcat:
java.lang.ClassCastException: java.lang.String ne peut pas être jeté à com.example.aymen.schoolmanager.dates à com.example.aymen.schoolmanager.Adapter. onBindViewHolder (Adapter.java:68) à com.example.aymen.schoolmanager.Adapter.onBindViewHolder (Adapter.java:20) à android.support.v7.widget.RecyclerView $ Adapter.onBindViewHolder (RecyclerView.java: 6356) à android.support.v7.widget.RecyclerView $ Adapter.bindViewHolder (RecyclerView.java:6389) à android.support.v7.widget.RecyclerView $ Recycler.tryBindViewHolderByDeadline (RecyclerView.java:5335) à android.support .v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline (RecyclerView.java:5598) à android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition (RecyclerView.java:5440) à android.support.v7.widget .RecyclerView $ Recycler.getViewForPosition (RecyclerView.java:5436) au android.support.v7.widget.LinearLayoutManager $ Layo utState.next (LinearLayoutManager.java:2224) à android.support.v7.widget.LinearLayoutManager.layoutChunk (LinearLayoutManager.java:1551) à android.support.v7.widget.LinearLayoutManager.fill (LinearLayoutManager.java: 1511) à android.support.v7.widget.LinearLayoutManager.onLayoutChildren (LinearLayoutManager.java:595) à android.support.v7.widget.RecyclerView.dispatchLayoutStep2 (RecyclerView.java:3583) à android.support .v7.widget.RecyclerView.dispatchLayout (RecyclerView.java:3312) au et roid.support.v7.widget.RecyclerView.onLayout (RecyclerView.java:3844) à android.view.View.layout (View.java:17637) à android.view.ViewGroup.layout (ViewGroup.java:5575) à android.widget.RelativeLayout.onLayout (RelativeLayout.java:1079) à android.view.View.layout (View.java:17637) à android.view.ViewGroup.layout (ViewGroup.java:5575) à android.support.v4.view.ViewPager.onLayout (ViewPager.java:1795) à android.view.View.layout (View.java:17637) à android.view.ViewGroup.layout (ViewGroup.java:5575) au android.support.design.widget.HeaderScrollingViewBehavior.layoutChild (HeaderScrollingViewBehavior.java:131) à android.support.design.widget.ViewOffsetBehavior.onLayoutChild (ViewOffsetBehavior.java:42) à android.support.design.widget .AppBarLayout $ ScrollingViewBehavior.onLayoutChild (AppBarLayout.java:1391) à android.support.design.widget.CoordinatorLayout.onLayout (CoordinatorLayout.java:870) à android.view.View.layout (View.java:17637) à android.view.ViewGroup.mise en page (ViewGroup.java:5575) at android.widget.FrameLayout.layoutChildren (FrameLayout.java:323) à android.widget.FrameLayout.onLayout (FrameLayout.java:261) at android.view.View.layout (View.java:17637) à android.view.ViewGroup.layout (ViewGroup.java:5575) à android.widget.LinearLayout.setChildFrame (LinearLayout.java:1741) à android.widget.LinearLayout.layoutVertical (LinearLayout. java: 1585) chez android.widget.LinearLayout.onLayout (LinearLayout.java:1494) at android.view.View.layout (View.java:17637) at android.view.View Group.layout (ViewGroup.java:5575) à android.widget.FrameLayout.layoutChildren (FrameLayout.java:323) à android.widget.FrameLayout.onLayout (FrameLayout.java:261) à android.view.View. layout (View.java:17637) à android.view.ViewGroup.layout (ViewGroup.java:5575) à android.widget.LinearLayout.setChildFrame (LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1585) à android.widget.LinearLayout.onLayout (LinearLayout.java:1494) à android.view.View.layout (View.java:17637) at android.vie w.ViewGroup.layout (ViewGroup.java:5575) à android.widget.FrameLayout.layoutChildren (FrameLayout.java:323) à android.widget.FrameLayout.onLayout (FrameLayout.java:261) à com.android. internal.policy.DecorView.onLayout (DecorView.java:726) à android.view.View.layout (View.java:17637) à android.view.ViewGroup.layout (ViewGroup.java:5575) à android. view.ViewRootImpl.performLayout (ViewRootImpl.java:2346) at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2068) 06-22 10: 11: 41.107 22646-22646/com.example.aymen.schoolmanager E/AndroidRuntime: à android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1254) à android.view.ViewRootImpl $ TraversalRunnable.run (ViewRootImpl.java:6337) à android.view.Choreographer $ CallbackRecord.run (Choreographer.java : 874) à android.view.Choreographer.doCallbacks (Choreographer.java:686) à android.view.Choreographer.doFrame (Choreographer.java:621) à android.view.Choreographer $ FrameDisplayEventReceiver.run (chorégraphe. java: 860) à android.os.Handler.handleCallback (Handler.java:751) à android.os.Handler.dispatc hMessage (Handler.java:95) à android.os.Looper.loop (Looper.java:154) à android.app.ActivityThread.main (ActivityThread.java:6119) à java.lang.reflect.Method. appelez (méthode native) à com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:886) à com.android.internal.os.ZygoteInit.main (ZygoteInit.java: 776)
ligne 68 points à:
holder.textViewHead.setText(idd.get(position).getSubject());
ligne 20 points à:
class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder>
Voici mon code:
Mon gestionnaire de classe de base de données:
public class DBhandler extends SQLiteOpenHelper {
private static final String databas_name="newdata.db";
public static final int databas_version=1;
public static String ID="id";
int id;
SQLiteDatabase dj;
ArrayList<dates> er=new ArrayList<dates>();
SQLiteDatabase db;
DBhandler helper;
String TYPE="type";
String sub="Subject";
String Title="Title";
String det="Detail";
String TabN="ClassExams";
int i;
public DBhandler(Context context)
{
super(context,databas_name,null,databas_version);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE if not EXISTS ClassExams(id INTEGER primary key,type TEXT,Subject TEXT,Title TEXT,Detail TEXT) ");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP table if EXISTS ClassExams");
onCreate(db);
}
public void insert(String type, String sub, String title, String detaill)
{
SQLiteDatabase db=this.getWritableDatabase();
ContentValues contentValues=new ContentValues();
contentValues.put("type",type);
contentValues.put("Subject",sub);
contentValues.put("Title",title);
contentValues.put("Detail",detaill);
db.insert("ClassExams",null,contentValues);
db.close();
}
public ArrayList getAs(String Type)
{
String DATABASE_TABLE="ClassExams";
String type="type";
String quer = "SELECT * FROM " + DATABASE_TABLE + " WHERE " + type + "='" + Type+"'";
ArrayList arrayList=new ArrayList();
SQLiteDatabase db=this.getReadableDatabase();
Cursor res=db.rawQuery(quer,null);
res.moveToFirst();
while (res.isAfterLast()==false){
arrayList.add(res.getString(res.getColumnIndex("id")));
// arrayList.add(res.getString(res.getColumnIndex("Subject")));
// arrayList.add(res.getString(res.getColumnIndex("Title")));
// arrayList.add(res.getString(res.getColumnIndex("Detail")));
res.moveToNext();
}
return arrayList;
}
public void deleteNote(int x){
String TABLE_NAME="ClassExams";
String ID="id";
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_NAME, ID + " = ?",new String[] {String.valueOf(x)});
}
}
Ma classe adaptateur:
public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
Context activity;
private ArrayList<dates> idd;
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView textViewHead;
public TextView textViewDown;
public TextView buttonViewOption;
public int position;
public ViewHolder(View itemView) {
super(itemView);
textViewHead = (TextView) itemView.findViewById(id.text1);
textViewDown = (TextView) itemView.findViewById(id.text2);
buttonViewOption = (TextView) itemView.findViewById(R.id.textViewOptions);
}
}
public Adapter (Context context, ArrayList<dates> id) {
this.activity=context;
this.idd=id;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater=LayoutInflater.from(activity);
// View row=inflater.inflate(layout.costum_row,parent,false);
View view = LayoutInflater.from(parent.getContext()).inflate(layout.costum_row, null);
ViewHolder holder=new ViewHolder(view);
return holder;
}
public void onBindViewHolder(final Adapter.ViewHolder holder, final int position) {
// dates object=idd.get(position);
// String firstText = object.getDetail();
// String secondText = object.getSubject();
holder.textViewDown.setText("Somthing");
holder.textViewHead.setText(idd.get(position).getSubject());
holder.buttonViewOption.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
PopupMenu popup = new PopupMenu(activity, holder.buttonViewOption);
popup.inflate(R.menu.option_menu);
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case id.Update:
break;
case R.id.menu2:
break;
case id.Delete:
delete();
//db.deleteNote(Integer.parseInt(j));
// db.deleteNote(getid);
}
return false;
}
});
//displaying the popup
popup.show();
}
public void delete() {
idd.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, idd.size());
holder.itemView.setVisibility(View.GONE);
}
});
}
@Override
public int getItemCount() {
return idd.size();}}
Ma classe:
public class dates {
String Subject,Title,Detail,type;
int id;
public dates(String subject, String title, String detail, String type, int id) {
this.Subject = subject;
this.Title = title;
this.Detail = detail;
this.type = type;
this.id = id;
}
dates()
{
}
public String getSubject() {
return Subject;
}
public void setSubject(String subject) {
Subject= subject;
}
public String getTitle() {
return Title;
}
public void setTitle(String title) {
Title = title;
}
public String getDetail() {
return Detail;
}
public void setDetail(String detail) {
Detail = detail;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getId() {
return id;
}
public void seti(int id) {
this.id = id;
}
Il n'y a pas coulé de type dans la ligne que vous avez montré . S'il vous plaît poster la trace de la pile complète. Si vous avez correctement identifié la ligne, l'erreur est dans l'une des méthodes appelées à partir de cette ligne. – Henry
@Henry holder.textViewHead.setText (idd.get (position) .getSubject()); –
Cela semble très étrange. Êtes-vous sûr que la trace de la pile correspond au dernier code? Essayez de reconstruire complètement et de réinstaller l'application. – Henry