Ich habe eine listview
, die mit wenigen Einträgen initialisiert wird. In der menu
Leiste habe ich eine Option zum Hinzufügen weiterer Einträge, für die eine dialog
geöffnet ist und ich drei Felder eingeben muss. Beim Klicken auf die Schaltfläche save
werden die Einträge in der listview
angezeigt, aber beim Drücken der Zurück-Taste und nach dem Neustart der App wird die ältere listview
angezeigt, d. H. Die neu eingegebenen Werte in der listview
werden nicht angezeigt.Beim Drücken der Zurück-Taste sind die neuen Einträge in der ListView verschwunden
Der Hauptcode:
public class SecondScreen extends ListActivity implements AppCompatCallback,AdapterView.OnItemClickListener {
private Toolbar bar;
private AppCompatDelegate delegate;
List<Model> list;
Model selectedModel;
AGSQLiteHelper db;
Adapter adapter;
private EditText task_Title,task_Description,task_Date;
@Override
protected void onCreate(Bundle savedInstanceState) {
delegate=AppCompatDelegate.create(this,this);
super.onCreate(savedInstanceState);
//savedInstanceState.putBoolean("mIsBackButtonPressed",mIsBackButtonPressed);
delegate.setContentView(R.layout.activity_second_screen);
bar=(Toolbar)findViewById(R.id.toolbarID);
delegate.setSupportActionBar(bar);
ActionBar ab=delegate.getSupportActionBar();
ab.setDisplayHomeAsUpEnabled(true);
db=new AGSQLiteHelper(this);
db.onUpgrade(db.getWritableDatabase(),1,2);
db.createTask(new Model("abcde","description abcde","19/11/12"));
db.createTask(new Model("bcdese","description bcdese","18/12/12"));
db.createTask(new Model("mnbv","description mnbv","2/11/10"));
db.createTask(new Model("poiuy","description poiuy","1/5/6"));
list=db.getAllTasks();
adapter=new Adapter(this,R.layout.row,list);
getListView().setOnItemClickListener(this);
setListAdapter(adapter);
}
@Override
public void onBackPressed() {
super.onBackPressed();
}
@Nullable
@Override
public View onCreateView(String name, Context context, AttributeSet attrs) {
return super.onCreateView(name, context, attrs);
}
@Override
public void onSupportActionModeStarted(ActionMode mode) {
}
@Override
public void onSupportActionModeFinished(ActionMode mode) {
}
@Nullable
@Override
public ActionMode onWindowStartingSupportActionMode(ActionMode.Callback callback) {
return null;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()==R.id.add){
Toast.makeText(getApplicationContext(),"Add was clicked",Toast.LENGTH_LONG).show();
final Dialog dialog=new Dialog(SecondScreen.this);
dialog.setContentView(R.layout.custom_dialog);
dialog.setTitle("Dialog");
Button save_button=(Button)dialog.findViewById(R.id.saveButtonID);
Button cancel_button=(Button)dialog.findViewById(R.id.cancelButtonID);
task_Title=(EditText)dialog.findViewById(R.id.titleEditTextID);
task_Description=(EditText)dialog.findViewById(R.id.descriptionEditTextID);
task_Date=(EditText)dialog.findViewById(R.id.dateEditTextID);
dialog.show();
save_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
selectedModel=new Model();
selectedModel.setTask_title(task_Title.getText().toString());
selectedModel.setTask_description(task_Description.getText().toString());
selectedModel.setTask_date(task_Date.getText().toString());
db.insertTask(selectedModel);
//Toast.makeText(getApplicationContext(),"model ="+selectedModel.getTask_title(),Toast.LENGTH_LONG).show();
//Log.i("Second Screen","list length before "+list.size());
//list=db.getAllTasks();
list.add(selectedModel);
// Log.i("Second Screen","list length after "+list.size());
// Adapter adapter =(Adapter)getListView().getAdapter();
//adapter=new Adapter(this,R.layout.row,list);
adapter.notifyDataSetChanged();
//Toast.makeText(getApplicationContext(),"model ="+selectedModel.getTask_title(),Toast.LENGTH_LONG).show();
dialog.dismiss();
}
});
cancel_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
}
if(item.getItemId()==R.id.done){
Toast.makeText(getApplicationContext(),"Done was clicked",Toast.LENGTH_LONG).show();
}
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu,menu);
return true;
}
}
Irgendwelche Vorschläge?
Ich denke, Problem ist in Ihrer db.insertTask (selectedModel); Methode – NehaK