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[英]Comparing the data from a database with the item selected on spinner- Android
[英]spinner selected item to open new array list using database android
我在RecyclerView
顯示了多行,並在一個過濾器的頂部選擇了過濾器,打開了Spinner
然后選擇Spinner
項目以僅打開選定列表,如何顯示
我在android編程中是新的
我的課
private List<People> peolesListAll = new ArrayList<>();
private RecyclerView recyclerView;
private AlertAllCustomeAdapter alertAllCustomAdapter;
private DataBaseHelper db;
Spinner spinner;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alertlist_all);
BuildData();
spinner = (Spinner) findViewById(R.id.spinner);
spinner.setOnItemSelectedListener(this);
spinnerData();
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
alertAllCustomAdapter = new AlertAllCustomeAdapter(this, peolesListAll);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(alertAllCustomAdapter);
alertAllCustomAdapter.notifyItemRangeChanged(0, alertAllCustomAdapter.getItemCount());
private void spinnerData() {
db = new DataBaseHelper(getApplicationContext());
List<String> lables = db.getAllLabels();
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, lables);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// lables.set(0, "ALL");
spinner.setAdapter(dataAdapter);
}
private List<People> BuildData() {
db = new DataBaseHelper(getApplicationContext());
try {
db.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
if (db.open()) {
peolesListAll = db.getAllPeople();
}
return peolesListAll;
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
在onItemSelected
方法中,您可以從微調器數據(此處為List標簽)中檢索帶有position
參數的選定過濾器。 然后,重新填充您的Recylcer adadpter並調用adapter.notifyDataSetChanged()
以更新視圖,如下所示:
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String filter = (String) spinner.getAdapter().getItem(position);
// update your peolesListAll according to the selected filter (with loop or anything else)
alertAllCustomAdapter.setData(peolesListAll) // write setData(List<People> data)
alertAllCustomAdapter.notifyDataSetChanged();
}
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