[英]How to populate Android Spinner from SQLite Database Table
我有一個SQLite數據庫,其中有2個表(很快就會有更多表),我試圖從這些表中的1個中填充微調器,並且找不到用於指定特定表的資源。
所以我目前的情況是我必須在“菜單項”和“菜單類別”表中...我在“菜單項”中有一個微調框,想要在其中填充“菜單類別”中的項。
這是我的MenuItem活動
public class SettingsMenuItem extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings_menu_item);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
countRecords();
readRecords();
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
Button buttonCreateLocation = (Button) findViewById(R.id.btnAdd);
buttonCreateLocation.setOnClickListener(new OnClickListenerCreateMenuItem());
}
public void countRecords() {
int recordCount = new TableControllerMenuItem(this).count();
TextView textViewRecordCount = (TextView) findViewById(R.id.textViewRecordCount);
textViewRecordCount.setText(recordCount + " records found.");
}
public void readRecords() {
LinearLayout linearLayoutRecords = (LinearLayout) findViewById(R.id.linearLayoutRecords);
linearLayoutRecords.removeAllViews();
List<ObjectMenuItem> menuitem = new TableControllerMenuItem(this).read();
if (menuitem.size() > 0) {
for (ObjectMenuItem obj : menuitem) {
int id = obj.id;
String menuitemName = obj.name;
String menuitemDescription = obj.description;
Float menuitemPrice = obj.price;
Float menuitemCost = obj.cost;
String textViewContents = menuitemName;
TextView textViewMenuItem= new TextView(this);
textViewMenuItem.setPadding(0, 10, 0, 10);
textViewMenuItem.setText(textViewContents);
textViewMenuItem.setTag(Integer.toString(id));
textViewMenuItem.setTextSize(20.0f);
textViewMenuItem.setOnLongClickListener(new OnLongClickListenerMenuItem());
linearLayoutRecords.addView(textViewMenuItem);
}
}
else {
TextView locationItem = new TextView(this);
locationItem.setPadding(8, 8, 8, 8);
locationItem.setText("No records yet.");
linearLayoutRecords.addView(locationItem);
}
}
這是我的MenuItem xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/editTextItemName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:hint="Item Name"
android:singleLine="true" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/editTextItemDesc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editTextItemName"
android:hint="Item Description"
android:singleLine="true" />
<EditText
android:id="@+id/editTextItemPrice"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editTextItemDesc"
android:hint="Item Price"
android:singleLine="true"
android:inputType="numberDecimal"/>
<EditText
android:id="@+id/editTextItemCost"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editTextItemPrice"
android:hint="Item Cost"
android:singleLine="true"
android:inputType="numberDecimal"/>
<Spinner
android:id="@+id/spinnerCategory"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editTextItemCost"></Spinner>
從數據庫中讀取數據,並將相關數據保存到數組中。 然后使用該數組填充ArrayAdapter,最后將其設置為微調器的適配器。
希望這可以幫助!
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