[英]Android: Populate TextView with row results (sqlite) from itemOnSelected Spinner
我想使用微調器作為菜單,以便能夠選擇鍛煉的名稱,選擇后TextView
(x4) 將填充與該名稱相關的練習。 目前 Spinner 加載了鍛煉名稱,並且已經將第一個鍛煉加載到每個TextView
的onCreation
。
There are no errors when the app is launched, but the other rows don't load into the TextViews when the the new workout name is selected.. One can only assume I have made an error in the logic.
問題:如果這是邏輯錯誤,有人可以識別它並指出方向嗎?
開始.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_begin);
loadSpinnerData();
refreshTextView();
}
public void loadTextView(){
DataHelper dataHelper = new DataHelper(this);
ArrayList<String> exercises = dataHelper.getExercises();
((TextView) findViewById(R.id.exercise1)).setText(exercises.get(0));
((TextView) findViewById(R.id.exercise2)).setText(exercises.get(1));
((TextView) findViewById(R.id.exercise3)).setText(exercises.get(2));
((TextView) findViewById(R.id.exercise4)).setText(exercises.get(3));
}
public void refreshTextView(){
Spinner databaseR = (Spinner) findViewById(R.id.databaseR);
databaseR.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
loadTextView();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
數據助手
public String Create_ex="CREATE TABLE ExerciserEasy"
+ " (ID INTEGER PRIMARY KEY AUTOINCREMENT, Workout VARCHAR, ExerciseOne VARCHAR,"
+"ExerciseTwo VARCHAR, ExerciseThree VARCHAR, ExerciseFour VARCHAR );"
public ArrayList<String> getExercises(){
ArrayList<String> list = new ArrayList<String>();
SQLiteDatabase db = this.getReadableDatabase();
db.beginTransaction();
try {
String selectQuery = " Select * from " + Table_ex1;
Cursor cursor = db.rawQuery(selectQuery, null);
if(cursor.moveToFirst()){
do{
list.add(cursor.getString(2));
list.add(cursor.getString(3));
list.add(cursor.getString(4));
list.add(cursor.getString(5));
Log.d("HIITtimer", ""+cursor.getCount());
}while(cursor.moveToNext());
}
db.setTransactionSuccessful();
}catch (Exception e){
e.printStackTrace();
}finally {
db.endTransaction();
db.close();
}
return list;
}
首先,您需要將選定的鍛煉名稱傳遞給loadTextView()
以便您可以將其傳遞給getExercises()
並根據該名稱查詢數據庫,其他代碼看起來不錯,
1- 將參數workoutName
添加到getExercises()
,並在WHERE
子句中使用它
public ArrayList<String> getExercises(String workoutName){
//codes ...
String selectQuery = " Select * from " + Table_ex1 + " WHERE Workout ='" workoutName + "'";
//codes ...
}
注意:您可能想使用SQLiteDatabase#query()
而不是行查詢?
2- 將參數workoutName
添加到loadTextView()
,並將其傳遞給getExercises()
:
public void loadTextView(String workoutName){
//code ...
ArrayList<String> exercises = dataHelper.getExercises(workoutName);
//code ...
}
3-通過 Spinner 的setOnItemSelectedListener()
選擇的鍛煉:
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
loadTextView(databaseR.getSelectedItem().toString());
}
現在當 item 被選中時, loadTextView()
被調用,告訴方法選擇了哪個鍛煉,並查詢數據庫以獲取與該鍛煉名稱相關的記錄。
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