Java Android:使用itemOnSelected微调器中的行结果(sqlite)填充TextView
我想使用微调器作为菜单来选择训练的名称,选择后,Java Android:使用itemOnSelected微调器中的行结果(sqlite)填充TextView,java,android,sqlite,textview,spinner,Java,Android,Sqlite,Textview,Spinner,我想使用微调器作为菜单来选择训练的名称,选择后,TextViews(x4)将填充与该名称相关的练习。 目前,微调器加载训练名称,并已将第一个训练加载到每个TextView的onCreation 启动应用程序时没有错误,但选择新训练名称时,其他行不会加载到文本视图中。。人们只能假设我在逻辑上犯了错误 问题:如果这是逻辑上的错误,有人能识别它并给我指出方向吗 begin.java protected void onCreate(Bundle savedInstanceState) {
TextView
s(x4)将填充与该名称相关的练习。
目前,微调器加载训练名称,并已将第一个训练加载到每个TextView
的onCreation
启动应用程序时没有错误,但选择新训练名称时,其他行不会加载到文本视图中。。人们只能假设我在逻辑上犯了错误
问题:如果这是逻辑上的错误,有人能识别它并给我指出方向吗
begin.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) {
}
});
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_begin);
加载SpinnerData();
刷新文本视图();
}
公共void loadTextView(){
DataHelper DataHelper=新的DataHelper(此);
ArrayList 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(){
微调器数据库=(微调器)findViewById(R.id.databaseR);
databaseR.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
loadTextView();
}
@凌驾
未选择公共无效(AdapterView父级){
}
});
DataHelper.java
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;
}
公共字符串Create\u ex=“Create TABLE ExerciserEasy”
+(ID整数主键自动递增,训练VARCHAR,练习一VARCHAR,)
+“ExerciseTwo VARCHAR,ExerciseThree VARCHAR,ExerciseFour VARCHAR);”
公共ArrayList getExercises(){
ArrayList=新建ArrayList();
SQLiteDatabase db=this.getReadableDatabase();
db.beginTransaction();
试一试{
String selectQuery=“Select*from”+表\u ex1;
Cursor Cursor=db.rawQuery(selectQuery,null);
if(cursor.moveToFirst()){
做{
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();
}捕获(例外e){
e、 printStackTrace();
}最后{
db.endTransaction();
db.close();
}
退货清单;
}
首先,您需要将所选训练名称传递给
loadTextView()
,以便将其传递给GetExchanges()
并根据该名称查询数据库,其他代码看起来不错
1-将参数workoutName
添加到getExercises()
,并在WHERE
子句中使用它
public ArrayList<String> getExercises(String workoutName){
//codes ...
String selectQuery = " Select * from " + Table_ex1 + " WHERE Workout ='" workoutName + "'";
//codes ...
}
3-通过spinner的setOnItemSelectedListener()
中选择的训练:
@覆盖
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
loadTextView(databaseR.getSelectedItem().toString());
}
现在,当选择项时,
loadTextView()调用
,告诉方法选择了哪个训练,并查询数据库以获取与该训练名称相关的记录。请显示您的微调器和选定的代码。您总是只将前4个练习加载到textview中。您的textview显示的数据正确吗?微调器中现在有任何项目吗?
public void loadTextView(String workoutName){
//code ...
ArrayList<String> exercises = dataHelper.getExercises(workoutName);
//code ...
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
loadTextView(databaseR.getSelectedItem().toString());
}