我在我的微调器中添加了一个适配器，这是代码：
ArrayAdapter<String> adapter;
adapter = new ArrayAdapter(this,
android.R.layout.simple_spinner_item,
itemList);
我通过以下方式在项目列表中添加了项目：
itemList.add(p.getCourseId()+" "+p.getRoom()+" "+p.getSection());
我的微调器内的数据显示如下： “IT117P R210 A58”，“IT200P R310 A57”，“IT500 3400 A28” 所以数据分别是：课程，房间和部分。 我需要做的是在用户单击微调器项目时仅获取课程字符串（p.getCourseId（））和部分字符串（p.getSection（））（不包括房间）。选择项目后，它将传递另一个类别的数据
这是我在onCreate上的代码：
mySpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
course=mySpinner.getSelectedItem().toString();
//this i think will get all the string item
//in spinner not the course and section only:(
//HOW to get the course and section?
new Thread(new Runnable() {
public void run() {
data = bw.getAttendanceFromDB(term, course,sections);
runOnUiThread(new Runnable() {
@Override
public void run() {
ArrayList<Properties> attendanceusers = attendanceUse(data);
addAttendance(attendanceusers);
}
});
}
}).start();
}
更新：这是我的整个代码，我实现了分割功能：
Courseprof.java
public class Courseprof extends Activity{
String data = "";
TableLayout tl;
TableRow tr;
Button btcourse;
int term=1;
String course="",sections="";
Spinner mySpinner = (Spinner) findViewById(R.id.spincourse);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.courses);
tl = (TableLayout) findViewById(R.id.maintable);
final BackgroundWorker bw = new BackgroundWorker(Courseprof.this,"Courseprof");
Bundle get=getIntent().getExtras();
final int profid=get.getInt("id"); //kunin ni course from fragment
new Thread(new Runnable() {
public void run() {
data = bw.getCourseFromDB(profid);
System.out.println(data);
runOnUiThread(new Runnable() {
@Override
public void run() {
ArrayList<Properties> courseusers = parseJSON(data);
addData(courseusers);
}
});
}
}).start();
mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
String splithis;
String[] splited=mySpinner.getSelectedItem().toString().split(" ");
course = splited[0];
sections = splited[2];
new Thread(new Runnable() {
public void run() {
data = bw.getAttendanceFromDB(term, course,sections);
runOnUiThread(new Runnable() {
@Override
public void run() {
ArrayList<Properties> attendanceusers = attendanceUse(data);
addAttendance(attendanceusers);
}
});
}
}).start();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
return;
}
});
}
public ArrayList<Properties> parseJSON(String result) {
ArrayList<Properties> courseusers = new ArrayList<Properties>();
try {
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
Properties user = new Properties();
user.setRoom(json_data.getString("rooms_id")); //ipinasa dito
user.setCourse(json_data.getString("course_id"));
user.setSection(json_data.getString("sections_id"));
courseusers.add(user);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
return courseusers;
}
public ArrayList<Properties> attendanceUse(String result) {
ArrayList<Properties> attendanceusers = new ArrayList<Properties>();
try {
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
Properties user = new Properties();
user.setStudentfname(json_data.getString("student_fname")); //ipinasa dito
user.setStudentmname(json_data.getString("student_mname"));
user.setStudentlname(json_data.getString("student_lname"));
user.setStatdescript(json_data.getString("status_description"));
attendanceusers.add(user);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
return attendanceusers;
}
@SuppressWarnings({ "rawtypes" })
public void addData(ArrayList<Properties> courseusers) {
List<String> itemList=new ArrayList<String>();
for (Iterator i = courseusers.iterator(); i.hasNext();) {
Properties p = (Properties) i.next();
itemList.add(p.getCourseId()+" "+p.getRoom()+" "+p.getSection());
}
ArrayAdapter<String> adapter;
adapter = new ArrayAdapter(this,
android.R.layout.simple_spinner_item,
itemList);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySpinner.setAdapter(adapter);
}
TextView label;
void addHeaderAttendance(){
/** Create a TableRow dynamically **/
tr = new TableRow(this);
/** Creating a TextView to add to the row **/
label = new TextView(this);
label.setText("Students");
label.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
label.setPadding(5, 5, 5, 5);
label.setBackgroundColor(Color.RED);
LinearLayout Ll = new LinearLayout(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(5, 5, 5, 5);
//Ll.setPadding(10, 5, 5, 5);
Ll.addView(label,params);
tr.addView((View)Ll); // Adding textView to tablerow.
/** Creating Qty Button **/
TextView place = new TextView(this);
place.setText("Status");
place.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
place.setPadding(5, 5, 5, 5);
place.setBackgroundColor(Color.RED);
Ll = new LinearLayout(this);
params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(0, 5, 5, 5);
//Ll.setPadding(10, 5, 5, 5);
Ll.addView(place,params);
tr.addView((View)Ll); // Adding textview to tablerow.
// Add the TableRow to the TableLayout
tl.addView(tr, new TableLayout.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
}
@SuppressWarnings({ "rawtypes" })
public void addAttendance(ArrayList<Properties> attendanceusers) {
addHeaderAttendance();
for (Iterator i = attendanceusers.iterator(); i.hasNext();) {
Properties p = (Properties) i.next();
/** Create a TableRow dynamically **/
tr = new TableRow(this);
/** Creating a TextView to add to the row **/
label = new TextView(this);
label.setText(p.getStudentfname()+" "+p.getStudentlname()+" "+p.getStudentmname());
label.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
label.setPadding(5, 5, 5, 5);
label.setBackgroundColor(Color.GRAY);
LinearLayout Ll = new LinearLayout(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(5, 2, 2, 2);
//Ll.setPadding(10, 5, 5, 5);
Ll.addView(label,params);
tr.addView((View)Ll); // Adding textView to tablerow.
TextView stats = new TextView(this);
stats.setText(p.getStatdescript());
stats.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
stats.setPadding(5, 5, 5, 5);
stats.setBackgroundColor(Color.GRAY);
Ll = new LinearLayout(this);
params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(0, 2, 2, 2);
//Ll.setPadding(10, 5, 5, 5);
Ll.addView(stats,params);
tr.addView((View)Ll); // Adding textview to tablerow.
// Add the TableRow to the TableLayout
tl.addView(tr, new TableLayout.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
}
}
}
这是错误：
11-10 20:36:24.964: E/AndroidRuntime(10862): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{in.wptrafficanalyzer.navigationdrawerdemo/in.wptrafficanalyzer.navigationdrawerdemo.Courseprof}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3132)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.ActivityThread.access$1100(ActivityThread.java:229)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.os.Handler.dispatchMessage(Handler.java:102)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.os.Looper.loop(Looper.java:148)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.ActivityThread.main(ActivityThread.java:7406)
11-10 20:36:24.964: E/AndroidRuntime(10862): at java.lang.reflect.Method.invoke(Native Method)
11-10 20:36:24.964: E/AndroidRuntime(10862): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
11-10 20:36:24.964: E/AndroidRuntime(10862): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
11-10 20:36:24.964: E/AndroidRuntime(10862): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.Activity.findViewById(Activity.java:2316)
11-10 20:36:24.964: E/AndroidRuntime(10862): at in.wptrafficanalyzer.navigationdrawerdemo.Courseprof.<init>(Courseprof.java:35)
11-10 20:36:24.964: E/AndroidRuntime(10862): at java.lang.Class.newInstance(Native Method)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.Instrumentation.newActivity(Instrumentation.java:1096)
11-10 20:36:24.964: E/AndroidRuntime(10862): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3122)
答案 0 :(得分：0)
您可以使用拆分功能
实施例
course=mySpinner.getSelectedItem().toString();
String[] splited = course.split(" ");
String first = splited[0];
String second = splited[1];
String last = splited[2];
您可以将旋转器全局对象设为
private Spinner mySpinner;
在setContentView之后在onCreate（）方法中初始化微调器
mySpinner= (Spinner) findViewById(R.id.spincourse);
答案 1 :(得分：0)
您可以使用空格拆分选定的字符串，以获取值。
String[] data = mySpinner.getSelectedItem().toString().split(" ");
course = data[0];
section = data[2];
答案 2 :(得分：0)
您可以根据空格分割String。
String selectedCource = mySpinner.getSelectedItem().toString();
String[] words = selectedCource.split("\\s");//splits the string based on whitespace
String course = words[0];
String selection = words[2];
答案 3 :(得分：0)
尝试这个，
String[] data = mySpinner.getSelectedItem().toString().split(" ");
course = data[0];
section = data[data.length-1];