我正在尝试以编程方式突出显示列表视图中的所选行。 我有一个简单的测验应用程序，有前一个和下一个按钮。一旦用户选择了一个选项，它就会突出显示，并在按下sqllite数据库中的下一个按钮时保存，并显示一个新问题。 点击上一个按钮，我可以显示上一个问题，并且我能够获得他为该特定问题选择的位置。
问题
我试图以编程方式突出显示所选选项。
注意
如果您不想阅读整个代码，请查看PrevQuestion（）函数
我的代码
public class Aptitude extends Activity implements OnClickListener {
DBHelper helper;
SQLiteDatabase db;
Button btnBegin,btnnext,btnredirect,btnPrev;
int count = 0;
int response = 0;
int Submodules;
int iQuestionNo;
int StudentID = 0;
TextView tvQuestionNoAptitude ,tvTimer, tvOptiontitle;
View previouslySelectedItem = null;
CounterClass timer;
//Sub category Buttons
Button btnaptitude5,btnaptitude4,btnaptitude3,btnaptitude2,btnaptitude1,btnSubmitTest;
String QuestionNo,Title,TitleDescription,QuestionText,QuestionTemplate,QuestionImage,Submodule , QuestionID, stroptiontitle,strOptionResponseID,strStudentIDfromPrevPage ,strselected_StudentID;
//String SubModuleQuestion_ID;
TextView tvTitle,tvInstructions,tvQuestionText;
RadioGroup rgtemplate4images;
ImageView img;
RelativeLayout aptitudesubcateg,temp5optimage, redirecttemplate;
ListView listviewoptions;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.aptitude);
temp5optimage = (RelativeLayout) findViewById(R.id.temp5optimage);
temp5optimage.setClickable(false);
redirecttemplate = (RelativeLayout) findViewById(R.id.redirecttemplateaptitude);
// int position = 1;
listviewoptions = (ListView)findViewById(R.id.lstviewoptionAptitude);
listviewoptions.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,int position ,
long arg3) {
//arg1.setBackgroundColor(getResources().getColor(
// R.color.pressed_color));
if (previouslySelectedItem != null)
{
previouslySelectedItem.setBackgroundColor(Color.TRANSPARENT);
//getResources().getColor(R.color.pressed_color));
}
String Selectedcolor = "#fdc500";
arg1.setBackgroundColor(Color.parseColor(Selectedcolor));
// getResources().getColor(R.color.default_color));
previouslySelectedItem = arg1;
// TODO Auto-generated method stub
// Toast.makeText(getApplicationContext(),String.valueOf(response), Toast. LENGTH_SHORT).show();
response = position+1;
}
});
temp5optimage.setVisibility(View.GONE);
redirecttemplate.setVisibility(View.GONE);
btnredirect = (Button)findViewById(R.id.btnredirect);
btnSubmitTest = (Button)findViewById(R.id.btnSubmitTest);
btnSubmitTest.setOnClickListener(this);
btnredirect.setOnClickListener(this);
helper = new DBHelper(this);
iQuestionNo = 0 ;
Submodules = 0;
//addQuestion();
btnBegin = (Button)findViewById(R.id.btnBeginAptitude);
btnBegin.setOnClickListener(this);
btnnext = (Button)findViewById(R.id.btnNextQues);
btnnext.setOnClickListener(this);
btnPrev = (Button)findViewById(R.id.btnPrevQues);
btnPrev.setOnClickListener(this);
initialize();
}
public void initialize()
{
Bundle extras = getIntent().getExtras();
if (extras != null)
{
strStudentIDfromPrevPage = extras.getString("StudentID");
strselected_StudentID = strStudentIDfromPrevPage;
}
else
{
Toast.makeText(getBaseContext(), "no id found", Toast.LENGTH_LONG).show();
}
}
public int getcount(String moduleID, Integer SubModuleID)
{
count = 0;
String selectQuery = "Select * from AT_QuestionMaster where ModuleID = "+moduleID+" AND SubModuleID ="+SubModuleID;
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
count = cursor.getCount();
// Toast.makeText(this, String.valueOf(count) ,Toast.LENGTH_LONG).show();
cursor.close();
db.close();
return count;
}
private void Getoptions() {
// database handler
DBHelper db = new DBHelper(getApplicationContext());
// Spinner Drop down elements
List<String> options = db.getAllOptions(QuestionID);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, options);
listviewoptions.setAdapter(adapter);
//Toast.makeText(this,"",Toast.LENGTH_LONG).show();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
AlertDialog.Builder alertbox = new AlertDialog.Builder(Aptitude.this);
alertbox.setTitle("Back is not allowed during Assessment. Please Contact Assessor");
alertbox.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// finish used for destroyed activity
// finish();
// exit();
// Toast.makeText(Interest.this, "Back is not ", Toast.LENGTH_LONG).show();
}
});
alertbox.show();
}
return super.onKeyDown(keyCode, event);
}
public void getAllQuestionsAptitude(String moduleID, Integer SubModuleID,String SubModuleQuestion_ID){
SQLiteDatabase db = helper.getReadableDatabase();
Cursor c = null;
if (count>0)
{
// SubModuleQuestion_ID = "1";
String selectQuestion = "Select * from AT_QuestionMaster where ModuleID = "+moduleID+" AND SubModuleID ="+SubModuleID+" AND QuestionSequence ="+SubModuleQuestion_ID;
c = db.rawQuery(selectQuestion, null);
if (c.moveToFirst()) {
do {
QuestionNo = c.getString(c.getColumnIndex("QuestionSequence"));
QuestionID = c.getString(c.getColumnIndex("QuestionNo"));
Title = c.getString(c.getColumnIndex("Title"));
TitleDescription = c.getString(c.getColumnIndex("TitleDescription"));
QuestionText = c.getString(c.getColumnIndex("QuestionText"));
QuestionTemplate = c.getString(c.getColumnIndex("QuestionTemplate"));
QuestionImage = c.getString(c.getColumnIndex("QuestionImage"));
stroptiontitle = c.getString(c.getColumnIndex("Title"));
Getoptions();
} while (c.moveToNext());
}
}
else
{
Toast.makeText(this,"NO question to display",Toast.LENGTH_LONG).show();
}
c.close();
db.close();
}
public void displayquestions()
{
// Toast.makeText(this,"count on display Q is"+ count,Toast.LENGTH_LONG).show();
if (count >0)
{
getAllQuestionsAptitude("3",Submodules,String.valueOf(iQuestionNo));
// aptitudesubcateg.setVisibility(View.GONE);
temp5optimage.setVisibility(View.VISIBLE);
tvTitle = (TextView)findViewById(R.id.tvTitleAptitude);
tvQuestionNoAptitude = (TextView)findViewById(R.id.tvQuestionNoAptitude);
tvInstructions = (TextView)findViewById(R.id.tvInstructionsAptitude);
tvQuestionText = (TextView)findViewById(R.id.tvQuestionAptitude);
tvOptiontitle = (TextView)findViewById(R.id.txtOptionTitle);
tvTimer = (TextView)findViewById(R.id.txtTimerAptitude);
// tvTimer.setText("15:00");
img = (ImageView)findViewById(R.id.imgAptitude);
tvTitle.setText(Title);
tvQuestionNoAptitude.setText(QuestionNo+". ");
// tvInstructions.setText(TitleDescription);
tvOptiontitle.setText(stroptiontitle);
tvQuestionText.setText(QuestionText);
String imgName = QuestionImage; // specify here your image name fetched from db
if (imgName != null)
{
img.setVisibility(View.VISIBLE);
int resourceId = this.getResources().getIdentifier(imgName, "drawable", "com.cldonline.assesmenttool");
img.setImageResource(resourceId);
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)tvOptiontitle.getLayoutParams();
tvOptiontitle.setLayoutParams(params);
RelativeLayout.LayoutParams params1 = (RelativeLayout.LayoutParams)listviewoptions.getLayoutParams();
tvOptiontitle.setLayoutParams(params1);
}
else
{
img.setVisibility(View.GONE);
// RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)tvOptiontitle.getLayoutParams();
// params.setMargins(0, 0, 0, 170); //left, top, right, bottom);
//
// tvOptiontitle.setLayoutParams(params);
//
// RelativeLayout.LayoutParams params1 = (RelativeLayout.LayoutParams)listviewoptions.getLayoutParams();
// params1.setMargins(0, 20, 0, 190); //left, top, right, bottom);
// tvOptiontitle.setLayoutParams(params1);
}
}
else
{
// aptitudesubcateg.setVisibility(View.GONE);
temp5optimage.setVisibility(View.GONE);
redirecttemplate.setVisibility(View.VISIBLE);
// Toast.makeText(this,"NO question to display",Toast.LENGTH_SHORT).show();
Intent i = new Intent(getApplicationContext(),Thankyou.class);
startActivity(i);
overridePendingTransition(R.anim.slide_in,
R.anim.slide_out);
}
if(count == iQuestionNo)
{
btnnext.setEnabled(false);
String selectedColor = "#F5AD82";
btnnext.setBackgroundColor(Color.parseColor(selectedColor));
btnnext.setTextColor(Color.LTGRAY);
}
}
public void NextQuestion()
{
if(response == 0)
{
iQuestionNo++;
response = 0;
displayquestions();
}
//if (count>0 && response > 0)
if (count>=iQuestionNo && response > 0)
{
//count = count - 1;
iQuestionNo++;
saveQuestion();
}
//if (count == 0)
if(count<iQuestionNo)
{
temp5optimage.setVisibility(View.GONE);
redirecttemplate.setVisibility(View.VISIBLE);
}
}
public void getoptionSelected(String StudentIDResponse , String QuestionIDResponse)
{
SQLiteDatabase db = helper.getReadableDatabase();
Cursor c = null;
String selectQuestion = "Select * from TableResponse where StudentID = "+StudentIDResponse+" AND QuestionID ="+QuestionIDResponse;
c = db.rawQuery(selectQuestion, null);
if( c.getCount() >0) {
if (c.moveToFirst()) {
do {
strOptionResponseID = c.getString(c.getColumnIndex("QuestOptionID"));
} while (c.moveToNext());
}
}
else
{
//No response Found
}
}
public void PrevQuestion()
{
getoptionSelected(strselected_StudentID,QuestionID);
//strOptionResponseID
if (strOptionResponseID !=null)
{
int iposition = Integer.parseInt(strOptionResponseID)-1;
Toast.makeText(this,String.valueOf(iposition) ,Toast.LENGTH_LONG).show();
// response = Integer.parseInt(strOptionResponseID);
String Selectedcolor = "#fdc500";
listviewoptions.getChildAt(iposition).setBackgroundColor(Color.parseColor(Selectedcolor));
}
if(response == 0)
{
iQuestionNo--;
response = 0;
displayquestions();
}
//if (count>0 && response > 0)
if (count>=iQuestionNo && response > 0)
{
//count = count - 1;
iQuestionNo--;
saveQuestion();
}
//if (count == 0)
if(count<iQuestionNo)
{
// aptitudesubcateg.setVisibility(View.GONE);
temp5optimage.setVisibility(View.GONE);
redirecttemplate.setVisibility(View.VISIBLE);
// Submodules = Submodules +1;
}
}
public void saveQuestion()
{
if (response != 0)
{
String Selectquery = "Select _id from TableResponse Where StudentID ="+strselected_StudentID+" AND QuestionID ="+QuestionID;
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = db.rawQuery(Selectquery, null);
int count = cursor.getCount();
String strID = "";
if( count >0) {
if (cursor.moveToFirst()) {
do {
strID = cursor.getString(cursor.getColumnIndex("_id"));
} while (cursor.moveToNext());
}
// Toast.makeText(this, String.valueOf(count) ,Toast.LENGTH_LONG).show();
cursor.close();
db.close();
}
if (strID == "")
{
//StudentID = 100;
ContentValues values = new ContentValues();
// values.put(DBHelper.Q_ID, "a");
values.put(DBHelper.StudentID,strselected_StudentID);
values.put(DBHelper.R_QuestionID,QuestionID);
values.put(DBHelper.QuestOptionID,String.valueOf(response));
db = helper.getWritableDatabase();
db.insert(DBHelper.TABLEResponse, null, values);
db.close();
response = 0;
displayquestions();
}
else
{
ContentValues values = new ContentValues();
values.put(DBHelper.QuestOptionID,String.valueOf(response));
db = helper.getWritableDatabase();
db.update(DBHelper.TABLEResponse, values, DBHelper.R_ID + "=?",
new String[] { strID });
db.close();
}
}
else
{
Toast.makeText(this, "Please Select an option",
Toast.LENGTH_LONG).show();
}
}
public class CounterClass extends CountDownTimer {
public CounterClass(long millisInFuture, long countDownInterval)
{
super(millisInFuture, countDownInterval);
}
@Override public void onFinish()
{
tvTimer.setText("Time Up !!");
}
@Override
public void onTick(long millisUntilFinished)
{
tvTimer.setText(""+String.format("%d : %d left",
TimeUnit.MILLISECONDS.toMinutes( millisUntilFinished),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (v==btnBegin)
{
btnBegin.setEnabled(false);
// interestsubcateg.setVisibility(View.VISIBLE);
temp5optimage.setVisibility(View.VISIBLE);
if (Submodules == 0)
{
Submodules = 1;
}
getcount("3", Submodules);
iQuestionNo=1;
displayquestions();
timer = new CounterClass(900000,1000);
// tvTimer.setText("15:00");
// timer.cancel();
tvTimer.setText("15:00");
timer.start();
}
if (v== btnnext)
{
NextQuestion();
}
if (v==btnredirect)
{
// aptitudesubcateg.setVisibility(View.GONE);
temp5optimage.setVisibility(View.VISIBLE);
redirecttemplate.setVisibility(View.GONE);
Submodules = Submodules +1;
getcount("3", Submodules);
//count=getcount("1", Submodules);
iQuestionNo=1;
displayquestions();
timer = new CounterClass(900000,1000);
tvTimer.setText("15:00");
// tvTimer.setText("15:00");
timer.start();
}
if(v== btnPrev)
{
PrevQuestion();
}
if (v==btnSubmitTest)
{
AlertDialog.Builder alertbox = new AlertDialog.Builder(Aptitude.this);
alertbox.setTitle("Do you want to submit the test ?");
alertbox.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// finish used for destroyed activity
temp5optimage.setVisibility(View.GONE);
redirecttemplate.setVisibility(View.VISIBLE);
// timer = new CounterClass(900000,1000);
timer.cancel();
timer.onFinish();
}
});
alertbox.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// Nothing will be happened when clicked on no button
// of Dialog
}
});
alertbox.show();
}
}
}
更新
public void PrevQuestion()
{
getoptionSelected(strselected_StudentID,QuestionID);
//strOptionResponseID
if (strOptionResponseID !=null)
{
int iposition = Integer.parseInt(strOptionResponseID)-1;
String Selectedcolor = "#fdc500";
View v = listviewoptions.getChildAt(1); // your index from DB
v.setBackgroundColor(Color.parseColor(Selectedcolor));
}
答案 0 :(得分：1)
使用状态drawable作为列表项背景。设置state_activated的选定颜色。单击列表视图中的项目时，请调用setActivated（）方法。
答案 1 :(得分：1)
在需要以编程方式显示选择的地方使用此
View v = listView.getChildAt(index); // your index from DB
v.setBackgroundColor(0xFF00FF00); // Any color you want
我在这里回答了类似的问题List selector not working properly
答案 2 :(得分：1)
您的项目背景的可绘制状态可能如下所示：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="@color/grey_07" android:state_activated="true" android:state_focused="false" android:state_pressed="false"/>
<item
android:drawable="@color/black_alpha_08" android:state_activated="true" android:state_focused="false" android:state_pressed="true"/>
<item
android:drawable="@color/orange_alpha_30" android:state_activated="true" android:state_focused="true" android:state_pressed="false"/>
<item
android:drawable="@android:color/transparent" android:state_enabled="true" android:state_window_focused="false"/>
<item android:drawable="@color/black_alpha_08" android:state_pressed="true"/>
<item
android:drawable="@color/orange_alpha_30" android:state_enabled="true" android:state_focused="true"/>
<item
android:drawable="@android:color/transparent" android:state_enabled="true"/>
<item
android:drawable="@color/orange_alpha_30" android:state_focused="true"/>
<item android:drawable="@android:color/transparent"/>
</selector>
在你的代码中，你触发了一个项目被点击的地方，可能是onclicklistener或onitemclicklistener，在视图上调用以下方法：
yourClickedView.setActivated(true);
希望这有帮助。