大家好我想隐藏按钮如果按钮文字为空，我怎么能这样做？例如，我有测验应用程序和一些问题没有4个答案，如果我有问题，3回答一个按钮总是显示没有文字。抱歉我的英语不好。
我的按钮代码就是这个......
public class ExamActivity extends Fragment implements OnClickListener{
private static int levelNo=1;
private PlayQuizLevel level;
private int quextionIndex=0;
private boolean isSoundEffect;
private boolean isVibration;
private int NO_OF_QUESTION = 10;
private int totalScore=0;
private int score=0;
private int correctQuestion=0;
private int inCorrectQuestion=0;
private ImageView imgQuestion;
private Button btnOpt1, btnOpt2, btnOpt3, btnOpt4;
private TextView txtQuestionIndex, txtScore, txtLevel, txtQuestion;
private SharedPreferences settings;
boolean isSoundOn=false;
private Animation animation;
private MediaPlayer rightAnsware, wrongeAnsware;
private TextView txtTrueQuestion, txtFalseQuestion;
private final Handler mHandler = new Handler();
private SharedPreferences.Editor editor;
private View v;
Animation animationFromRight,animationFromLeft;
private InterstitialAd interstitial;
private List<PlayQuizQuestion> playQuizquestions =null;
private ProgressDialog progress;
String questionJson = "";
private ScrollView scrollView;
private Chronometer crono;
public interface Listener {
public void displyHomeScreen();
public GameData getGameData();
public ExamCompletedActivity getQuizCompletedFragment();
}
Listener mListener = null;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
v = inflater.inflate(R.layout.fragment_quiz_play, container, false);
final int[] CLICKABLES = new int[] {
R.id.btnOpt1, R.id.btnOpt2,
R.id.btnOpt3,R.id.btnOpt4
};
for (int i : CLICKABLES) {
v.findViewById(i).setOnClickListener(this);
}
settings = getActivity().getSharedPreferences(MenuHomeScreenActivity.PREFS_NAME, 0);
resetAllValue();
// Create an ad request. Check logcat output for the hashed device ID to get test ads on a physical device.
// Create ad request.
Resources ress = getResources();
boolean isTestMode = ress.getBoolean(R.bool.istestmode);
AdRequest adRequest =null;
if(isTestMode){
// Request for Ads
System.out.println("Testing.... app");
adRequest = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.addTestDevice("B15149A4EC1ED23173A27B04134DD483")
.addTestDevice("445AAA22783F2ED51E278767315DBDD5")
.addTestDevice("A815D443EF9A92B3EF35A025747A4F16")
.build();
}else{
System.out.println("Live Apps");
adRequest = new AdRequest.Builder().build();
}
// Create the interstitial.
interstitial = new InterstitialAd(getActivity());
interstitial.setAdUnitId(getString(R.string.admob_intersitital));
// Begin loading your interstitial.
interstitial.loadAd(adRequest);
return v;
}
public void setListener(Listener l) {
mListener = l;
}
@Override
public void onStart() {
super.onStart();
updateUi();
}
@Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
updateUi();
}
void updateUi() {
if (getActivity() == null) return;
getActivity().findViewById(R.id.linearLayout1).setVisibility(View.GONE);
}
private void nextQuizQuestion(){
scrollView.post(new Runnable() {
@Override
public void run() {
scrollView.fullScroll(ScrollView.FOCUS_UP);
}
});
int count_question_completed = mListener.getGameData().getCountHowManyQuestionCompleted();
count_question_completed++;
mListener.getGameData().setCountHowManyQuestionCompleted(count_question_completed);
if(quextionIndex>=NO_OF_QUESTION){
int howManyTimesPlayQuiz = mListener.getGameData().getCountHowManyTimePlay();
System.out.println("How Many Time Play: "+howManyTimesPlayQuiz);
howManyTimesPlayQuiz++;
mListener.getGameData().setCountHowManyTimePlay(howManyTimesPlayQuiz);
count_question_completed = mListener.getGameData().getCountHowManyQuestionCompleted();
count_question_completed--;
mListener.getGameData().setCountHowManyQuestionCompleted(count_question_completed);
saveScore();
displayInterstitial();
getActivity().getSupportFragmentManager().popBackStack();
getActivity().getSupportFragmentManager().beginTransaction().replace( R.id.fragment_container, mListener.getQuizCompletedFragment() ).addToBackStack( "tag" ).commit();
blankAllValue();
return;
}
btnOpt1.setClickable(true);
btnOpt2.setClickable(true);
btnOpt3.setClickable(true);
btnOpt4.setClickable(true);
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
if(quextionIndex-1<level.getNoOfQuestion()){
int temp = quextionIndex;
txtQuestionIndex.setText(""+ ++temp+"/"+NO_OF_QUESTION);
String imgName = level.getQuestion().get(quextionIndex).getQuestion();
Pattern p = Pattern.compile(" ");
Matcher m = p.matcher(imgName);
imgName = m.replaceAll("_");
txtQuestion.setText(level.getQuestion().get(quextionIndex).getQuestion());
ArrayList<String> options = new ArrayList<String>();
options.addAll(level.getQuestion().get(quextionIndex).getOptions());
Collections.shuffle(options);
btnOpt1.setText(""+options.get(0).trim());
btnOpt2.setText(""+options.get(1).trim());
btnOpt3.setText(""+options.get(2).trim());
btnOpt4.setText(""+options.get(3).trim());
imgQuestion.setImageBitmap(level.getQuestion().get(quextionIndex).getQuestionBitmap());
}if(quextionIndex==level.getNoOfQuestion()){
System.out.println("only 1 quetion...");
}
}
// Invoke displayInterstitial() when you are ready to display an interstitial.
public void displayInterstitial() {
if (interstitial.isLoaded()) {
interstitial.show();
}
}
@Override
public void onClick(View v) {
if(quextionIndex<level.getNoOfQuestion()){
btnOpt1.setClickable(false);
btnOpt2.setClickable(false);
btnOpt3.setClickable(false);
btnOpt4.setClickable(false);
switch(v.getId()){
case R.id.btnOpt1:
if(btnOpt1.getText().toString().trim().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns().trim())){
quextionIndex++;
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
addScore();
btnOpt1.setBackgroundResource(R.drawable.button_green);
btnOpt1.startAnimation(animation);
btnOpt1.setTextColor(getResources().getColor(R.color.White));
}else{
btnOpt1.setBackgroundResource(R.drawable.button_red);
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
wrongeQuestion();
quextionIndex++;
}
break;
case R.id.btnOpt2:
if(btnOpt2.getText().toString().trim().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns().trim())){
quextionIndex++;
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
addScore();
btnOpt2.setBackgroundResource(R.drawable.button_green);
btnOpt2.startAnimation(animation);
btnOpt2.setTextColor(getResources().getColor(R.color.White));
}else{
btnOpt2.setBackgroundResource(R.drawable.button_red);
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
wrongeQuestion();
quextionIndex++;
}
break;
case R.id.btnOpt3:
if(btnOpt3.getText().toString().trim().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns().trim())){
quextionIndex++;
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
addScore();
btnOpt3.setBackgroundResource(R.drawable.button_green);
btnOpt3.startAnimation(animation);
btnOpt3.setTextColor(getResources().getColor(R.color.White));
}else{
btnOpt3.setBackgroundResource(R.drawable.button_red);
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
wrongeQuestion();
quextionIndex++;
}
break;
case R.id.btnOpt4:
if(btnOpt4.getText().toString().trim().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns().trim())){
quextionIndex++;
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt4.setTextColor(getResources().getColor(R.color.White));
addScore();
btnOpt4.setBackgroundResource(R.drawable.button_green);
btnOpt4.startAnimation(animation);
btnOpt4.setTextColor(getResources().getColor(R.color.White));
}else{
btnOpt4.setBackgroundResource(R.drawable.button_red);
btnOpt4.setTextColor(getResources().getColor(R.color.White));
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt3.setTextColor(getResources().getColor(R.color.White));
wrongeQuestion();
quextionIndex++;
}
break;
}
}else{
mHandler.postDelayed(mUpdateUITimerTask, 2 * 10);
}
mHandler.postDelayed(mUpdateUITimerTask, 2 * 1000);
txtScore.setText(""+totalScore);
}
private final Runnable mUpdateUITimerTask = new Runnable() {
public void run() {
btnOpt1.setBackgroundResource(R.drawable.button_white);
btnOpt2.setBackgroundResource(R.drawable.button_white);
btnOpt3.setBackgroundResource(R.drawable.button_white);
btnOpt4.setBackgroundResource(R.drawable.button_white);
btnOpt1.clearAnimation();
btnOpt2.clearAnimation();
btnOpt3.clearAnimation();
btnOpt4.clearAnimation();
nextQuizQuestion();
}
};
private void addScore(){
rightSound();
correctQuestion++;
txtTrueQuestion.setText(" "+correctQuestion +" ");
totalScore = totalScore + 10;
score = score + 10;
txtScore.setText(" "+totalScore+" ");
int rightAns = mListener.getGameData().getCountHowManyRightAnswareQuestion();
rightAns++;
mListener.getGameData().setCountHowManyRightAnswareQuestion(rightAns);
mListener.getGameData().setTotalScore(totalScore);
mListener.getGameData().saveDataLocal(settings);
System.out.println("Right Answare: "+ mListener.getGameData().getCountHowManyRightAnswareQuestion());
}
private void wrongeQuestion(){
playWrongSound();
//saveScore();
inCorrectQuestion++;
totalScore = totalScore - 3;
score = score - 3;
txtFalseQuestion.setText(" "+ inCorrectQuestion +" ");
if(btnOpt1.getText().toString().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns())){
btnOpt1.setBackgroundResource(R.drawable.button_green);
btnOpt1.setTextColor(getResources().getColor(R.color.White));
btnOpt1.startAnimation(animation);
}
if(btnOpt2.getText().toString().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns())){
btnOpt2.setBackgroundResource(R.drawable.button_green);
btnOpt2.setTextColor(getResources().getColor(R.color.White));
btnOpt2.startAnimation(animation);
}
if(btnOpt3.getText().toString().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns())){
btnOpt3.setBackgroundResource(R.drawable.button_green);
btnOpt3.setTextColor(getResources().getColor(R.color.White));
btnOpt3.startAnimation(animation);
}
if(btnOpt4.getText().toString().equalsIgnoreCase(level.getQuestion().get(quextionIndex).getTrueAns())){
btnOpt4.setBackgroundResource(R.drawable.button_green);
btnOpt4.setTextColor(getResources().getColor(R.color.White));
btnOpt4.startAnimation(animation);
}
if(totalScore<0){
totalScore=0;
}
}
private void saveScore(){
editor = settings.edit();
mListener.getGameData().setTotalScore(totalScore);
//editor.putInt(MenuHomeScreenActivity.TOTAL_SCORE, totalScore);
editor.putInt(MenuHomeScreenActivity.LAST_LEVEL_SCORE, score);
if(correctQuestion>=7){
//unlockLevelCompletedAchivement(levelNo);
levelNo++;
editor.putBoolean(MenuHomeScreenActivity.IS_LAST_LEVEL_COMPLETED, true);
mListener.getGameData().setLevelCompleted(levelNo);
}else{
editor.putBoolean(MenuHomeScreenActivity.IS_LAST_LEVEL_COMPLETED, false);
}
mListener.getGameData().saveDataLocal(settings);
editor.commit();
}
public void rightSound()
{
if(isSoundEffect){
AudioManager meng = (AudioManager) getActivity().getSystemService(Context.AUDIO_SERVICE);
int volume = meng.getStreamVolume( AudioManager.STREAM_NOTIFICATION);
if (volume != 0)
{
if (rightAnsware == null)
rightAnsware = MediaPlayer.create(getActivity(), R.raw.right_ans);
if (rightAnsware != null)
rightAnsware.start();
}
}
}
private void playWrongSound(){
if(isSoundEffect){
AudioManager meng = (AudioManager) getActivity().getSystemService(Context.AUDIO_SERVICE);
int volume = meng.getStreamVolume( AudioManager.STREAM_NOTIFICATION);
if (volume != 0)
{
if (wrongeAnsware == null)
wrongeAnsware = MediaPlayer.create(getActivity(), R.raw.wronge_ans);
if (wrongeAnsware != null)
wrongeAnsware.start();
}
}
if(isVibration){
Vibrator myVib = (Vibrator) getActivity().getSystemService(getActivity().VIBRATOR_SERVICE);
myVib.vibrate(200);
}
}
private void resetAllValue(){
isSoundOn = settings.getBoolean("silentMode", true);
levelNo = mListener.getGameData().getLevelCompleted();
scrollView = (ScrollView)v.findViewById(R.id.scrollView);
txtQuestionIndex = (TextView)v.findViewById(R.id.txt_question);
txtLevel = (TextView)v.findViewById(R.id.txtLevel);
txtLevel.setText(getString(R.string.level)+": "+levelNo);
btnOpt1 = (Button)v.findViewById(R.id.btnOpt1);
btnOpt2 = (Button)v.findViewById(R.id.btnOpt2);
btnOpt3 = (Button)v.findViewById(R.id.btnOpt3);
btnOpt3.setOnClickListener(this);
btnOpt4 = (Button)v.findViewById(R.id.btnOpt4);
btnOpt4.setOnClickListener(this);
btnOpt1.setBackgroundResource(R.drawable.button_white);
btnOpt2.setBackgroundResource(R.drawable.button_white);
btnOpt3.setBackgroundResource(R.drawable.button_white);
btnOpt4.setBackgroundResource(R.drawable.button_white);
txtTrueQuestion = (TextView)v.findViewById(R.id.txtTrueQuestion);
txtTrueQuestion.setText("0");
txtFalseQuestion = (TextView)v.findViewById(R.id.txtFalseQuestion);
txtFalseQuestion.setText("0");
txtQuestion = (TextView)v.findViewById(R.id.txtQuestion);
imgQuestion = (ImageView)v.findViewById(R.id.imgQuestion);
animation = new AlphaAnimation(1, 0); // Change alpha from fully visible to invisible
animation.setDuration(500); // duration - half a second
animation.setInterpolator(new LinearInterpolator()); // do not alter animation rate
animation.setRepeatCount(Animation.INFINITE); // Repeat animation infinitely
animation.setRepeatMode(Animation.REVERSE); // Reverse animation at the end so the button will fade back in
animationFromRight = new TranslateAnimation(500f, 0f, 0f, 0f);
animationFromRight.setDuration(600);
animationFromLeft = new TranslateAnimation(-500f, 0f, 0f, 0f);
animationFromLeft.setDuration(600);
animationFromRight = new TranslateAnimation(500f, 0f, 0f, 0f);
animationFromRight.setDuration(600);
animationFromLeft = new TranslateAnimation(-500f, 0f, 0f, 0f);
animationFromLeft.setDuration(600);
isSoundEffect = settings.getBoolean(MenuHomeScreenActivity.SOUND_EFFECT, true);
isVibration = settings.getBoolean(MenuHomeScreenActivity.VIBRATION, true);
totalScore = mListener.getGameData().getTotalScore();
txtScore = (TextView)v.findViewById(R.id.txtScore);
txtScore.setText(""+totalScore);
Resources ress = getResources();
progress = new ProgressDialog(getActivity());
progress.setTitle("Подождите");
progress.setMessage("Загрузка данных");
progress.setCancelable(false);
progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progress.show();
LoadQuestions task = new LoadQuestions();
task.execute(new String[] { ress.getString(R.string.question_bank_url)+levelNo });
}
public void blankAllValue() {
quextionIndex = 0;
isSoundEffect = false;
isVibration = false;
totalScore = 0;
score = 0;
correctQuestion = 0;
inCorrectQuestion = 0;
}
private class LoadQuestions extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
questionJson="";
for (String url : urls) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse execute = client.execute(httpGet);
InputStream content = execute.getEntity().getContent();
BufferedReader buffer = new BufferedReader(new InputStreamReader(content));
String s = "";
while ((s = buffer.readLine()) != null) {
questionJson += s;
}
} catch (Exception e) {
e.printStackTrace();
}
try {
playQuizquestions = new ArrayList<PlayQuizQuestion>();
JSONArray users = new JSONArray(questionJson);
for (int i = 0; i < users.length(); i++) {
JSONObject c = users.getJSONObject(i);
PlayQuizQuestion tempQuestion = new PlayQuizQuestion(c.getString("question"));
tempQuestion.addOption(c.getString("optiona"));
tempQuestion.addOption(c.getString("optionb"));
tempQuestion.addOption(c.getString("optionc"));
tempQuestion.addOption(c.getString("optiond"));
String temImgName = c.getString("qimage").replace(" ", "%20");//%20
String imageName = ""+getResources().getString(R.string.question_image_path)+"/"+temImgName;
tempQuestion.setImagePath(imageName);
String rightAns = c.getString("rightans");
if(rightAns.equalsIgnoreCase("A")){
tempQuestion.setTrueAns(c.getString("optiona"));
}else if(rightAns.equalsIgnoreCase("B")){
tempQuestion.setTrueAns(c.getString("optionb"));
}else if(rightAns.equalsIgnoreCase("C")){
tempQuestion.setTrueAns(c.getString("optionc"));
}else{
tempQuestion.setTrueAns(c.getString("optiond"));
}
try {
tempQuestion.setQuestionBitmap(BitmapFactory.decodeStream((InputStream)new URL(imageName).getContent()));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(tempQuestion);
playQuizquestions.add(tempQuestion);
}
level = new PlayQuizLevel(levelNo,NO_OF_QUESTION,getActivity());
Collections.shuffle(playQuizquestions);
level.setQuestion(playQuizquestions);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data" + e.toString());
e.printStackTrace();
}
}
return questionJson;
}
@Override
protected void onPostExecute(String result) {
progress.cancel();
nextQuizQuestion();
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}
}
}
答案 0 :(得分：1)
检查选项是否为空并基于它隐藏/显示。
if(options.get(i).trim().isEmpty()){
btnOpt{i}.setVisibility(View.GONE);
}
else
{
btnOpt{i}.setVisibility(View.VISIBLE);
}