請給我一些解決競猜應用如何添加後退按鈕在測驗應用程序?
我想製作的是回到我的測驗應用程序按鈕,問題來自數據庫添加後退按鈕。我想按鈕轉到前面的問題不搞亂up.I是新到Android任何一個可以幫助我解決這個問題..
package in.gtarena.myquizapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import in.gtarena.myquizapp.db.DBAdapter;
import in.gtarena.myquizapp.model.Question;
public class ComputerActivity extends AppCompatActivity {
private List<Question> questionsList;
private Question currentQuestion;
private TextView txtQuestion,tvNoOfQs;
private RadioButton rbtnA, rbtnB, rbtnC,rbtnD;
private Button btnNext,btnBack;
private RadioGroup grp;
private int obtainedScore=0;
private int questionId=0;
private int answeredQsNo=0;
ArrayList<String> myAnsList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_concept);
init();
btnBack = (Button) findViewById(R.id.btnBack);
grp=(RadioGroup)findViewById(R.id.radioGroup1);
//Initialize the database
final DBAdapter dbAdapter =new DBAdapter(this);
questionsList= dbAdapter.getQuestions();
currentQuestion =questionsList.get(questionId);
//Set question
setQuestionsView();
//Check and Next
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
RadioButton answer=(RadioButton)findViewById(grp.getCheckedRadioButtonId());
Log.e("Answer ID", "Selected Positioned value - "+grp.getCheckedRadioButtonId());
if(answer!=null){
Log.e("Answer", currentQuestion.getANSWER() + " -- " + answer.getText());
//Add answer to the list
myAnsList.add(""+answer.getText());
if(currentQuestion.getANSWER().equals(answer.getText())){
obtainedScore++;
Log.e("comments", "Correct Answer");
Log.d("score", "Obtained score " + obtainedScore);
}else{
Log.e("comments", "Wrong Answer");
}
if(questionId < dbAdapter.rowCount()){
currentQuestion =questionsList.get(questionId);
setQuestionsView();
}else{
Intent intent = new Intent(ComputerActivity.this, ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", obtainedScore);
b.putInt("totalQs", questionsList.size());
b.putStringArrayList("myAnsList", myAnsList);
intent.putExtras(b);
startActivity(intent);
finish();
}
}else{
Log.e("comments", "No Answer");
}
//Need to clear the checked item id
grp.clearCheck();
}//end onClick Method
});
//Check and Back
btnBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//WHAT SHOULD I DO HERE FOR GO BACK TO PREVIOUS QUESTION//
}
});
}
public void init(){
tvNoOfQs=(TextView)findViewById(R.id.tvNumberOfQuestions);
txtQuestion=(TextView)findViewById(R.id.tvQuestion);
rbtnA=(RadioButton)findViewById(R.id.radio0);
rbtnB=(RadioButton)findViewById(R.id.radio1);
rbtnC=(RadioButton)findViewById(R.id.radio2);
rbtnD=(RadioButton)findViewById(R.id.radio3);
btnNext=(Button)findViewById(R.id.btnNext);
myAnsList = new ArrayList<String>();
}
private void setQuestionsView()
{
rbtnA.setChecked(false);
rbtnB.setChecked(false);
rbtnC.setChecked(false);
rbtnD.setChecked(false);
answeredQsNo=questionId+1;
tvNoOfQs.setText("Questions "+answeredQsNo+" of "+questionsList.size());
txtQuestion.setText(currentQuestion.getQUESTION());
rbtnA.setText(currentQuestion.getOptionA());
rbtnB.setText(currentQuestion.getOptionB());
rbtnC.setText(currentQuestion.getOptionC());
rbtnD.setText(currentQuestion.getOptionD());
questionId++;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
我無法通過整個代碼,你使用的片段顯示疑問或viewpagers? –
片段用於我的代碼 –
歡迎使用StackoverFlow。你可能要考慮讀命名頁:[問],然後用它的信息,使你的問題了一些有用的改變。有很多有用的信息,指南中,值得花幾分鐘閱讀全部。指南: - > [ask] < - – mike510a