我正在尝试构建一个 Android 应用程序，但我正在努力完成测验模块。所以在这个模块中，我需要为问题（简单、中等和困难）插入难度设置。对于我的第一个 XML 布局，我将方法设置为返回难度设置。
/**
* Method to return the difficulty settings
* @return
*/
private int getDifficultySettings() {
SharedPreferences settings = getSharedPreferences(Constants.SETTINGS, 0);
int diff = settings.getInt(Constants.DIFFICULTY, Constants.MEDIUM);
return diff;
对于另一个显示难度设置的布局。
/**
* Method to update default check box
*/
private void updateButtonWithPreferences() {
RadioButton c1 = (RadioButton)findViewById(R.id.easySetting);
RadioButton c2 = (RadioButton)findViewById(R.id.mediumSetting);
RadioButton c3 = (RadioButton)findViewById(R.id.hardSetting);
SharedPreferences settings = getSharedPreferences(Constants.SETTINGS, 0);
int diff = settings.getInt(Constants.DIFFICULTY, Constants.MEDIUM);
switch (diff)
{
case Constants.EASY :
c1.toggle();
break;
case Constants.MEDIUM :
c2.toggle();
break;
case Constants.HARD :
c3.toggle();
break;
}
}
问题是当我选择中等设置时，我只能从数据库中检索问题。各位Android专家能给我一些建议吗？谢谢你。:)
对于困难的java代码： -
public class SettingsActivity extends Activity implements OnClickListener{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
Button updateBtn = (Button) findViewById(R.id.nextBtn);
updateBtn.setOnClickListener(this);
updateButtonWithPreferences();
}
private void updateButtonWithPreferences() {
RadioButton c1 = (RadioButton)findViewById(R.id.easySetting);
RadioButton c2 = (RadioButton)findViewById(R.id.mediumSetting);
RadioButton c3 = (RadioButton)findViewById(R.id.hardSetting);
SharedPreferences settings = getSharedPreferences(Constants.SETTINGS, 0);
int diff = settings.getInt(Constants.DIFFICULTY, Constants.MEDIUM);
switch (diff)
{
case Constants.EASY :
c1.toggle();
break;
case Constants.MEDIUM :
c2.toggle();
break;
case Constants.EXTREME :
c3.toggle();
break;
}
}
@Override
public void onClick(View arg0) {
if (!checkSelected())
{
return;
}
else
{
SharedPreferences settings = getSharedPreferences(Constants.SETTINGS, 0);
Editor e = settings.edit();
e.putInt(Constants.DIFFICULTY, getSelectedSetting());
e.commit();
finish();
}
}
private boolean checkSelected() {
RadioButton c1 = (RadioButton)findViewById(R.id.easySetting);
RadioButton c2 = (RadioButton)findViewById(R.id.mediumSetting);
RadioButton c3 = (RadioButton)findViewById(R.id.hardSetting);
return (c1.isChecked() || c2.isChecked() || c3.isChecked());
}
private int getSelectedSetting() {
RadioButton c1 = (RadioButton)findViewById(R.id.easySetting);
RadioButton c2 = (RadioButton)findViewById(R.id.mediumSetting);
if (c1.isChecked())
{
return Constants.EASY;
}
if (c2.isChecked())
{
return Constants.MEDIUM;
}
return Constants.EXTREME;
}
}
对于数据库 java 代码：-
public class DBHelper extends SQLiteOpenHelper{
private static String DB_PATH = "/data/data/com.tmm.android.chuck/databases/";
private static String DB_NAME = "questionsDb";
private SQLiteDatabase myDataBase;
private final Context myContext;
public DBHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(!dbExist)
{
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException{
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public List<Question> getQuestionSet(int difficulty, int numQ){
List<Question> questionSet = new ArrayList<Question>();
Cursor c = myDataBase.rawQuery("SELECT * FROM QUESTIONS WHERE DIFFICULTY=" + difficulty +
" ORDER BY RANDOM() LIMIT " + numQ, null);
while (c.moveToNext()){
Question q = new Question();
q.setQuestion(c.getString(1));
q.setAnswer(c.getString(2));
q.setOption1(c.getString(3));
q.setOption2(c.getString(4));
q.setOption3(c.getString(5));
q.setRating(difficulty);
questionSet.add(q);
}
return questionSet;
}
}
此代码用于我的第一个 XML 布局。所以方法 getQuestionSet() 来自这里。
public class SplashActivity extends Activity implements OnClickListener{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
Button playBtn = (Button) findViewById(R.id.playBtn);
playBtn.setOnClickListener(this);
Button settingsBtn = (Button) findViewById(R.id.settingsBtn);
settingsBtn.setOnClickListener(this);
Button rulesBtn = (Button) findViewById(R.id.rulesBtn);
rulesBtn.setOnClickListener(this);
Button exitBtn = (Button) findViewById(R.id.exitBtn);
exitBtn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Intent i;
switch (v.getId()){
case R.id.playBtn :
List<Question> questions = getQuestionSetFromDb();
GamePlay c = new GamePlay();
c.setQuestions(questions);
c.setNumRounds(getNumQuestions());
((ChuckApplication)getApplication()).setCurrentGame(c);
i = new Intent(this, QuestionActivity.class);
startActivityForResult(i, Constants.PLAYBUTTON);
break;
case R.id.rulesBtn :
i = new Intent(this, RulesActivity.class);
startActivityForResult(i, Constants.RULESBUTTON);
break;
case R.id.settingsBtn :
i = new Intent(this, SettingsActivity.class);
startActivityForResult(i, Constants.SETTINGSBUTTON);
break;
case R.id.exitBtn :
finish();
break;
}
}
private List<Question> getQuestionSetFromDb() throws Error {
int diff = getDifficultySettings();
int numQuestions = getNumQuestions();
DBHelper myDbHelper = new DBHelper(this);
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
List<Question> questions = myDbHelper.getQuestionSet(diff, numQuestions);
myDbHelper.close();
return questions;
}
private int getDifficultySettings() {
SharedPreferences settings = getSharedPreferences(Constants.SETTINGS, 0);
int diff = settings.getInt(Constants.DIFFICULTY, Constants.MEDIUM);
return diff;
}
private int getNumQuestions() {
SharedPreferences settings = getSharedPreferences(Constants.SETTINGS, 0);
int numRounds = settings.getInt(Constants.NUM_ROUNDS, 20);
return numRounds;
}
}