Java 如何将另一个按钮添加到预先制作的android程序(android Studio)
我正在使用这个,但我想让每个问题有4个选项。我还把问题减少到5个。有人能帮忙吗?这是修改后的代码。但它不会运行:( QuizActivity.javaJava 如何将另一个按钮添加到预先制作的android程序(android Studio),java,android,Java,Android,我正在使用这个,但我想让每个问题有4个选项。我还把问题减少到5个。有人能帮忙吗?这是修改后的代码。但它不会运行:( QuizActivity.java public class QuestionActivity extends Activity { List<Question> quesList; int score = 0; int qid = 0; Question currentQ; TextView txtQuestion, times
public class QuestionActivity extends Activity {
List<Question> quesList;
int score = 0;
int qid = 0;
Question currentQ;
TextView txtQuestion, times, scored;
Button button1, button2, button3, button4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
QuizHelper db = new QuizHelper(this);
quesList = db.getAllQuestions();
currentQ = quesList.get(qid);
txtQuestion = (TextView) findViewById(R.id.txtQuestion);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button3 = (Button) findViewById(R.id.button3);
button4 = (Button) findViewById(R.id.button4);
scored = (TextView) findViewById(R.id.score);
times = (TextView) findViewById(R.id.timers);
setQuestionView();
times.setText("00:02:00");
CounterClass timer = new CounterClass(60000, 1000);
timer.start();
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button1.getText().toString());
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button2.getText().toString());
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button3.getText().toString());
}
});
button4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button4.getText().toString());
}
});
}
public void getAnswer(String AnswerString) {
if (currentQ.getANSWER().equals(AnswerString)) {
score++;
scored.setText("Score : " + score);
} else {
Intent intent = new Intent(QuestionActivity.this,
ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}
if (qid < 4) {
currentQ = quesList.get(qid);
setQuestionView();
} else {
Intent intent = new Intent(QuestionActivity.this,
ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}
}
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@SuppressLint("NewApi")
public class CounterClass extends CountDownTimer {
public CounterClass(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
@Override
public void onFinish() {
times.setText("Time is up");
}
@Override
public void onTick(long millisUntilFinished) {
long millis = millisUntilFinished;
String hms = String.format(
"%02d:%02d:%02d",
TimeUnit.MILLISECONDS.toHours(millis),
TimeUnit.MILLISECONDS.toMinutes(millis)
- TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS
.toHours(millis)),
TimeUnit.MILLISECONDS.toSeconds(millis)
- TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS
.toMinutes(millis)));
System.out.println(hms);
times.setText(hms);
}
}
private void setQuestionView() {
txtQuestion.setText(currentQ.getQUESTION());
button1.setText(currentQ.getOPTA());
button2.setText(currentQ.getOPTB());
button3.setText(currentQ.getOPTC());
button4.setText(currentQ.getOPTD());
qid++;
}
}
然后,对于activity_main.xml,我添加了一个id为button4的android按钮
<Button
android:id="@+id/button4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:layout_marginTop="5dp"
android:background="#fff"
android:gravity="center"
android:text="31"
android:textColor="#000000"
android:textSize="25.0sp" />
在表创建sql中,KEY\u OPTC
后面缺少一个逗号
在表创建sql中,
KEY\u OPTC
之后缺少了一个逗号。您说它没有运行。您可能会遇到编译错误,或者在某个时候出现堆栈跟踪。请编辑您的问题以包含编译错误或堆栈跟踪。尝试只发布代码的重要部分。logcat会告诉您发生了什么。tl;drYou说它没有运行。您可能会在某个时候遇到编译错误或堆栈跟踪。请编辑您的问题以包含编译错误或堆栈跟踪。请尝试只发布代码的重要部分。logcat会告诉您发生了什么。tl;dr程序仍然没有运行:(我仍然收到相同的logcat错误尝试从手机中删除你的应用程序,然后再次运行。在你的SqliteOpenHelper中放置一些断点,以查看sql语句是否正确执行。在你的logcat中查找SQLite异常,它们可能不会使你的应用程序崩溃,但表明重新创建表有问题。如果应用程序在第6列失败,这意味着hat other 5正常,因此您的数据库尚未正确升级程序仍无法运行:(我仍然收到相同的logcat错误尝试从手机中删除你的应用程序,然后再次运行。在你的SqliteOpenHelper中放置一些断点,以查看sql语句是否正确执行。在你的logcat中查找SQLite异常,它们可能不会使你的应用程序崩溃,但表明重新创建表有问题。如果应用程序在第6列失败,这意味着其他5个还可以,所以您的数据库没有进行适当升级
public class Question extends Activity {
private int ID;
private String QUESTION;
private String OPTA;
private String OPTB;
private String OPTC;
private String OPTD;
private String ANSWER;
public Question() {
ID = 0;
QUESTION = "";
OPTA = "";
OPTB = "";
OPTC = "";
OPTD = "";
ANSWER = "";
}
public Question(String qUESTION, String oPTA, String oPTB, String oPTC,String oPTD,
String aNSWER) {
QUESTION = qUESTION;
OPTA = oPTA;
OPTB = oPTB;
OPTC = oPTC;
OPTD = oPTD;
ANSWER = aNSWER;
}
public int getID() {
return ID;
}
public String getQUESTION() {
return QUESTION;
}
public String getOPTA() {
return OPTA;
}
public String getOPTB() {
return OPTB;
}
public String getOPTC() {
return OPTC;
}
public String getOPTD() {
return OPTD;
}
public String getANSWER() {
return ANSWER;
}
public void setID(int id) {
ID = id;
}
public void setQUESTION(String qUESTION) {
QUESTION = qUESTION;
}
public void setOPTA(String oPTA) {
OPTA = oPTA;
}
public void setOPTB(String oPTB) {
OPTB = oPTB;
}
public void setOPTC(String oPTC) {
OPTC = oPTC;
}
public void setOPTD(String oPTD) {
OPTD = oPTD;
}
public void setANSWER(String aNSWER) {
ANSWER = aNSWER;
}
}
<Button
android:id="@+id/button4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:layout_marginTop="5dp"
android:background="#fff"
android:gravity="center"
android:text="31"
android:textColor="#000000"
android:textSize="25.0sp" />
FATAL EXCEPTION: main
Process: versionone.example, PID: 2252
java.lang.RuntimeException: Unable to start activity ComponentInfo{versionone.example/versionone.example.QuestionActivity}: java.lang.IllegalStateException: Couldn't read row 0, col 6 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: Couldn't read row 0, col 6 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.database.CursorWindow.nativeGetString(Native Method)
at android.database.CursorWindow.getString(CursorWindow.java:434)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
at versionone.example.QuizHelper.getAllQuestions(QuizHelper.java:90)
at versionone.example.QuestionActivity.onCreate(QuestionActivity.java:38)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
+ KEY_OPTB + " TEXT, " + KEY_OPTC + " TEXT, " + KEY_OPTD + " TEXT)";