我刚接触Android/Java编程,正在寻求一些帮助,针对我正在处理的一个非常基础的应用程序。我主要是为了熟悉Java编码和构建Droid应用程序而构建此应用程序,请多多包涵。
我有10个单选按钮分组在一起,只有其中的一个是正确答案(第10个按钮)。如果用户单击其中任何一个1-9的按钮,我会显示一条消息,说“很抱歉,请重试”,但是如果他们单击第10个按钮,我想要它带他们转到一个新的活动页面,即一个页面上,我将放置一些图形和文本,表示祝贺和类似的事情。1-9的按钮工作正常,但当我单击第10个按钮时,我收到一个强制关闭错误。
以下是我目前的代码:
public class MainQuiz extends Activity implements OnCheckedChangeListener, android.widget.RadioGroup.OnCheckedChangeListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_quiz);
((RadioGroup)findViewById(R.id.radio_group)).setOnCheckedChangeListener(this);}
public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
String numeral = null;
if (checkedId == R.id.button1) {
numeral = "Nope, try again!";
} else if (checkedId == R.id.button2) {
numeral = "Nope, try again!";
} else if (checkedId == R.id.button3) {
numeral = "Nope, try again!";
}
else if (checkedId == R.id.button4) {
numeral = "Nope, try again!";
}
else if (checkedId == R.id.button5) {
numeral = "Nope, try again!";
}
else if (checkedId == R.id.button6) {
numeral = "Nope, try again!";
}
else if (checkedId == R.id.button7) {
numeral = "Nope, try again!";
}
else if (checkedId == R.id.button8) {
numeral = "Nope, try again!";
}
else if (checkedId == R.id.button9) {
numeral = "Nope, try again!";
}
else if (checkedId == R.id.button10) {
Intent myIntent = new Intent(MainQuiz.this, CorrectAnswer.class);
MainQuiz.this.startActivity(myIntent);
}
Toast.makeText(getApplicationContext(), ""+numeral+"",
Toast.LENGTH_SHORT).show(); }
任何帮助都将不胜感激,我相信这只是一个简单的修复,我也相信在语法和代码方面有一些明显的问题,但是,我还是个新手 :)
谢谢!
下面是强制关闭后的日志:
11-14 13:56:48.982: D/AndroidRuntime(862): Shutting down VM
11-14 13:56:48.982: W/dalvikvm(862): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
11-14 13:56:48.992: E/AndroidRuntime(862): FATAL EXCEPTION: main
11-14 13:56:48.992: E/AndroidRuntime(862): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.test.quiz/com.test.quiz.CorrectAnswer}: java.lang.ClassCastException: com.test.quiz.CorrectAnswer
11-14 13:56:48.992: E/AndroidRuntime(862): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
11-14 13:56:48.992: E/AndroidRuntime(862): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-14 13:56:48.992: E/AndroidRuntime(862): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-14 13:56:48.992: E/AndroidRuntime(862): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-14 13:56:48.992: E/AndroidRuntime(862): at android.os.Handler.dispatchMessage(Handler.java:99)
11-14 13:56:48.992: E/AndroidRuntime(862): at android.os.Looper.loop(Looper.java:123)
11-14 13:56:48.992: E/AndroidRuntime(862): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-14 13:56:48.992: E/AndroidRuntime(862): at java.lang.reflect.Method.invokeNative(Native Method)
11-14 13:56:48.992: E/AndroidRuntime(862): at java.lang.reflect.Method.invoke(Method.java:521)
11-14 13:56:48.992: E/AndroidRuntime(862): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-14 13:56:48.992: E/AndroidRuntime(862): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-14 13:56:48.992: E/AndroidRuntime(862): at dalvik.system.NativeStart.main(Native Method)
11-14 13:56:48.992: E/AndroidRuntime(862): Caused by: java.lang.ClassCastException: com.test.quiz.CorrectAnswer
11-14 13:56:48.992: E/AndroidRuntime(862): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
11-14 13:56:48.992: E/AndroidRuntime(862): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
11-14 13:56:48.992: E/AndroidRuntime(862): ... 11 more