스도쿠에 대한 버튼을 만들고 그것에 OnClickListener
을 설정하면 About.java 및 about.xml이라는 클래스가 만들어지고 ... .XML클릭하면 ABOUT 버튼에 오류가 발생합니다
About.java
package org.example.btg;
import android.app.Activity;
import android.os.Bundle;
public class About extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.about);
}
}
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip" >
<TextView
android:id="@+id/about_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/about_text" />
</ScrollView>
Manifest.xml
about.xmlbtg.java
View aboutButton = findViewById(R.id.about_button);
aboutButton.setOnClickListener((OnClickListener) this);
View exitButton = findViewById(R.id.exit_button);
exitButton.setOnClickListener((OnClickListener) this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.about_button:
Intent i = new Intent(this, About.class);
startActivity(i);
break;
오류는 다음과 오는 때 로그 캣가 나타납니다
03-01 12:16:51.062: D/AndroidRuntime(684): Shutting down VM
03-01 12:16:51.062: W/dalvikvm(684): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
03-01 12:16:51.126: E/AndroidRuntime(684): FATAL EXCEPTION: main
03-01 12:16:51.126: E/AndroidRuntime(684): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.example.btg/org.example.btg.BrainTrainingGame}: java.lang.NullPointerException
03-01 12:16:51.126: E/AndroidRuntime(684): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.os.Handler.dispatchMessage(Handler.java:99)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.os.Looper.loop(Looper.java:123)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-01 12:16:51.126: E/AndroidRuntime(684): at java.lang.reflect.Method.invokeNative(Native Method)
03-01 12:16:51.126: E/AndroidRuntime(684): at java.lang.reflect.Method.invoke(Method.java:521)
03-01 12:16:51.126: E/AndroidRuntime(684): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-01 12:16:51.126: E/AndroidRuntime(684): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-01 12:16:51.126: E/AndroidRuntime(684): at dalvik.system.NativeStart.main(Native Method)
03-01 12:16:51.126: E/AndroidRuntime(684): Caused by: java.lang.NullPointerException
03-01 12:16:51.126: E/AndroidRuntime(684): at org.example.btg.BrainTrainingGame.onCreate(BrainTrainingGame.java:21)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-01 12:16:51.126: E/AndroidRuntime(684): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
03-01 12:16:51.126: E/AndroidRuntime(684): ... 11 more
03-01 12:21:51.292: I/Process(684): Sending signal. PID: 684 SIG: 9
도움말이 크게 감사 바램!
여전히 작동하지 않습니다.
이 무엇을 말하는 – Maneesh
을 받고 UR erorr는 "BTG가 예기치 않게 중지되었습니다"저기 "강제 닫기"버튼 –
당신이 오류를 얻을 로그 캣를 붙여주세요 : 당신은 다른 활동에 정의 된 활동을 할 수 없습니다. –