I've been looking for an answer for hours now, but my calculator
wont work at all :(
I appreciate if you could
help me. I've posted the manifest code below. Inform me if you need to see the
MainActivity.java or anything else
:)
encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.elof_calc_2000_dragonslayerxx"
android:versionCode="1"
android:versionName="1.0"
>
android:minSdkVersion="15"
android:targetSdkVersion="17" />
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
>
android:name="com.example.elof_calc_2000_dragonslayerxx.MainActivity"
android:label="@string/app_name" >
The
errors shown on Logcat
03-16
18:09:59.890: E/AndroidRuntime(895): FATAL EXCEPTION: main
03-16 18:09:59.890:
E/AndroidRuntime(895): Process: com.example.elof_calc_2000_dragonslayerxx, PID:
895
03-16 18:09:59.890: E/AndroidRuntime(895):
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.elof_calc_2000_dragonslayerxx/com.example.elof_calc_2000_dragonslayerxx.MainActivity}:
java.lang.NullPointerException
03-16 18:09:59.890: E/AndroidRuntime(895): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-16
18:09:59.890: E/AndroidRuntime(895): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-16
18:09:59.890: E/AndroidRuntime(895): at
android.app.ActivityThread.access$800(ActivityThread.java:135)
03-16
18:09:59.890: E/AndroidRuntime(895): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-16
18:09:59.890: E/AndroidRuntime(895): at
android.os.Handler.dispatchMessage(Handler.java:102)
03-16 18:09:59.890:
E/AndroidRuntime(895): at android.os.Looper.loop(Looper.java:136)
03-16
18:09:59.890: E/AndroidRuntime(895): at
android.app.ActivityThread.main(ActivityThread.java:5017)
03-16 18:09:59.890:
E/AndroidRuntime(895): at java.lang.reflect.Method.invokeNative(Native
Method)
03-16 18:09:59.890: E/AndroidRuntime(895): at
java.lang.reflect.Method.invoke(Method.java:515)
03-16
18:09:59.890: E/AndroidRuntime(895): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-16
18:09:59.890: E/AndroidRuntime(895): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-16
18:09:59.890: E/AndroidRuntime(895): at dalvik.system.NativeStart.main(Native
Method)
03-16 18:09:59.890: E/AndroidRuntime(895): Caused by:
java.lang.NullPointerException
03-16 18:09:59.890: E/AndroidRuntime(895): at
com.example.elof_calc_2000_dragonslayerxx.MainActivity.onClickListeners(MainActivity.java:49)
03-16
18:09:59.890: E/AndroidRuntime(895): at
com.example.elof_calc_2000_dragonslayerxx.MainActivity.onCreate(MainActivity.java:22)
03-16
18:09:59.890: E/AndroidRuntime(895): at
android.app.Activity.performCreate(Activity.java:5231)
03-16 18:09:59.890:
E/AndroidRuntime(895): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-16
18:09:59.890: E/AndroidRuntime(895): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-16
18:09:59.890: E/AndroidRuntime(895): ... 11 more
03-16
18:16:23.316: E/AndroidRuntime(1100): FATAL EXCEPTION: main
03-16
18:16:23.316: E/AndroidRuntime(1100): Process:
com.example.elof_calc_2000_dragonslayerxx, PID: 1100
03-16 18:16:23.316:
E/AndroidRuntime(1100): java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.elof_calc_2000_dragonslayerxx/com.example.elof_calc_2000_dragonslayerxx.MainActivity}:
java.lang.NullPointerException
03-16 18:16:23.316: E/AndroidRuntime(1100): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
android.app.ActivityThread.access$800(ActivityThread.java:135)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
android.os.Handler.dispatchMessage(Handler.java:102)
03-16 18:16:23.316:
E/AndroidRuntime(1100): at android.os.Looper.loop(Looper.java:136)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
android.app.ActivityThread.main(ActivityThread.java:5017)
03-16
18:16:23.316: E/AndroidRuntime(1100): at java.lang.reflect.Method.invokeNative(Native
Method)
03-16 18:16:23.316: E/AndroidRuntime(1100): at
java.lang.reflect.Method.invoke(Method.java:515)
03-16 18:16:23.316:
E/AndroidRuntime(1100): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-16
18:16:23.316: E/AndroidRuntime(1100): at dalvik.system.NativeStart.main(Native
Method)
03-16 18:16:23.316: E/AndroidRuntime(1100): Caused by:
java.lang.NullPointerException
03-16 18:16:23.316: E/AndroidRuntime(1100): at
com.example.elof_calc_2000_dragonslayerxx.MainActivity.onClickListeners(MainActivity.java:49)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
com.example.elof_calc_2000_dragonslayerxx.MainActivity.onCreate(MainActivity.java:22)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
android.app.Activity.performCreate(Activity.java:5231)
03-16 18:16:23.316:
E/AndroidRuntime(1100): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-16
18:16:23.316: E/AndroidRuntime(1100): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-16
18:16:23.316: E/AndroidRuntime(1100): ... 11
more
class="normal">Answer
Here are
your key lines
03-16
18:16:23.316: E/AndroidRuntime(1100): Caused by:
java.lang.NullPointerException
03-16 18:16:23.316: E/AndroidRuntime(1100): at
com.example.elof_calc_2000_dragonslayerxx.MainActivity.onClickListeners(MainActivity.java:49)
You
have a NullPointerException on line 49 of your MainActivity. You can post that for
further help. Whatever code is there ensure that it is initialized (and thus not null)
before you call it.
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