java - Unfortunately my app has stopped in Android Emulator

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="post-text" itemprop="text">

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.