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PONoSuchFieldError on findViewById()
 

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  1. PONoSuchFieldError on findViewById()
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    <p>There's two android projects I want to merge, one is Main and the other is linked as Library. But I have some troubles on this line:</p> <pre><code>Button modificarC; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_menu_calificaciones); modificarC = (Button) findViewById(R.id.btn_aseso); //HERE </code></pre> <p>I tried Project Clean... also I have android-support-v4.jar on my dependencies</p> <p>And this is my trace:</p> <pre><code>04-24 19:39:52.568: E/AndroidRuntime(9486): FATAL EXCEPTION: main 04-24 19:39:52.568: E/AndroidRuntime(9486): java.lang.NoSuchFieldError: com.utez.sistemas.sam.R$id.btn_aseso 04-24 19:39:52.568: E/AndroidRuntime(9486): at com.utez.sistemas.sam.calificaciones.CalificacionesActivity.onCreate(CalificacionesActivity.java:67) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.app.Activity.performCreate(Activity.java:4465) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.app.ActivityThread.access$600(ActivityThread.java:127) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.os.Handler.dispatchMessage(Handler.java:99) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.os.Looper.loop(Looper.java:137) 04-24 19:39:52.568: E/AndroidRuntime(9486): at android.app.ActivityThread.main(ActivityThread.java:4507) 04-24 19:39:52.568: E/AndroidRuntime(9486): at java.lang.reflect.Method.invokeNative(Native Method) 04-24 19:39:52.568: E/AndroidRuntime(9486): at java.lang.reflect.Method.invoke(Method.java:511) 04-24 19:39:52.568: E/AndroidRuntime(9486): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 04-24 19:39:52.568: E/AndroidRuntime(9486): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 04-24 19:39:52.568: E/AndroidRuntime(9486): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Also here is the layout:</p> <pre><code>&lt;LinearLayout style="@style/LoginFormContainer" android:layout_width="253dp" android:layout_height="260dp" android:layout_marginLeft="15dp" android:layout_marginTop="30dp" android:orientation="vertical" &gt; &lt;Button android:id="@+id/btn_alta" android:layout_width="match_parent" android:layout_height="63dp" android:layout_marginLeft="25dp" android:layout_marginTop="5dp" android:background="@drawable/btn_altacalif" android:contentDescription="@string/action_sign_in_register" android:paddingLeft="32dp" android:paddingRight="32dp" android:textAlignment="center" /&gt; &lt;Button android:id="@+id/btn_aseso" android:layout_width="match_parent" android:layout_height="0dp" android:layout_marginLeft="25dp" android:layout_marginTop="5dp" android:layout_weight="0.16" android:background="@drawable/btn_modcalif" android:contentDescription="@string/action_sign_in_register" android:paddingLeft="32dp" android:paddingRight="32dp" android:textAlignment="center" /&gt; &lt;/LinearLayout&gt; </code></pre>
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    1. USMauricio Zárate
    1. USMauricio Zárate
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    1. COIs `btn_aseso` a field in your `activity_menu_calificaciones` layout XML file?
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      1. USSteven Wolfe
    2. COYes it is, I already edited my question.
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      1. USMauricio Zárate
    3. COYour layout looks fine to me. It must be something with your project set up. I'm assuming that the `activity_menu_calificaciones` file is only present in one of the projects.
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      1. USSteven Wolfe
 

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