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POAndroid Development : id cannot be resolved or is not a field
 

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  1. POAndroid Development : id cannot be resolved or is not a field
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    <p>So I just started Android development, and I've already hit a wall. I have been looking around a whole lot online and on this website, but can't seem to find an answer that works for me. All I have written down so far in my Activity file is the following.</p> <pre><code>import android.app.Activity; import android.os.Bundle; import android.widget.Button; public class CommanderActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final Button button = (Button) findViewById( R.id.button_id ); } } </code></pre> <p>It is in the last line of code ( R.id.button_id ) where the error arises. My XML file looks like this: </p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content" &gt; &lt;TableRow&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="match_parent" android:text="@string/Parameters" android:onClick="openParameters" /&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="match_parent" android:text="@string/Waves" android:onClick="openWaves" /&gt; &lt;/TableRow&gt; &lt;TableRow&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@string/MoreParameters" android:onClick="openMoreParameters" /&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@string/Status" android:onClick="openStatus" /&gt; &lt;/TableRow&gt; &lt;TableRow&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@string/Operations" android:onClick="openOperations" /&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@string/Monitor" android:onClick="openMonitor" /&gt; &lt;/TableRow&gt; &lt;TableRow&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@string/CEBus" android:onClick="openCEBus" /&gt; &lt;Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@string/Advanced" android:onClick="openAdvanced" /&gt; &lt;/TableRow&gt; &lt;/TableLayout&gt; &lt;/LinearLayout&gt; </code></pre>
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    1. PO
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    1. USRonak Mehta
    1. USJuiCe
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    2. VO
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      1. POAndroid Development : id cannot be resolved or is not a field
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      1. VTUpMod
    1. CONone of your buttons have an `id`. Hence the error.
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      1. POAndroid Development : id cannot be resolved or is not a field
      1. USKazekage Gaara
    2. COKazekage got it right. Also, since all your buttons have an `android:onClick` attribute, why do you need to locate a specific button?
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      1. POAndroid Development : id cannot be resolved or is not a field
      1. USTed Hopp
 

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