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  1. PO
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    <p>I think you're not using <code>@+id</code> and <code>@id</code> correctly. <code>@+id</code> should be used only once.</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/rl" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" &gt; &lt;com.example.mybasicinteractivegraph.GraphBoarder android:id="@+id/view" android:layout_width="match_parent" android:layout_height="150dp" /&gt; &lt;com.example.mybasicinteractivegraph.GraphView android:id="@+id/graphAxes" android:layout_width="50dp" android:layout_height="50dp" android:layout_alignBottom="@+id/view" android:layout_alignLeft="@+id/view" android:layout_alignRight="@+id/view" android:layout_alignTop="@+id/view" android:layout_marginBottom="15dp" android:layout_marginLeft="15dp" android:layout_marginRight="15dp" android:layout_marginTop="15dp" /&gt; &lt;SeekBar android:id="@+id/seekBar1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignLeft="@id/view" android:layout_below="@id/view" android:layout_marginTop="42dp" /&gt; &lt;SeekBar android:id="@+id/seekBar2" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignLeft="@id/seekBar1" android:layout_below="@id/seekBar1" android:layout_marginTop="55dp" /&gt; &lt;Button android:id="@+id/button1" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_alignLeft="@id/graphAxes" android:layout_below="@id/seekBar2" android:layout_marginTop="63dp" android:onClick="btnFreq1" android:text="@string/btn1Text" android:textSize="12sp" /&gt; &lt;Button android:id="@+id/button2" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_above="@+id/button5" android:layout_toRightOf="@id/button1" android:onClick="btnFreq2" android:text="@string/btn2Text" android:textSize="12sp" /&gt; &lt;Button android:id="@+id/button3" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_alignBaseline="@id/button2" android:layout_alignBottom="@id/button2" android:layout_alignLeft="@+id/button7" android:onClick="btnFreq3" android:text="@string/btn3Text" android:textSize="12sp" /&gt; &lt;Button android:id="@+id/button4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@id/button3" android:layout_toRightOf="@id/button3" android:onClick="btnFreq4" android:text="@string/btn4Text" android:textSize="12sp" /&gt; &lt;Button android:id="@id/button5" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_alignLeft="@id/button1" android:layout_below="@id/button1" android:layout_marginTop="48dp" android:onClick="btnFreq5" android:text="@string/btn5Text" android:textSize="12sp" /&gt; &lt;Button android:id="@+id/button6" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_alignBaseline="@id/button5" android:layout_alignBottom="@id/button5" android:layout_toRightOf="@id/button1" android:onClick="btnFreq6" android:text="@string/btn6Text" android:textSize="12sp" /&gt; &lt;Button android:id="@id/button7" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_alignBaseline="@id/button6" android:layout_alignBottom="@id/button6" android:layout_toRightOf="@id/button2" android:onClick="btnFreq7" android:text="@string/btn7Text" android:textSize="12sp" /&gt; &lt;Button android:id="@+id/button8" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_alignBaseline="@id/button7" android:layout_alignBottom="@id/button7" android:layout_toRightOf="@id/button3" android:onClick="btnFreq8" android:text="@string/btn8Text" android:textSize="12sp" /&gt; &lt;Button android:id="@+id/button9" android:layout_width="45dp" android:layout_height="wrap_content" android:layout_alignTop="@id/button8" android:layout_toLeftOf="@id/textView3" android:onClick="btnPrevClk" android:text="@string/btnPrevText" android:textSize="12sp" /&gt; &lt;Button android:id="@+id/button10" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/button9" android:layout_centerHorizontal="true" android:clickable="true" android:onClick="btnSetGraphClk" android:text="@string/btnSetGraph" android:textSize="12sp" /&gt; &lt;TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@id/button10" android:layout_alignTop="@id/button4" android:text="@string/txtView3" /&gt; &lt;TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@id/button10" android:layout_below="@id/textView3" android:text="@string/txtView1" /&gt; &lt;TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@id/button10" android:layout_below="@id/textView1" android:text="@string/txtView2" /&gt; &lt;/RelativeLayout&gt; </code></pre>
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    1. POWhy doesn't the button label show what is in string.xml? (Android UI basics)
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    1. USSzymon
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    1. COThanks that seems to solve the problem. But again, why doesn't it show up on the SDK? And is the order in which the buttons are declared in the xml file important in any way? For example, please check the updated xml file I will post to my question. Take for example, `button 2` -> `android:id="@+id/button2"`. In this code block, in the line `android:layout_above="@+id/button5"` the compiler shows an error and says button5 not declared. Why is that?
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    2. COThe order is important for z-order for instance. What is important though, is to always declare each variable once with `@+id`.
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    3. COso let's take the declaration of button2 for instance. If I don't put `+` in the line `android:layout_above="@+id/button5"` it does not compile. So does this mean when I really do declare button5, I do not need to give `+`, in the line `android:id="@+id/button5"`? How exactly does declaring variable in xml work? And what is z-order?
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