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POnumberpicker not responding
 

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    <p>I'm very new to Android I'm picking it up fast but not fast enough. I have number picker widget on my app. The widget loads on the page but there are two problems. The first is inside the widget box nothing is displayed where 0 was expected. The second problem is if either + or - button is pressed the app crashes. My device is Android 2.3.4 (HTC Wildfire) and I'm working in eclipse.</p> <p>Here is my java file</p> <pre><code> public class NumberPickerActivity extends Activity { private Button upButton; private Button downButton; private EditText editText; private int uprange = 20; private int downrange = 0; private int values = 0; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); upButton = (Button) findViewById(R.id.upButton); downButton = (Button) findViewById(R.id.downButton); editText = (EditText) findViewById(R.id.numberEditText); upButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { downButton.setBackgroundResource(R.drawable.timepicker_down_normal); upButton.setBackgroundResource(R.drawable.timepicker_up_pressed); if (values &gt;= downrange &amp;&amp; values &lt;= uprange) values++; if (values &gt; uprange) values = downrange; editText.setText("" + values); } }); downButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { downButton .setBackgroundResource(R.drawable.timepicker_down_pressed); upButton.setBackgroundResource(R.drawable.timepicker_up_normal); if (values &gt;= downrange &amp;&amp; values &lt;= uprange) values--; if (values &lt; downrange) values = uprange; editText.setText(values + ""); } }); } } </code></pre> <p>This is my xml</p> <pre><code> &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/background" android:orientation="horizontal" &gt; &lt;Button android:id="@+id/upButton" android:layout_width="50sp" android:layout_height="50sp" android:layout_toLeftOf="@+id/numberEditText" android:background="@drawable/timepicker_up_normal" android:onClick="onupButtonPress"/&gt; &lt;TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/textView2" android:layout_alignLeft="@+id/textView2" android:layout_alignRight="@+id/textView2" android:layout_marginRight="43dp" android:text="Welcome whatever your name is" android:textSize="24sp" /&gt; &lt;Button android:id="@+id/downButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/numberEditText" android:layout_alignLeft="@+id/upButton" android:layout_alignRight="@+id/upButton" android:layout_below="@+id/upButton" android:background="@drawable/timepicker_down_normal" android:onClick="ondownButtonPress"/&gt; &lt;EditText android:id="@+id/numberEditText" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/scanButton" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:background="@drawable/timepicker_input_selected" android:ems="10" android:gravity="center" android:inputType="number" /&gt; &lt;/RelativeLayout&gt; </code></pre>
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    1. USSmulianJulian
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    1. CO`android:onClick="onupButtonPress"` refers to a method that doesn't exist, afaics (also, one tip : the most important thing about debugging is to learn to read the stacktrace when it crashes. everything is there.)
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      1. USnjzk2
    2. COMy apologies. The actual question is what am I doing wrong here and can you lead me in the right direction. From my LOGCAT. E/AndroidRuntime(9371): java.lang.IllegalStateException: Could not find a method ondownButtonPress(View) in the activity class org.my.scanExample.MyScanActivity for onClick handler on view class android.widget.Button with id 'downButton'.
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      1. USSmulianJulian
    3. COfirst part of my comment : `android:onClick="ondownButtonPress"` refers to a method that doesn't exist. if you are setting a onClickListener, you don't need to declare the onClick in the xml.
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