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POnullpointerexection while executing setVisibility.GONE for radiobuttons
 

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  1. POnullpointerexection while executing setVisibility.GONE for radiobuttons
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    <p>Basically I have singleitemactivity where the information about a single item is displayed after fetching JSON data through URL. I am getting a <code>nullpointerexception</code> (Please view the logcat output) when I try to <code>setVisibility.GONE</code> for radiobuttons inside <code>onPostExecute</code>. The if else statement are added inorder to check in which category the products fall in. For example Pizza can have multiple sizes, so I have 4 prices displayed whereas sizes don't apply on sidelines so it has only one price displayed. So in order to achieve this functionality, I am trying to hide the other 3 radiobuttons if the product category is "sidelines". I hope you get it.</p> <pre><code> @Override protected void onPostExecute(String file_url) { pDialog.dismiss(); // updating UI from Background Thread runOnUiThread(new Runnable() { @Override public void run() { /** * Updating parsed JSON data into ListView * */ if(check&lt;=2) { Log.i("Check Value","The check value is" + check); Log.i("Adapter:"," Category Value is less than 2"); ListAdapter adapter = new SimpleAdapter( SingleItemActivity.this, selquesList, R.layout.single_item_layout, new String[] { TAG_newPID, TAG_NAME, TAG_INFO,TAG_SMALLPRICE,TAG_MEDIUMPRICE,TAG_LARGE,TAG_xLARGE }, new int[] { R.id.itemid, R.id.itemname, R.id.iteminfo,R.id.smallprice, R.id.mediumprice, R.id.largeprice,R.id.xlargeprice}); // updating listview setListAdapter(adapter); } else { ListAdapter adapter2 = new SimpleAdapter( SingleItemActivity.this, selquesList, R.layout.single_item_layout, new String[] { TAG_newPID, TAG_NAME, TAG_INFO, TAG_PRICE }, new int[] { R.id.itemid, R.id.itemname, R.id.iteminfo, R.id.price}); RadioButton mediumRadioButton = (RadioButton) findViewById(R.id.medium); RadioButton largeRadioButton = (RadioButton) findViewById(R.id.large); RadioButton xlargeRadioButton = (RadioButton) findViewById(R.id.xlarge); Intent intentradiocheck = getIntent(); int radioavailcheck = intentradiocheck.getIntExtra("int_value", 0); Log.i("SingleItemActivity","Value of radioavailcheck: "+radioavailcheck); if(radioavailcheck &gt; 2) { Log.i("SingleItemActivity","Inside the if loop because radioavailcheck&gt;2"); mediumRadioButton.setVisibility(View.GONE); largeRadioButton.setVisibility(View.GONE); xlargeRadioButton.setVisibility(View.GONE); } setListAdapter(adapter2); } } }); } </code></pre> <p>LogCat Output:</p> <pre><code> 06-10 18:32:23.885: I/SingleItemActivity(306): Inside oncreate 06-10 18:32:24.704: D/dalvikvm(306): GC_FOR_MALLOC freed 3410 objects / 387688 bytes in 341ms 06-10 18:32:25.624: D/All Items:(306): {"success":1,"menu":[{"price":"3.95","itemID":"8","categoryID":"3","itemname":"Beer Nastro","iteminfo":"Beer","small":"0","large":"0","medium":"0","xlarge":"0","discount":"0"}]} 06-10 18:32:25.634: I/SingleItemActivity(306): Value of radioavailcheck: 3 06-10 18:32:25.634: I/SingleItemActivity(306): Inside the if loop because radioavailcheck&gt;2 06-10 18:32:25.634: D/AndroidRuntime(306): Shutting down VM 06-10 18:32:25.634: W/dalvikvm(306): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 06-10 18:32:25.644: E/AndroidRuntime(306): FATAL EXCEPTION: main 06-10 18:32:25.644: E/AndroidRuntime(306): java.lang.NullPointerException 06-10 18:32:25.644: E/AndroidRuntime(306): at com.wbs.ginos.SingleItemActivity$LoadAllSelques$1.run(SingleItemActivity.java:243) 06-10 18:32:25.644: E/AndroidRuntime(306): at android.app.Activity.runOnUiThread(Activity.java:3707) 06-10 18:32:25.644: E/AndroidRuntime(306): at com.wbs.ginos.SingleItemActivity$LoadAllSelques.onPostExecute(SingleItemActivity.java:207) 06-10 18:32:25.644: E/AndroidRuntime(306): at com.wbs.ginos.SingleItemActivity$LoadAllSelques.onPostExecute(SingleItemActivity.java:1) 06-10 18:32:25.644: E/AndroidRuntime(306): at android.os.AsyncTask.finish(AsyncTask.java:417) 06-10 18:32:25.644: E/AndroidRuntime(306): at android.os.AsyncTask.access$300(AsyncTask.java:127) 06-10 18:32:25.644: E/AndroidRuntime(306): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 06-10 18:32:25.644: E/AndroidRuntime(306): at android.os.Handler.dispatchMessage(Handler.java:99) 06-10 18:32:25.644: E/AndroidRuntime(306): at android.os.Looper.loop(Looper.java:123) 06-10 18:32:25.644: E/AndroidRuntime(306): at android.app.ActivityThread.main(ActivityThread.java:4627) 06-10 18:32:25.644: E/AndroidRuntime(306): at java.lang.reflect.Method.invokeNative(Native Method) 06-10 18:32:25.644: E/AndroidRuntime(306): at java.lang.reflect.Method.invoke(Method.java:521) 06-10 18:32:25.644: E/AndroidRuntime(306): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 06-10 18:32:25.644: E/AndroidRuntime(306): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 06-10 18:32:25.644: E/AndroidRuntime(306): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>`</p> <p>Radiogroup code in single_item_layout.xml</p> <pre><code> &lt;RadioGroup android:id="@+id/group1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="90" android:orientation="vertical" &gt; &lt;RadioButton android:id="@+id/small" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" /&gt; &lt;RadioButton android:id="@+id/medium" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;RadioButton android:id="@+id/large" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;RadioButton android:id="@+id/xlarge" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;/RadioGroup&gt; </code></pre>
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    1. COWell, OBVIOUSLY one of the buttons is null. So check your ids...
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    2. COYou didn't setContentView.
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    3. COcheck the id of all three.
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      1. USSunil Kumar
 

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