Re: [android-developers] running into an NPE error on a setText();

The error is fixed, but now when I go to use the settings its not showing what I have set. Should I open a thread for this?

On Sunday, July 29, 2012 8:59:23 AM UTC-4, Mark Murphy (a Commons Guy) wrote:

First, clean your project (Project > Clean from Eclipse main menu, or
ant clean from the command line). Then rebuild and try again.
Sometimes, the R values get a bit out of sync with other precompiled
Java code, and cleaning the project clears that up.

If the error persists, then apparently res/layout/widgetconfig.xml
does not have a widget named @+id/userNum, which is why dataResults
would be null.

On Sun, Jul 29, 2012 at 8:50 AM, Cythes <cytheshicale@gmail.com> wrote:
> I'm working on a piece of code that is a settings activity for an app
> widget. Right now I have the code set up that if takes the saved value of
> the number and enters it into the text view of another activity via shared
> settings. The issue I am running into is that when press the load button it
> fires an NPE at me on the given line of code which is: Line 48 AKA:
> dataResults.setText(dataReturned); I will post the whole code for this
> setting as well as its related logcat below:
>
> import android.app.Activity;
> import android.content.Context;
> import android.content.SharedPreferences;
> import android.os.Bundle;
> import android.view.View;
> import android.view.View.OnClickListener;
> import android.widget.Button;
> import android.widget.EditText;
> import android.widget.TextView;
>
> public class WWSettings extends Activity implements OnClickListener {
>
> EditText sharedData;
> Context c;
> TextView dataResults;
> public static String filename = "sharedString";
> SharedPreferences someData;
>
> @Override
> protected void onCreate(Bundle savedInstanceState) {
> // TODO Auto-generated method stub
> super.onCreate(savedInstanceState);
> setContentView(R.layout.widgetconfig);
> Button b = (Button) findViewById(R.id.btnwidgetconfig);
> Button b1 = (Button) findViewById(R.id.loadBtnWidgetConfig);
> c = WWSettings.this;
> b.setOnClickListener(this);
> b1.setOnClickListener(this);
> sharedData = (EditText)findViewById(R.id.etwidgitconfig);
> dataResults = (TextView)findViewById(R.id.userNum);
> someData = getSharedPreferences(filename, 0);
> }
>
> public void onClick(View v) {
> // TODO Auto-generated method stub
> switch (v.getId()){
> case R.id.btnwidgetconfig:
> String stringData = sharedData.getText().toString();
> SharedPreferences.Editor editor = someData.edit();
> editor.putString("sharedString", stringData);
> editor.commit();
> break;
> case R.id.loadBtnWidgetConfig:
> someData = getSharedPreferences(filename, 0);
> String dataReturned = someData.getString("sharedString", "Can't
> Load....Sorry!");
> dataResults.setText(dataReturned);
> break;
> }
> }
> }
>
> And the logcat:
>
> 07-29 08:42:00.360: E/AndroidRuntime(9249): FATAL EXCEPTION: main
> 07-29 08:42:00.360: E/AndroidRuntime(9249): java.lang.NullPointerException
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> lionsimage.com.onClick(Settings.java:48)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> android.view.View.performClick(View.java:2485)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> android.view.View$PerformClick.run(View.java:9080)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> android.os.Handler.handleCallback(Handler.java:587)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> android.os.Handler.dispatchMessage(Handler.java:92)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> android.os.Looper.loop(Looper.java:130)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> android.app.ActivityThread.main(ActivityThread.java:3683)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> java.lang.reflect.Method.invokeNative(Native Method)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> java.lang.reflect.Method.invoke(Method.java:507)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
> 07-29 08:42:00.360: E/AndroidRuntime(9249): at
> dalvik.system.NativeStart.main(Native Method)
>
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--
Mark Murphy (a Commons Guy)
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