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POPlease help with this error when using separate class file in Android app
 

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  1. POPlease help with this error when using separate class file in Android app
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    <p>I'm having trouble trying to figure out how to use a function contained in a separate class file.</p> <p>My separate class file is called EncounterGenerator.java. And I call it like this:</p> <p><code>EncounterGenerator Encounter;</code> <code>testString = Encounter.EncounterGeneratorText();</code></p> <p>So below is my main file called HelloAndroid.java:</p> <pre><code>package mot.HelloAndroid; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; import android.widget.Button; import android.view.View; import android.view.View.OnClickListener; public class HelloAndroid extends Activity { /** Called when the activity is first created. */ TextView tvIntro; TextView tvNavigator; TextView tvAction; EncounterGenerator Encounter ; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); //setup text views this.setContentView(R.layout.main); tvIntro = (TextView)findViewById(R.id.tvIntro); tvNavigator = (TextView)findViewById(R.id.tvNavigator); tvAction = (TextView)findViewById(R.id.tvAction); //display game intro tvIntro.setText("Text Adventure"); try { Thread.sleep(5000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } tvIntro.setText("This is a really cool text adventure game!"); //define navigation buttons Button btnNorth = (Button)findViewById(R.id.btnNorth); btnNorth.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { tvIntro.setText("You go north"); String testString = "nothing"; try { testString = Encounter.EncounterGeneratorText(); } catch (Exception e) { e.printStackTrace(); } testString = Encounter.EncounterGeneratorText(); tvIntro.setText(testString); } }); } } </code></pre> <p></p> <p>and this is my separate class file called EncounterGenerator.java:</p> <pre><code>package mot.HelloAndroid; public class EncounterGenerator { public String EncounterGeneratorText() { String encounterText = "test value"; return encounterText; } } </code></pre> <p>Everytime I run it, and then click the button that calls the function EncounterGeneratorText() I get this error in my AVP:</p> <p>The application Hello Android has stopped unexpectedly...please try again</p> <p>If anyone could help, I'd greatly appreciate it!</p>
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    1. USSkyeBoniwell
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    1. COThe answer by @MByD is correct. In general, when you have errors, use `adb logcat`, DDMS, or the DDMS perspective in Eclipse to examine LogCat and look at the stack trace associated with your error. In this case, you would have a `NullPointerException`, and it would indicate the line number where the exception occurred.
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      1. USCommonsWare
 

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