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POCalling a method in another activity from an activity
 

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    <p>I know that we can't call a method from an Activity that's in another Activity. I'm trying to figure out the best way around this.</p> <p>Here is my code. This is the method I am trying to call. It is in my <code>ScoreCard</code> activity.</p> <pre><code>public void numPlayerSetup(){ { int[] ids = { R.id.TextView11, R.id.TextView12, R.id.TextView13 }; for(int i : ids) { TextView tv = (TextView)findViewById(i); tv.setVisibility(View.INVISIBLE); } } </code></pre> <p>Here is how I am trying to call the method. <code>score</code> is an object of the <code>ScoreCard</code> class.</p> <pre><code>public void onItemSelected(AdapterView&lt;?&gt; arg0, View arg1, int arg2, long arg3){ int item = spinner.getSelectedItemPosition(); if(item==1){ Log.i("error","This Sucks"); score.numPlayerSetup(); } } </code></pre> <p>I tried to put the <code>numPlayerSetup</code> method in a different class that would not extend <code>Activity</code>, just contain the logic, but I can't use the <code>findViewById()</code> method without extending activity.</p> <p>This is how I am calling it.</p> <pre><code>public void onItemSelected(AdapterView&lt;?&gt; arg0, View arg1, int arg2, long arg3){ int item = spinner.getSelectedItemPosition(); ArrayList&lt;TextView&gt; myTextViewList = new ArrayList&lt;TextView&gt;(); TextView tv1 = (TextView)findViewById(R.id.TextView14); myTextViewList.add(tv1); if(item==1){ Log.i("error","This Sucks"); Setup.numPlayerSetup(myTextViewList); } </code></pre> <p>Then this is the class I am calling.</p> <pre><code>public class Setup { TextView tv; public static void numPlayerSetup(ArrayList&lt;TextView&gt; tvs){ for(TextView tv : tvs) { Log.i("crash","This Sucks"); tv.setVisibility(View.INVISIBLE); //this line is highlighted in the debugger as the line my error is coming from } } } </code></pre> <p>It logs the message in the logcat and gives me a null pointer exception. The debugger says that the value for tv is null. Is this why I am getting a null pointer exception?</p>
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