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POJava Switch statement throwing Java.lang.NullPointerException - Android Beginner
 

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  1. POJava Switch statement throwing Java.lang.NullPointerException - Android Beginner
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    <p>I am a new beginner so please bear with me. I created a spinner and populated it with a string array, I then created a the method "OnItemSelected" and inserted a switch statement. The activity then throws a NullPointerException. When I remove the switch statement, the activity works. How can i fix this?</p> <p>Code:</p> <pre><code>EditText player1 = null; EditText player2 = null; EditText player3 = null; EditText player4 = null; EditText player5 = null; EditText player6 = null; EditText player7 = null; EditText player8 = null; Spinner spinner; int numberOfPlayers = 0; int counter = 0; private String[] players ={"2","3","4", "5", "6", "7", "8"}; //private String[] names ={" "}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); try { spinner = (Spinner)findViewById(R.id.spinnerplayers); ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_spinner_item, players); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); spinner.setOnItemSelectedListener(this); }catch (Exception e) { // handle any errors Log.e("TestActivity", "Error in activity", e); // log the error // Also let the user know something went wrong Toast.makeText(getApplicationContext(), e.getClass().getName() + " " + e.getMessage(),Toast.LENGTH_LONG).show(); } } @Override public void onItemSelected(AdapterView&lt;?&gt; arg0, View arg1, int pos, long id) { numberOfPlayers = pos + 2; /*switch(pos){ case 0: player1.findViewById(R.id.editTextPlayer1); player2.findViewById(R.id.editTextPlayer2); player1.setVisibility(View.VISIBLE); player2.setVisibility(View.VISIBLE); break; case 1: player1.findViewById(R.id.editTextPlayer1); player2.findViewById(R.id.editTextPlayer2); player3.findViewById(R.id.editTextPlayer3); player1.setVisibility(View.VISIBLE); player2.setVisibility(View.VISIBLE); player3.setVisibility(View.VISIBLE); break; case 2: player1.findViewById(R.id.editTextPlayer1); player2.findViewById(R.id.editTextPlayer2); player3.findViewById(R.id.editTextPlayer3); player4.findViewById(R.id.editTextPlayer4); player1.setVisibility(View.VISIBLE); player2.setVisibility(View.VISIBLE); player3.setVisibility(View.VISIBLE); player4.setVisibility(View.VISIBLE); break; case 3: player1.findViewById(R.id.editTextPlayer1); player2.findViewById(R.id.editTextPlayer2); player3.findViewById(R.id.editTextPlayer3); player4.findViewById(R.id.editTextPlayer4); player5.findViewById(R.id.editTextPlayer5); player1.setVisibility(View.VISIBLE); player2.setVisibility(View.VISIBLE); player3.setVisibility(View.VISIBLE); player4.setVisibility(View.VISIBLE); player5.setVisibility(View.VISIBLE); break; case 4: player1.findViewById(R.id.editTextPlayer1); player2.findViewById(R.id.editTextPlayer2); player3.findViewById(R.id.editTextPlayer3); player4.findViewById(R.id.editTextPlayer4); player5.findViewById(R.id.editTextPlayer5); player6.findViewById(R.id.editTextPlayer6); player1.setVisibility(View.VISIBLE); player2.setVisibility(View.VISIBLE); player3.setVisibility(View.VISIBLE); player4.setVisibility(View.VISIBLE); player5.setVisibility(View.VISIBLE); player6.setVisibility(View.VISIBLE); break; case 5: player1.findViewById(R.id.editTextPlayer1); player2.findViewById(R.id.editTextPlayer2); player3.findViewById(R.id.editTextPlayer3); player4.findViewById(R.id.editTextPlayer4); player5.findViewById(R.id.editTextPlayer5); player6.findViewById(R.id.editTextPlayer6); player7.findViewById(R.id.editTextPlayer7); player1.setVisibility(View.VISIBLE); player2.setVisibility(View.VISIBLE); player3.setVisibility(View.VISIBLE); player4.setVisibility(View.VISIBLE); player5.setVisibility(View.VISIBLE); player6.setVisibility(View.VISIBLE); player7.setVisibility(View.VISIBLE); break; case 6: player1.findViewById(R.id.editTextPlayer1); player2.findViewById(R.id.editTextPlayer2); player3.findViewById(R.id.editTextPlayer3); player4.findViewById(R.id.editTextPlayer4); player5.findViewById(R.id.editTextPlayer5); player6.findViewById(R.id.editTextPlayer6); player7.findViewById(R.id.editTextPlayer7); player8.findViewById(R.id.editTextPlayer8); player1.setVisibility(View.VISIBLE); player2.setVisibility(View.VISIBLE); player3.setVisibility(View.VISIBLE); player4.setVisibility(View.VISIBLE); player5.setVisibility(View.VISIBLE); player6.setVisibility(View.VISIBLE); player7.setVisibility(View.VISIBLE); player8.setVisibility(View.VISIBLE); break; }*/ } </code></pre> <p>and then here is my logcat:</p> <pre><code> 06-06 12:44:42.433: E/AndroidRuntime(5764): FATAL EXCEPTION: main 06-06 12:44:42.433: E/AndroidRuntime(5764): java.lang.NullPointerException 06-06 12:44:42.433: E/AndroidRuntime(5764): at com.brightdesign.truthordare.Main.onItemSelected(Main.java:69) 06-06 12:44:42.433: E/AndroidRuntime(5764): at android.widget.AdapterView.fireOnSelected(AdapterView.java:873) 06-06 12:44:42.433: E/AndroidRuntime(5764): at android.widget.AdapterView.access$300(AdapterView.java:45) 06-06 12:44:42.433: E/AndroidRuntime(5764): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:839) 06-06 12:44:42.433: E/AndroidRuntime(5764): at android.os.Handler.handleCallback(Handler.java:587) 06-06 12:44:42.433: E/AndroidRuntime(5764): at android.os.Handler.dispatchMessage(Handler.java:92) 06-06 12:44:42.433: E/AndroidRuntime(5764): at android.os.Looper.loop(Looper.java:123) 06-06 12:44:42.433: E/AndroidRuntime(5764): at android.app.ActivityThread.main(ActivityThread.java:4627) 06-06 12:44:42.433: E/AndroidRuntime(5764): at java.lang.reflect.Method.invokeNative(Native Method) 06-06 12:44:42.433: E/AndroidRuntime(5764): at java.lang.reflect.Method.invoke(Method.java:521) 06-06 12:44:42.433: E/AndroidRuntime(5764): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 06-06 12:44:42.433: E/AndroidRuntime(5764): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 06-06 12:44:42.433: E/AndroidRuntime(5764): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Thanks in advance!</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USDrew
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    3. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhat line is it? I don't even see an un-commented switch statement. What's null? How can we help?
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      1. POJava Switch statement throwing Java.lang.NullPointerException - Android Beginner
      1. USDave Newton
    2. COapart from the actual issue, you can avoid a lot of repetition by counting downward in the switch, and omitting the breaks to let execution go through the cases following it. i.e. case 6: player8.xxx; case 5: player7.xxx; case 4:player6.xxx; etc
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      1. POJava Switch statement throwing Java.lang.NullPointerException - Android Beginner
      1. USDHall
 

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