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POdisplay text value on EditText on run time
 

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    <p>I'm a novice in java and android development. I'm developing this very basic 4x4 sudoku app wherein m trying to display some text values based on the game number. However, at run time the text in the EditText field displays blank.</p> <p><strong>Below is the code in onCreate()</strong></p> <pre><code> a=gamenumber(); //returns a random game number displayrandommatrix(a); findviewbyidfunc(); </code></pre> <p><strong>Below is the sample code for displaying values in EditText</strong></p> <pre><code> public void displayrandommatrix(int n) { switch(n) { case 1: r11.setText("2"); r12.setText("3"); r23.setText("3"); r24.setText("2"); r32.setText("4"); r33.setText("2"); r41.setText("1"); r44.setText("3"); break; case 2: r12.setText("2"); r13.setText("4"); r21.setText("1"); r24.setText("3"); r31.setText("4"); r34.setText("2"); r42.setText("1"); r43.setText("3"); break; } </code></pre> <p><strong>This is the code I'm using for random game number.</strong></p> <pre><code> public int gamenumber() { int b=randint.charAt(r.nextInt(randint.length())); return b; } public void findviewbyidfunc() { checksol=(Button)findViewById(R.id.checksol1); r11=(EditText)findViewById(R.id.row1col1); r21=(EditText)findViewById(R.id.row2col1); r31=(EditText)findViewById(R.id.row3col1); r41=(EditText)findViewById(R.id.row4col1); } </code></pre> <p><strong>List of Logcat errors:</strong> 10-21 06:15:12.564: E/AndroidRuntime(1467): FATAL EXCEPTION: main 10-21 06:15:12.564: E/AndroidRuntime(1467): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sudokunew/com.example.sudokunew.Level2_play}: java.lang.NullPointerException 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.ActivityThread.access$600(ActivityThread.java:141) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.os.Handler.dispatchMessage(Handler.java:99) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.os.Looper.loop(Looper.java:137) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-21 06:15:12.564: E/AndroidRuntime(1467): at java.lang.reflect.Method.invokeNative(Native Method) 10-21 06:15:12.564: E/AndroidRuntime(1467): at java.lang.reflect.Method.invoke(Method.java:525) 10-21 06:15:12.564: E/AndroidRuntime(1467): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-21 06:15:12.564: E/AndroidRuntime(1467): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-21 06:15:12.564: E/AndroidRuntime(1467): at dalvik.system.NativeStart.main(Native Method) 10-21 06:15:12.564: E/AndroidRuntime(1467): Caused by: java.lang.NullPointerException 10-21 06:15:12.564: E/AndroidRuntime(1467): at com.example.sudokunew.Level2_play.displayrandommatrix(Level2_play.java:177) 10-21 06:15:12.564: E/AndroidRuntime(1467): at com.example.sudokunew.Level2_play.onCreate(Level2_play.java:26) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.Activity.performCreate(Activity.java:5133) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 10-21 06:15:12.564: E/AndroidRuntime(1467): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 10-21 06:15:12.564: E/AndroidRuntime(1467): ... 11 more</p>
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    2. COsee my answer, that is your error..according to the logs..
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      1. USVedang Jadhav
 

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