Textview setText from EditText in alert dialog

Question

• What's wrong with this code? The application has been stopped.

     public void names (View v) {
         AlertDialog.Builder alert = new AlertDialog.Builder(this);
         LayoutInflater inflater = getLayoutInflater();
         alert.setView(inflater.inflate(R.layout.dialog_signin, null));
         alert.setTitle("Set players names");
         alert.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
             public void onClick(DialogInterface dialog, int id) {
                 TextView j=(TextView)findViewById(R.id.textView2);
                 TextView k=(TextView)findViewById(R.id.textView3);
                 EditText l=(EditText)findViewById(R.id.player1);
                 EditText m=(EditText)findViewById(R.id.player2);
                 String name1 = l.getText().toString();
                 String name2 = m.getText().toString();
                 j.setText(name1);
                 k.setText(name2);
             }
         });
         AlertDialog dialog = alert.create();
         dialog.show();   
     }
  

  LogCat:

  06-08 18:07:20.613: D/libEGL(20332): loaded /vendor/lib/egl/libEGL_adreno.so 06-08 18:07:20.613: D/libEGL(20332): loaded /vendor/lib/egl/libGLESv1_CM_adreno.so 06-08 18:07:20.623: D/libEGL(20332): loaded /vendor/lib/egl/libGLESv2_adreno.so 06-08 18:07:20.623: I/Adreno-EGL(20332): : EGL 1.4 QUALCOMM build: (CL4169980) 06-08 18:07:20.623: I/Adreno-EGL(20332): OpenGL ES Shader Compiler Version: 17.01.10.SPL 06-08 18:07:20.623: I/Adreno-EGL(20332): Build Date: 12/01/13 Sun 06-08 18:07:20.623: I/Adreno-EGL(20332): Local Branch: 06-08 18:07:20.623: I/Adreno-EGL(20332): Remote Branch: 06-08 18:07:20.623: I/Adreno-EGL(20332): Local Patches: 06-08 18:07:20.623: I/Adreno-EGL(20332): Reconstruct Branch: 06-08 18:07:20.673: D/OpenGLRenderer(20332): Enabling debug mode 0 06-08 18:07:26.448: D/AndroidRuntime(20332): Shutting down VM 06-08 18:07:26.458: W/dalvikvm(20332): threadid=1: thread exiting with uncaught exception (group=0x415898b0) 06-08 18:07:26.458: E/AndroidRuntime(20332): FATAL EXCEPTION: main 06-08 18:07:26.458: E/AndroidRuntime(20332): java.lang.NullPointerException 06-08 18:07:26.458: E/AndroidRuntime(20332): at com.example.game.MainActivity$1.onClick(MainActivity.java:87) 06-08 18:07:26.458: E/AndroidRuntime(20332): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:171) 06-08 18:07:26.458: E/AndroidRuntime(20332): at android.os.Handler.dispatchMessage(Handler.java:99) 06-08 18:07:26.458: E/AndroidRuntime(20332): at android.os.Looper.loop(Looper.java:213) 06-08 18:07:26.458: E/AndroidRuntime(20332): at android.app.ActivityThread.main(ActivityThread.java:5225) 06-08 18:07:26.458: E/AndroidRuntime(20332): at java.lang.reflect.Method.invokeNative(Native Method) 06-08 18:07:26.458: E/AndroidRuntime(20332): at java.lang.reflect.Method.invoke(Method.java:525) 06-08 18:07:26.458: E/AndroidRuntime(20332): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:741) 06-08 18:07:26.458: E/AndroidRuntime(20332): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 06-08 18:07:26.458: E/AndroidRuntime(20332): at dalvik.system.NativeStart.main(Native Method)

  1. 
  
     06-08 18:15:27.578: D/AndroidRuntime(20809): Shutting down VM
             06-08 18:15:27.578: W/dalvikvm(20809): threadid=1: thread exiting with uncaught exception (group=0x415898b0)
             06-08 18:15:27.578: E/AndroidRuntime(20809): FATAL EXCEPTION: main
             06-08 18:15:27.578: E/AndroidRuntime(20809): java.lang.NullPointerException
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at com.example.game.MainActivity$1.onClick(MainActivity.java:92)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:171)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at android.os.Handler.dispatchMessage(Handler.java:99)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at android.os.Looper.loop(Looper.java:213)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at android.app.ActivityThread.main(ActivityThread.java:5225)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at java.lang.reflect.Method.invokeNative(Native Method)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at java.lang.reflect.Method.invoke(Method.java:525)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:741)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
             06-08 18:15:27.578: E/AndroidRuntime(20809):     at dalvik.system.NativeStart.main(Native Method)
             06-08 18:15:29.079: I/Process(20809): Sending signal. PID: 20809 SIG: 9
  

Answer 1

You must be getting NPE on getting values from EditText

Try following :

final View myLayout = inflater.inflate(R.layout.dialog_screen, null);
    alert.setView(myLayout);
    alert.setTitle("Set players names");

    alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            TextView j=(TextView)myLayout.findViewById(R.id.textView2);
            TextView k=(TextView)myLayout.findViewById(R.id.textView3);
            EditText l=(EditText)myLayout.findViewById(R.id.player1);
            EditText m=(EditText)myLayout.findViewById(R.id.player2);
            String name1 = l.getText().toString();
            String name2 = m.getText().toString();
            j.setText(name1);
            k.setText(name2);
            Log.i("j"+name1, "k"+name2);
        }
    });