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  1. 09-14 02:55:11.013 4502-4502/com.example.adrian.loginregister E/AndroidRuntime: FATAL EXCEPTION: main
  2. Process: com.example.adrian.loginregister, PID: 4502
  3. java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.adrian.loginregister/com.example.adrian.loginregister.LoginActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  4. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
  5. at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
  6. at android.app.ActivityThread.-wrap11(ActivityThread.java)
  7. at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
  8. at android.os.Handler.dispatchMessage(Handler.java:102)
  9. at android.os.Looper.loop(Looper.java:148)
  10. at android.app.ActivityThread.main(ActivityThread.java:5417)
  11. at java.lang.reflect.Method.invoke(Native Method)
  12. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
  13. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
  14. Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  15. at com.example.adrian.loginregister.LoginActivity.onCreate(LoginActivity.java:23)
  16. at android.app.Activity.performCreate(Activity.java:6237)
  17. at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
  18. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
  19. at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
  20. at android.app.ActivityThread.-wrap11(ActivityThread.java) 
  21. at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
  22. at android.os.Handler.dispatchMessage(Handler.java:102) 
  23. at android.os.Looper.loop(Looper.java:148) 
  24. at android.app.ActivityThread.main(ActivityThread.java:5417) 
  25. at java.lang.reflect.Method.invoke(Native Method) 
  26. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
  27. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
  28.  
  29. package com.example.adrian.loginregister;
  30.  
  31. import android.content.Intent;
  32. import android.support.v7.app.AppCompatActivity;
  33. import android.os.Bundle;
  34. import android.view.View;
  35. import android.widget.Button;
  36. import android.widget.EditText;
  37. import android.widget.TextView;
  38.  
  39. public class LoginActivity extends AppCompatActivity {
  40.  
  41. @Override
  42. protected void onCreate(Bundle savedInstanceState) {
  43. super.onCreate(savedInstanceState);
  44. setContentView(R.layout.activity_login);
  45.  
  46. final EditText etUsername = (EditText) findViewById(R.id.etUsername);
  47. final EditText etPassword = (EditText) findViewById(R.id.etPassword);
  48. final Button bLogin = (Button) findViewById(R.id.bLogin);
  49. final TextView bRegister = (TextView) findViewById(R.id.bRegister);
  50.  
  51. bRegister.setOnClickListener(new View.OnClickListener(){
  52. @Override
  53. public void onClick(View v) {
  54. Intent registerIntent = new Intent(LoginActivity.this, RegisterActivity.class);
  55. LoginActivity.this.startActivity(registerIntent);
  56. }
  57. });
  58. }
  59. }
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