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  1. 03-24 13:37:16.226 4898-4898/com.example.android.monopoly E/AndroidRuntime: FATAL EXCEPTION: main
  2. Process: com.example.android.monopoly, PID: 4898
  3. java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.monopoly/com.example.android.monopoly.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
  4. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2470)
  5. at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2532)
  6. at android.app.ActivityThread.access$900(ActivityThread.java:169)
  7. at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)
  8. at android.os.Handler.dispatchMessage(Handler.java:111)
  9. at android.os.Looper.loop(Looper.java:194)
  10. at android.app.ActivityThread.main(ActivityThread.java:5562)
  11. at java.lang.reflect.Method.invoke(Native Method)
  12. at java.lang.reflect.Method.invoke(Method.java:372)
  13. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:968)
  14. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:763)
  15. Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
  16. at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:719)
  17. at android.view.LayoutInflater.rInflate(LayoutInflater.java:810)
  18. at android.view.LayoutInflater.inflate(LayoutInflater.java:508)
  19. at android.view.LayoutInflater.inflate(LayoutInflater.java:418)
  20. at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
  21. at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
  22. at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
  23. at com.example.android.monopoly.MainActivity.onCreate(MainActivity.java:15)
  24. at android.app.Activity.performCreate(Activity.java:6029)
  25. at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
  26. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2423)
  27. at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2532) 
  28. at android.app.ActivityThread.access$900(ActivityThread.java:169) 
  29. at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421) 
  30. at android.os.Handler.dispatchMessage(Handler.java:111) 
  31. at android.os.Looper.loop(Looper.java:194) 
  32. at android.app.ActivityThread.main(ActivityThread.java:5562) 
  33. at java.lang.reflect.Method.invoke(Native Method) 
  34. at java.lang.reflect.Method.invoke(Method.java:372) 
  35. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:968) 
  36. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:763) 
  37.  
  38. package com.example.android.monopoly;
  39.  
  40. import android.content.Intent;
  41. import android.support.v7.app.AppCompatActivity;
  42. import android.os.Bundle;
  43. import android.view.View;
  44. import android.widget.Button;
  45. import android.widget.TextView;
  46.  
  47. public class MainActivity extends AppCompatActivity {
  48.  
  49. @Override
  50. protected void onCreate(Bundle savedInstanceState) {
  51. super.onCreate(savedInstanceState);
  52. setContentView(R.layout.activity_main);
  53.  
  54. Button turnBut = (Button) findViewById(R.id.turn_but);
  55. Button addBut = (Button) findViewById(R.id.add_but);
  56.  
  57. View.OnClickListener onClickListener = new View.OnClickListener() {
  58. @Override
  59. public void onClick(View view) {
  60. switch (view.getId()) {
  61. case R.id.turn_but: addTurn() ; break;
  62. case R.id.add_but: startActivity(new Intent(MainActivity.this,Pop.class)); ; break;
  63.  
  64. }
  65. }
  66. };
  67.  
  68. turnBut.setOnClickListener(onClickListener);
  69. addBut.setOnClickListener(onClickListener);
  70. }
  71.  
  72. private void addTurn(){
  73. TextView TurnsScore = (TextView) findViewById(R.id.turns_score_view);
  74. TurnsScore.setText(String.valueOf(Integer.parseInt(TurnsScore.getText().toString()) + 1));
  75. }
  76. }
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