码迷,mamicode.com
首页 > 移动开发 > 详细

android bindService() NullPointerException

时间:2014-12-20 22:15:43      阅读:449      评论:0      收藏:0      [点我收藏+]

标签:android   android开发   

android app开发中 下面的代码报错误 ,bindService() NullPointerException


 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
public class MainActivity extends Activity implements OnClickListener{
 
Button but;
 
Button but2;
 
LocalBinder binder;
 
@Override
 
protected void onCreate(Bundle savedInstanceState) {
 
super.onCreate(savedInstanceState);
 
setContentView(R.layout.activity_main);
 
but = (Button) findViewById(R.id.button1);
 
but.setOnClickListener(this);
 
but = (Button) findViewById(R.id.button2);
 
}
 
 
ServiceConnection connection = new ServiceConnection(){
 
 
 
@Override
 
public void onServiceConnected(ComponentName arg0, IBinder arg1) {
 
Log.d("D1", "connecting");
 
binder = (LocalBinder) arg1;
 
 
}
 
 
 
@Override
 
public void onServiceDisconnected(ComponentName arg0) {
 
Log.d("D1", "disconnecting");
 
 
}
 
 
};
 
 
public static class ServiceTest extends Service{
 
 
 
@Override
 
public IBinder onBind(Intent arg0) {
 
// TODO Auto-generated method stub
 
return new LocalBinder();
 
}
 
 
public class LocalBinder extends Binder{
 
public void toast(){
 
Toast.makeText(getApplicationContext(), "hope this works", Toast.LENGTH_LONG).show();
 
}
 
}
 
}
 
 
 
@Override
 
public void onClick(View arg0) {
 
Intent i = new Intent(getApplicationContext(), ServiceTest.LocalBinder.class);
 
bindService(i, connection, Context.BIND_AUTO_CREATE);
 
Toast.makeText(getApplicationContext(), "bind completed", Toast.LENGTH_LONG).show();
 
}
 
 
public void binderMethod(View v){
 
binder.toast();
 
}
}
}


我自己分析了下感觉是 onServiceConnected 没有执行,所以才会引起空指针

在but2执行调用 binder.toast() 的时候 会绑定 service 和 activity
当我点击btn2的时候才抛出这个异常.

为什么 onServiceConnected 没有执行?

处理方法

 intent 在调用service的时候并没有绑定service

1
Intent i = new Intent(getApplicationContext(), ServiceTest.class);

 


原文地址:http://www.itmmd.com/201411/95.html 
该文章由 萌萌的IT人 整理发布,转载须标明出处。

android bindService() NullPointerException

标签:android   android开发   

原文地址:http://blog.csdn.net/androidmylove/article/details/42045887

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!