关于android：如何将Activity绑定到Service并从Activity控制和管理Service

codeneng 2023-03-28 原文

How to bind an Activity to a Service and control and manage the Service from the Activity

我正在尝试将 Activity 绑定到 LocalService 以与之交互。但是在我的 Activity 中，我只能调用 LocalBinder 中定义的方法，而不能调用 LocalService 中定义的方法。我做错了什么？

没有从头开始我阅读了另一个问题，并且我已经阅读了一些如何编写一些示例代码的内容，我的代码类似于该示例代码。此外，为了方便起见，我一直在阅读一些服务文档，这里是文档该部分的一小段引述：

"当应用程序组件通过调用 bindService() 绑定到服务时，服务被"绑定"。绑定服务提供客户端-服务器接口，允许组件与服务交互、发送请求、获取结果，甚至执行所以通过进程间通信(IPC)跨进程。绑定的服务只有在另一个应用程序组件绑定到它时才会运行。多个组件可以一次绑定到服务，但是当它们全部解除绑定时，服务就会被销毁。"

但我不能那样做。如上所述，我能做的最好的事情就是在我的 LocalBinder 中定义我的 Activity 调用方法。我没有像上面黑色突出显示的部分那??样取得任何成就。

如果有帮助，这里是我的代码的相关部分。

要绑定的LocalService：

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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233

/**************************************************************************************************
* Filename: LocalService.java
* Project name: Local Service Sample
* Application name: Local Service
* Description: This file contains the LocalService (extends Service) for our Local Service app
**************************************************************************************************/

package com.marie.localservicesample;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.util.Log;
import android.widget.Toast;

public class LocalService extends Service {
private NotificationManager mNM;

// Unique Identification Number for the Notification.
// We use it on Notification start, and to cancel it.
private int NOTIFICATION = R.string.local_service_started;

// just some arbitrary numbers for test purposes
public static int statusCode = 99;
public static int emptyMsg = 549;

// I get my Extras from onStartCommand and use in ServiceWorker() thread
public static final String EXTRA_MAC ="com.marie.localservicesample.EXTRA_MAC";
private String macString;

public static final String EXTRA_MESSENGER ="com.marie.localservicesample.EXTRA_MESSENGER";
private Messenger messenger;

private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
//private static final String macString ="00:06:66:02:D0:EC";

Boolean stop_receive_data = false;

// This is the object that receives interactions from clients. See
// RemoteService for a more complete example - or not because
// this is a local service
private final IBinder mBinder = new LocalBinder();

@Override
public IBinder onBind(Intent intent) {
Log.i("onBind","called in LocalService" );
Log.i("onBind","intent:" + intent.toString());
Log.i("onBind","mBinder:" + mBinder);
return mBinder;
}

@Override
public void onCreate() {
mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

// Display a notification about us starting. We put an icon in the status bar.
showNotification();
}

// Call this at the end of onStartCommand() after we got the Extras
public void afterStartCommand() {
Thread thr = new Thread(null, new ServiceWorker(),"LocalService");
thr.start();
}

/*
* This is the ServiceWorker thread that passes messages to the handler defined in
* the Controller activity.
*/
class ServiceWorker implements Runnable
{
public void run() {
// do background processing here... something simple
Looper.prepare();

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice btDevice = btAdapter.getRemoteDevice(macString);
BluetoothSocket btSocket = null;
InputStream btIstream = null;
OutputStream btOstream = null;
try {
btSocket = btDevice.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e1) {
e1.printStackTrace();
}
try {
btSocket.connect();
} catch (IOException e1) {
e1.printStackTrace();
}
try {
btIstream = btSocket.getInputStream();
btOstream = btSocket.getOutputStream();
} catch (IOException e1) {
e1.printStackTrace();
}
try {
int data = btIstream.read();

// reset the bluetooth device
while (data != 63) {
Log.d("LocalService","resetting bluetooth device");
btOstream.write('r');
data = btIstream.read();
}

StringBuffer strBuffer = new StringBuffer("");
Boolean dataBegin = false;

int ndxPlus = 0;

while (data != -1) {
char printableB = (char) data;
if (data < 32 || data > 126) {
//printableB = ' ';
}
//Log.d("LocalService", Character.toString(printableB) +"(" + data +")");

if (data == 63) {
btOstream.write('$');
btOstream.write(',');
}
if (data == 45) {
btOstream.write('1');
btOstream.write(',');
dataBegin = true;
}
if (dataBegin == true) {
strBuffer = strBuffer.append(Character.toString(printableB));
}
if (data == 13) {
dataBegin = false;
//Log.d("LocalServiceDataString", strBuffer.toString());

// send data to the handler to plot the data
Message msg = Message.obtain();
msg.what = Controller.MESSAGE_MAC;
msg.obj = strBuffer;
try {
messenger.send(msg);
} catch (RemoteException e) {
e.printStackTrace();
}

strBuffer = new StringBuffer("");
if (ndxPlus < 0) {
btOstream.write('+');
ndxPlus++;
}
}

data = btIstream.read();
if (stop_receive_data) data = -1;

}

} catch (IOException e1) {
e1.printStackTrace();
}
try {
btSocket.close();
} catch (IOException e1) {
e1.printStackTrace();
}

LocalService.this.stopSelf();
Looper.loop();
// stop the service when done...
// Or use the unbindBtn in the MainActivity class?
}
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LocalService","Received start id" + startId +":" + intent);

Bundle extras = intent.getExtras();

messenger = (Messenger)extras.get(EXTRA_MESSENGER);
macString = extras.getString(EXTRA_MAC);

afterStartCommand();

// We want this service to continue running until it is explicitly
// stopped, so return sticky.
return START_STICKY;
}

@Override
public void onDestroy() {
// Cancel the persistent notification.
mNM.cancel(NOTIFICATION);
stop_receive_data = true;
// Tell the user we stopped.
Toast.makeText(this, R.string.local_service_stopped, Toast.LENGTH_SHORT).show();
}

/**
* Show a notification while this service is running.
*/
private void showNotification() {
// In this sample, we'll use the same text for the ticker and the expanded notification
CharSequence text = getText(R.string.local_service_started);

// Set the icon, scrolling text and timestamp
Notification notification = new Notification(R.drawable.stat_sample, text, System.currentTimeMillis());

// The PendingIntent to launch our activity if the user selects this notification
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, Controller.class), 0);

// Set the info for the views that show in the notification panel.
notification.setLatestEventInfo(this, getText(R.string.local_service_label), text, contentIntent);

// Send the notification.
mNM.notify(NOTIFICATION, notification);
}
}

绑定到 LocalService 的活动：

/**************************************************************************************************
* Filename: Binding.java
* Project name: Local Service Sample
* Application name: Local Service
* Description: This file contains the Binding class for our Local Service application
**************************************************************************************************/
package com.marie.localservicesample;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

/*
* Example of binding and unbinding to the local service.
* This demonstrates the implementation of a service which the client will
* bind to, receiving an object through which it can communicate with the service.
*/

public class Binding extends Activity {
private ILocalBinder mBoundService;
private boolean mIsBound;

private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
// This is called when the connection with the service has been
// established, giving us the service object we can use to
// interact with the service. Because we have bound to a explicit
// service that we know is running in our own process, we can
// cast its IBinder to a concrete class and directly access it.
mBoundService = (ILocalBinder)service;

int statusCode = mBoundService.getStatusCode();

Log.d("Binding.java","called onServiceConnected. statusCode:" + statusCode);

Toast.makeText(Binding.this, R.string.local_service_connected,
Toast.LENGTH_SHORT).show();
}

public void onServiceDisconnected(ComponentName className) {
// This is called when the connection with the service has been
// unexpectedly disconnected -- that is, its process crashed.
// Because it is running in our same process, we should never
// see this happen.
mBoundService = null;

Log.d("Binding","called onServiceDisconnected");

Toast.makeText(Binding.this, R.string.local_service_disconnected,
Toast.LENGTH_SHORT).show();
}
};

void doBindService() {
// Establish a connection with the service. We use an explicit
// class name because we want a specific service implementation that
// we know will be running in our own process (and thus won't be
// supporting component replacement by other applications).
bindService(new Intent(Binding.this, LocalService.class), mConnection, Context.BIND_AUTO_CREATE);
mIsBound = true;
}

void doUnbindService() {
if (mIsBound) {
int statusCode = mBoundService.getStatusCode();
if (statusCode != 0) Log.d("doUnbindService","Binding.java statusCode:" + statusCode);

// Tell the user we did an unbind
Toast.makeText(this, R.string.local_service_unbound, Toast.LENGTH_SHORT).show();

// Detach our existing connection.
unbindService(mConnection);
mIsBound = false;
}
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.local_service_binding);

// Watch for button clicks.
Button button = (Button)findViewById(R.id.bind);
button.setOnClickListener(mBindListener);
button = (Button)findViewById(R.id.unbind);
button.setOnClickListener(mUnbindListener);
}

private OnClickListener mBindListener = new OnClickListener() {
public void onClick(View v) {
doBindService();
}
};

private OnClickListener mUnbindListener = new OnClickListener() {
public void onClick(View v) {
doUnbindService();
}
};

@Override
protected void onDestroy() {
super.onDestroy();
doUnbindService();
}
}

我的 ILocalBinder 和 LocalBinder:

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

/**************************************************************************************************
* Filename: ILocalBinder.java
* Project name: Local Service Sample
* Application name: Local Service
* Description: This file contains an example interface for my LocalBinder
**************************************************************************************************/

package com.marie.localservicesample;

public interface ILocalBinder {

public int getStatusCode();
}

/**************************************************************************************************
* Filename: LocalBinder.java
* Project name: Local Service Sample
* Application name: Local Service
* Description: This file contains the LocalBinder class for our Local Service application
**************************************************************************************************/

package com.marie.localservicesample;

import android.os.Binder;

import com.marie.localservicesample.LocalService;

/**
* Class for clients to access. Because we know this service always
* runs in the same process as its clients, we don't need to deal with
* IPC.
*/
public class LocalBinder extends Binder implements ILocalBinder {
@Override
public int getStatusCode() {
return LocalService.statusCode;
}

}

谢谢！

参见本地服务示例。

只需将它们拥有的 binder 类代码复制到您的服务中，而不是为其创建单独的文件：(在 LocalService 类声明中)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

public class LocalService {
// This is the object that receives interactions from clients. See
// RemoteService for a more complete example.
private final IBinder mBinder = new LocalBinder();

/**
* Class for clients to access. Because we know this service always
* runs in the same process as its clients, we don't need to deal with
* IPC.
*/
public class LocalBinder extends Binder {
LocalService getService() {
return LocalService.this;
}
}

...
}

然后：

1
2
3
4
5
6
7

public void onServiceConnected(ComponentName className, IBinder service) {
// This is called when the connection with the service has been
// established, giving us the service object we can use to
// interact with the service. Because we have bound to a explicit
// service that we know is running in our own process, we can
// cast its IBinder to a concrete class and directly access it.
mBoundService = ((LocalService.LocalBinder)service).getService();

现在您可以使用 mBoundService 直接访问您的服务。

你能帮我解决这个问题吗stackoverflow.com/questions/51508046/...

Activity Service nbsp br section android interface local multithreading service

有关关于android：如何将Activity绑定到Service并从Activity控制和管理Service的更多相关文章

ruby - 如何使用 Nokogiri 的 xpath 和 at_xpath 方法 - 2
我正在学习如何使用Nokogiri，根据这段代码我遇到了一些问题:require'rubygems'require'mechanize'post_agent=WWW::Mechanize.newpost_page=post_agent.get('http://www.vbulletin.org/forum/showthread.php?t=230708')puts"\nabsolutepathwithtbodygivesnil"putspost_page.parser.xpath('/html/body/div/div/div/div/div/table/tbody/tr/td/div
ruby - 如何从 ruby 中的字符串运行任意对象方法？ - 2
总的来说，我对ruby还比较陌生，我正在为我正在创建的对象编写一些rspec测试用例。许多测试用例都非常基础，我只是想确保正确填充和返回值。我想知道是否有办法使用循环结构来执行此操作。不必为我要测试的每个方法都设置一个assertEquals。例如:describeitem,"TestingtheItem"doit"willhaveanullvaluetostart"doitem=Item.new#HereIcoulddotheitem.name.shouldbe_nil#thenIcoulddoitem.category.shouldbe_nilendend但我想要一些方法来使用
ruby - i18n Assets 管理/翻译 UI - 2
我正在使用i18n从头开始构建一个多语言网络应用程序，虽然我自己可以处理一大堆yml文件，但我说的语言(非常)有限，最终我想寻求外部帮助帮助。我想知道这里是否有人在使用UI插件/gem(与django上的django-rosetta不同)来处理多个翻译器，其中一些翻译器不愿意或无法处理存储库中的100多个文件，处理语言数据。谢谢&问候，安德拉斯(如果您已经在rubyonrails-talk上遇到了这个问题，我们深表歉意) 最佳答案有一个rails3branchofthetolkgem在github上。您可以通过在Gemfi
python - 如何使用 Ruby 或 Python 创建一系列高音调和低音调的蜂鸣声？ - 2
关闭。这个问题是opinion-based.它目前不接受答案。想要改进这个问题？更新问题，以便editingthispost可以用事实和引用来回答它.关闭4年前。Improvethisquestion我想在固定时间创建一系列低音和高音调的哔哔声。例如:在150毫秒时发出高音调的蜂鸣声在151毫秒时发出低音调的蜂鸣声200毫秒时发出低音调的蜂鸣声250毫秒的高音调蜂鸣声有没有办法在Ruby或Python中做到这一点？我真的不在乎输出编码是什么(.wav、.mp3、.ogg等等)，但我确实想创建一个输出文件。
ruby-on-rails - 如何验证 update_all 是否实际在 Rails 中更新 - 2
给定这段代码defcreate@upgrades=User.update_all(["role=?","upgraded"],:id=>params[:upgrade])redirect_toadmin_upgrades_path,:notice=>"Successfullyupgradeduser."end我如何在该操作中实际验证它们是否已保存或未重定向到适当的页面和消息？最佳答案在Rails3中，update_all不返回任何有意义的信息，除了已更新的记录数(这可能取决于您的DBMS是否返回该信息)。http://ar.ru
ruby-on-rails - 'compass watch' 是如何工作的/它是如何与 rails 一起使用的 - 2
我在我的项目目录中完成了compasscreate.和compassinitrails。几个问题:我已将我的.sass文件放在public/stylesheets中。这是放置它们的正确位置吗？当我运行compasswatch时，它不会自动编译这些.sass文件。我必须手动指定文件:compasswatchpublic/stylesheets/myfile.sass等。如何让它自动运行？文件ie.css、print.css和screen.css已放在stylesheets/compiled。如何在编译后不让它们重新出现的情况下删除它们？我自己编译的.sass文件编译成compiled/t
ruby - 如何将脚本文件的末尾读取为数据文件(Perl 或任何其他语言) - 2
我正在寻找执行以下操作的正确语法(在Perl、Shell或Ruby中):#variabletoaccessthedatalinesappendedasafileEND_OF_SCRIPT_MARKERrawdatastartshereanditcontinues. 最佳答案 Perl用__DATA__做这个:#!/usr/bin/perlusestrict;usewarnings;while(){print;}__DATA__Texttoprintgoeshere 关于ruby-如何将脚
ruby - 如何指定 Rack 处理程序 - 2
Rackup通过Rack的默认处理程序成功运行任何Rack应用程序。例如:classRackAppdefcall(environment)['200',{'Content-Type'=>'text/html'},["Helloworld"]]endendrunRackApp.new但是当最后一行更改为使用Rack的内置CGI处理程序时，rackup给出“NoMethodErrorat/undefinedmethod`call'fornil:NilClass”:Rack::Handler::CGI.runRackApp.newRack的其他内置处理程序也提出了同样的反对意见。例如Rack
ruby - 如何每月在 Heroku 运行一次 Scheduler 插件？ - 2
在选择我想要运行操作的频率时，唯一的选项是“每天”、“每小时”和“每10分钟”。谢谢!我想为我的Rails3.1应用程序运行调度程序。最佳答案这不是一个优雅的解决方案，但您可以安排它每天运行，并在实际开始工作之前检查日期是否为当月的第一天。关于ruby-如何每月在Heroku运行一次Scheduler插件？，我们在StackOverflow上找到一个类似的问题： https://stackoverflow.com/questions/8692687/
ruby-on-rails - 如何从 format.xml 中删除 <hash></hash> - 2
我有一个对象has_many应呈现为xml的子对象。这不是问题。我的问题是我创建了一个Hash包含此数据，就像解析器需要它一样。但是rails自动将整个文件包含在.........我需要摆脱type="array"和我该如何处理？我没有在文档中找到任何内容。最佳答案我遇到了同样的问题；这是我的XML:我在用这个:entries.to_xml将散列数据转换为XML，但这会将条目的数据包装到中所以我修改了:entries.to_xml(root:"Contacts")但这仍然将转换后的XML包装在“联系人”中，将我的XML代码修改为

关于android：如何将Activity绑定到Service并从Activity控制和管理Service

How to bind an Activity to a Service and control and manage the Service from the Activity

有关关于android：如何将Activity绑定到Service并从Activity控制和管理Service的更多相关文章

随机推荐