设备关闭时的 IntentService onHandleIntent 行为

IntentService onHandleIntent behaviour on device shutdown

设备关闭时 onHandleIntent 的行为是什么?

我知道在 IntentService 上,只要 onHandleIntent 没有完成它的工作,服务就会保持 运行。

所以开始考虑它是关于设备关闭时服务行为的一般问题,一旦我们再次启动设备,它们会 "wake" 启动吗?

如果没有,有办法吗?我希望我的 intentservice 保持 运行 直到 onHandleIntent 完成,无论发生什么。

编辑: 我将添加我的代码以便更好地理解。 我试图在 SQLite 上保存请求并保持 运行 直到 table 为空,然后服务将关闭。 所以万一设备关机,我仍然会从关机前的同一个地方继续。 P.S - 我尝试使用 executor 以获得更好的性能(这是一个测试,尚未证明) 如果有人有更好的建议,我很乐意听取他们的意见,因为我是这个主题的新手

onHandleIntent

@Override
protected void onHandleIntent(Intent intent) {
    helper = new DBHelper(getApplicationContext());
    executor = Executors.newFixedThreadPool(5);
    File file;
    Log.e("requestsExists",helper.requestsExists()+"");
    while (helper.requestsExists()) {
        ArrayList<String> requestArr = helper.getRequestsToExcute(5);
        //checks if the DB requests exists
        if (!requestArr.isEmpty()) {
            //execute them and delete the DB entry
            for(int i = 0; i < requestArr.size(); i++) {
                file = new File(requestArr.get(i));

                Log.e("file",file.toString());
                Future<String> future = executor.submit(new MyThread(file,getApplicationContext()));

                Log.e("future object", future.toString());
                try {
                    long idToDelete = Long.parseLong(future.get());
                    Log.e("THREAD ANSWER", future.get() + "");
                    helper.deleteRequest(idToDelete);
                } catch (InterruptedException e) {
                    Log.e("future try", "");
                } catch (ExecutionException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    executor.shutdown();
}

我的线程

public class MyThread implements Callable {

    private File _file;
    private Context context;
    private DBHelper helper;

    public MyThread(File file, Context context) {
        this._file = file;
        this.context = context;
    }

    @Override
    public String call() throws Exception {
        HttpClient client = Utility.getNewHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost post = new HttpPost("http://192.168.9.62/mobile_api/timeline/moment/upload");
        try {
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

            FileBody fileBody = new FileBody(_file);
            builder.addPart("content", fileBody);
            builder.addPart("type", new StringBody("file", ContentType.TEXT_PLAIN));
            builder.addPart("title", new StringBody("service test", ContentType.TEXT_PLAIN));
            builder.addPart("userType", new StringBody("user", ContentType.TEXT_PLAIN));
            builder.addPart("uid", new StringBody(MyInfiActivity.friends_uid, ContentType.TEXT_PLAIN));
            builder.addPart("momentId", new StringBody("1", ContentType.TEXT_PLAIN));
            builder.addPart("storyId", new StringBody("8", ContentType.TEXT_PLAIN));
            Utility.addCookiesToPost(post);

            post.setEntity(builder.build());
            client.execute(post, localContext);
        } catch (IOException e) {
            Log.e("Callable try", post.toString());
        }
        return "1";
    }
}

我会尽量逐条回答你的问题

设备关闭时 onHandleIntent 的行为是什么?

由于设备将完全关闭,所有服务都将被强制停止,包括您的 IntentService。
您可以订阅 ACTION_SHUTDOWN 以了解设备何时关闭并在它真正关闭之前做一些事情。

public class ShutdownHandlerReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //Handle here, but don't make actions that takes too long
    }    
}

此外,您还必须将其添加到清单中

<receiver android:name=".ShutdownHandlerReceiver">
  <intent-filter>
    <action android:name="android.intent.action.ACTION_SHUTDOWN" />
  </intent-filter>
</receiver>

一旦我们再次启动设备,它们会"wake"吗?

不,他们不会,因为他们已经处理过类似的东西,但您可以订阅 ACTION_BOOT_COMPLETED 以了解设备何时准备就绪。来自文档:

Broadcast Action: This is broadcast once, after the system has finished booting. It can be used to perform application-specific initialization, such as installing alarms. You must hold the RECEIVE_BOOT_COMPLETED permission in order to receive this broadcast.

   public class BootedReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //Handle here, you can start again your stopped intentservices
    }    
}

并且在清单中:

<receiver android:name=".BootedReceiver">
  <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
  </intent-filter>
</receiver>

然后您可以重新启动意向服务队列,我想这是最好的方法。

AFAIK,如果当时 运行 设备关闭,您的 IntentService 将停止,系统不会在启动时自动为我们启动它,我们必须自己做。

有关操作方法,请参阅 this