我正在尝试创建一个包含服务的应用程序，该服务在设备启动时启动，然后记录一些事件。
manifest.xml中的服务条目
<receiver android:name="com.myservices.BReceiver" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.HOME" />
</intent-filter>
</receiver>
<service android:name="com.myservices.MyService" >
</service>
BReceiver.java
public class BReceiver extends BroadcastReceiver {
private static final String TAG = "BReceiver";
@Override
public void onReceive(Context context, Intent intent) {
Log.e(TAG, "onReceive started");
// Main Logging Service
Intent service = new Intent(context, MyService.class);
context.startService(service);
Log.e(TAG, "onReceive ended");
}
}
MService.class
public class MyService extends IntentService {
private static final String TAG = "MyService";
private static final long TIMER = 2000;
public MyService() {
super("MyService");
}
@Override
protected void onHandleIntent(Intent intent) {
startLogginThread();
}
/**
* For logging
*/
private void startLogginThread() {
Thread thread = new Thread() {
public void run() {
while (true) {
try {
// Logging events
myLogger();
Log.e(TAG, "Awake");
// TIMER
Thread.sleep(TIMER);
} catch (Exception e) {
Log.e("MyService", "local Thread error "+ e.toString());
}
}
}
};
thread.start();
}
private void myLogger() {
// Creating new file to store logs.
// Check if SD card is available else use internal memory.
File dir = null;
if (MyServiceUtil.isExternalStorageReadable() && MyServiceUtil.isExternalStorageWritable()) {
// External Memory
File sdCard = Environment.getExternalStorageDirectory();
dir = new File(sdCard.getAbsolutePath() + "/MyLogger");
dir.mkdirs();
} else {
// Internal Memory
dir = getFilesDir();
}
// Rename to txt for reading
File file = new File(dir, "log.txt");
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
Log.e(TAG, "Exception :" + e.toString());
}
}
// Printing timestamp in file
try {
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(file, true)));
String timeStamp = new SimpleDateFormat("dd.MM.yyyy '-' HH:mm:ss").format(Calendar.getInstance().getTime());
out.println(timeStamp);
// Log Location
out.close();
Log.e("Logggging", timeStamp);
} catch (IOException e) {
Log.e(TAG, "Exception :" + e.toString());
}
}
@Override
public void onDestroy() {
Log.e(TAG, "onDestroy called");
super.onDestroy();
}
}
结果：
只有几次，如6到7次，日志被打印并存储在文件中。
下面是日志：
11-16 17:00:02.438: E/BReceiver(3187): onReceive started
11-16 17:00:02.438: E/BReceiver(3187): onReceive ended
11-16 17:00:02.458: E/MyService(3187): onDestroy called
11-16 17:00:02.458: D/MyServiceUtil(3187): isExternalStorageReadable started
11-16 17:00:02.468: D/MyServiceUtil(3187): isExternalStorageWritable started
11-16 17:00:02.468: E/Logggging(3187): 16.11.2014 - 17:00:02
11-16 17:00:02.468: E/MyService(3187): Awake
11-16 17:00:04.468: D/MyServiceUtil(3187): isExternalStorageReadable started
11-16 17:00:04.468: D/MyServiceUtil(3187): isExternalStorageWritable started
11-16 17:00:04.478: E/Logggging(3187): 16.11.2014 - 17:00:04
11-16 17:00:04.478: E/MyService(3187): Awake
11-16 17:00:06.478: D/MyServiceUtil(3187): isExternalStorageReadable started
11-16 17:00:06.488: D/MyServiceUtil(3187): isExternalStorageWritable started
11-16 17:00:06.488: E/Logggging(3187): 16.11.2014 - 17:00:06
11-16 17:00:06.488: E/MyService(3187): Awake
11-16 17:00:08.488: D/MyServiceUtil(3187): isExternalStorageReadable started
11-16 17:00:08.488: D/MyServiceUtil(3187): isExternalStorageWritable started
11-16 17:00:08.488: E/Logggging(3187): 16.11.2014 - 17:00:08
11-16 17:00:08.488: E/MyService(3187): Awake
另外，如果线程已经在运行，我不明白为什么调用onDestroy：
11-16 17：00：02.458：E / MyService（3187）：onDestroy被调用
PS-这仅在Kitkat中发生。
最佳答案
您对IntentService不太了解。 onHandleIntent的方法是在框架启动的子线程中调用的，当onHandleIntent完成时，该服务将自行终止，因此原因是您将作业放在了启动的新线程中。因此，您应该将代码放入onHandleIntent中。
while (true) {
try {
// Logging events
myLogger();
Log.e(TAG, "Awake");
// TIMER
Thread.sleep(TIMER);
} catch (Exception e) {
Log.e("MyService", "local Thread error "+ e.toString());
}
}