我正在尝试从发送消息,但Service
收到错误消息
com.spynetstation.MediaService.notif(MediaService.java:162)出错
指向Service
:
Intent notificationIntent = new Intent(ctx, MediaService.class);
服务:
public class MediaService extends Service implements OnPreparedListener,OnCompletionListener{
static MediaPlayer mediaPlayer;
static NotificationManager nm;
private static NotificationCompat.Builder mBuilder;
static Context ctx;
static String dataPlaying = null;
static String soursetrack = null;
static TimerTask repeatTask;
static Timer t;
Node node;
static String filePath;
static File file;
String titleNotif = "Station";
String contentNotif = "Running";
public IBinder onBind(Intent paramIntent) {
return null;
}
public static void initMP(String urlStream){
try {
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(urlStream);
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.prepareAsync();
Log.d("MediaService", "prepareAsync");
}
public static void startMP(){
mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
Log.d("MediaService", "start");
MainActivity.visible();
if (MainActivity.track) {} else {doRepeatTask();}
}
});
}
public static void stopMP() {
if (mediaPlayer != null) {
try {
mediaPlayer.stop();
Log.d("MediaService", "stop");
if (MainActivity.track) {} else {stopRepeatTask();}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void releaseMP() {
if (mediaPlayer != null) {
try {
mediaPlayer.release();
Log.d("MediaService", "release");
mediaPlayer = null;
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Override
public void onCompletion(MediaPlayer mp) {
Log.d("MediaService", "onCompletion");
}
@Override
public void onPrepared(MediaPlayer mp) {
Log.d("MediaService", "onPrepareed");
}
public void onCreate() {
super.onCreate();
// tried the following ctx=getBaseContext(); did not help
ctx = getApplicationContext();
this.nm = ((NotificationManager)getSystemService("notification"));
}
public void onDestroy() {
this.nm.cancelAll();
stopForeground(true);
}
public int onStartCommand(Intent paramIntent, int paramInt1, int paramInt2) {
try {
TimeUnit.SECONDS.sleep(0);
notif(titleNotif, contentNotif);
return super.onStartCommand(paramIntent, paramInt1, paramInt2);
} catch (InterruptedException localInterruptedException) {
for (;;) {
localInterruptedException.printStackTrace();
}
}
}
public static void notif(String titleNotif, String contentNotif){
//building the notification
mBuilder = new NotificationCompat.Builder(ctx)
.setSmallIcon(R.drawable.spy)
.setContentTitle(titleNotif)
.setTicker(contentNotif);
Intent notificationIntent = new Intent(ctx, MediaService.class);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(ctx, 0,
notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
mBuilder.setContentIntent(pendingIntent);
Notification n = mBuilder.build();
nm.notify(1, n);
// startForeground(12345, mBuilder.build());
}
public static void doRepeatTask(){
t = new Timer();
repeatTask = new TimerTask() {
public void run() {
new Task().execute();
}
};
t.schedule(repeatTask, 300, 3000);
}
public static void stopRepeatTask(){
if(repeatTask!=null){
repeatTask.cancel();
Log.d("TIMER", "timer canceled");
}
MainActivity.titleMusic.setText("");
MainActivity.titleMusic.setVisibility(View.GONE);
}
public static class Task extends AsyncTask<Void, Void, Void>{
@Override
protected Void doInBackground(Void... arg0) {
try {
URL url = new URL(soursetrack);
URLConnection connection = url.openConnection();
InputStream in = connection.getInputStream();
filePath = Environment.getExternalStorageDirectory().getAbsolutePath()
+ "/cashe.xml";
file = new File (filePath);
CreateFileFromInputStream(in, filePath) ;
// Parse it with document builder factory
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = null;
dBuilder = dbFactory.newDocumentBuilder();
Document doc = null;
doc = dBuilder.parse(file);
doc.getDocumentElement().normalize();
// The root element is
doc.getDocumentElement().getNodeName();
NodeList nList = doc.getElementsByTagName("Name");
for ( int i = 0 ; i < nList.getLength() ; i++ ) {
Element element = (Element) nList.item(i) ;
dataPlaying = getCharacterDataFromElement(element);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
if (dataPlaying.equals(MainActivity.currentlyPlaying)){
if (MainActivity.replay == true){
MainActivity.replay = false;
MainActivity.titleMusic.setText("" + MainActivity.currentlyPlaying);
}
} else {
Log.d("MainActivity","Change track");
MainActivity.currentlyPlaying = dataPlaying;
MainActivity.titleMusic.setText("" + MainActivity.currentlyPlaying);
send();
}
super.onPostExecute(result);
}
}
public static void send(){
notif(MainActivity.currentlyPlaying,MainActivity.currentlyPlaying);
}
public static String getCharacterDataFromElement(Element e) {
Node node = e.getFirstChild();
if (node instanceof CharacterData) {
CharacterData cd = (CharacterData) node;
return cd.getData();
}
return "";
}
public static void CreateFileFromInputStream(InputStream inStream, String path)
throws IOException {
// write the inputStream to a FileOutputStream
OutputStream out = new FileOutputStream(new File(path));
int read = 0;
byte[] bytes = new byte[1024];
while ((read = inStream.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
inStream.close();
out.flush();
out.close();
}
}
LogCat:
03-12 06:16:21.324: D/MediaService(3475): Change track
03-12 06:16:21.347: D/AndroidRuntime(3475): Shutting down VM
03-12 06:16:21.347: W/dalvikvm(3475): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
03-12 06:16:21.394: E/AndroidRuntime(3475): FATAL EXCEPTION: main
03-12 06:16:21.394: E/AndroidRuntime(3475): java.lang.NullPointerException
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.content.ComponentName.<init>(ComponentName.java:75)
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.content.Intent.<init>(Intent.java:3122)
03-12 06:16:21.394: E/AndroidRuntime(3475): at com.spynetstation.MediaService.notif(MediaService.java:162)
03-12 06:16:21.394: E/AndroidRuntime(3475): at com.spynetstation.MediaService.send(MediaService.java:250)
03-12 06:16:21.394: E/AndroidRuntime(3475): at com.spynetstation.MediaService$Task.onPostExecute(MediaService.java:241)
03-12 06:16:21.394: E/AndroidRuntime(3475): at com.spynetstation.MediaService$Task.onPostExecute(MediaService.java:1)
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.os.AsyncTask.finish(AsyncTask.java:602)
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.os.AsyncTask.access$600(AsyncTask.java:156)
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.os.Handler.dispatchMessage(Handler.java:99)
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.os.Looper.loop(Looper.java:137)
03-12 06:16:21.394: E/AndroidRuntime(3475): at android.app.ActivityThread.main(ActivityThread.java:4424)
03-12 06:16:21.394: E/AndroidRuntime(3475): at java.lang.reflect.Method.invokeNative(Native Method)
03-12 06:16:21.394: E/AndroidRuntime(3475): at java.lang.reflect.Method.invoke(Method.java:511)
03-12 06:16:21.394: E/AndroidRuntime(3475): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-12 06:16:21.394: E/AndroidRuntime(3475): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-12 06:16:21.394: E/AndroidRuntime(3475): at dalvik.system.NativeStart.main(Native Method)
我认为是context
。
代替ctx=this
,
您可以使用服务getApplicationContext()
或getBaseContext()
在服务内部获取上下文。
尝试使用
ctx= getApplicationContext();
要么
Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);
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我来说两句