我有问题AsyncTask使它在Android 4.4或更高版本中工作但不在4.0中
邮寄我使用
public class Mailing {
Message message;
Properties props;
String ss,file,locationpre="\"https://www.google.com/maps/@";
Context c;
Mailing(Context context)
{
c=context;
}
public void sending(String s)
{
final LocationManager locationManager = (LocationManager) c.getSystemService(Context.LOCATION_SERVICE);
file=s;
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
locationpre=locationpre+location.getLatitude()+","+location.getLongitude()+",12z";
ss="Lat : "+location.getLatitude()+" , Long : "+location.getLongitude();
Log.d("lat",""+location.getLatitude());
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
try {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
catch (Exception e)
{
e.printStackTrace();
}
new Thread(new Runnable() {
@Override
public void run() {
try {
new SendMail().execute();
} catch (Exception e) {
Log.e("SendMail", e.getMessage(), e);
}
}
}).start();
}
public class SendMail extends AsyncTask<Void,Void,Void>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
}
@Override
protected Void doInBackground(Void... params) {
final String username = "iamzeus07";
final String password = "sumanthkumar";
props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");
Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
message = new MimeMessage(session);
try {
String rrr="https://www.google.com/maps/@-15.623037,18.388672,12z";
message.setFrom(new InternetAddress("iamzeus07@gmail.com"));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse("kishlayrajiem@gmail.com"));
message.setSubject("URGENT XYZ IS IN DANGER");
BodyPart bodyPart1 = new MimeBodyPart();
bodyPart1.setText("HER location : " + locationpre+" and "+ss);
BodyPart bodyPart2 = new MimeBodyPart();
Log.d("mail", "part 1");
String filename = file;
DataSource source = new FileDataSource(filename);
bodyPart2.setDataHandler(new DataHandler(source));
bodyPart2.setFileName(filename);
Log.d("mail", "part 2");
message.setText("Dear Mail Crawler,"
+ "\n\n No spam to my email, please!");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(bodyPart1);
multipart.addBodyPart(bodyPart2);
Log.d("mail", "part 3");
message.setContent(multipart);
Log.d("mail", "part 4");
Transport.send(message);
Log.d("mail", "part 5");
}
catch (Exception e)
{
Log.d("mail","Unsuccessful");
e.printStackTrace();
}
return null;
}
}
}
并且logcat说
11-22 23:34:20.029 24637-25096/github.bewantbe.screamDetector W/dalvikvm: Exception Ljava/lang/RuntimeException; thrown while initializing Landroid/os/AsyncTask;
11-22 23:34:20.029 24637-25096/github.bewantbe.screamDetector W/dalvikvm: threadid=12: thread exiting with uncaught exception (group=0x2b542210)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: FATAL EXCEPTION: Thread-1132
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: java.lang.ExceptionInInitializerError
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at github.bewantbe.screamDetector.Mailing$2.run(Mailing.java:101)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at java.lang.Thread.run(Thread.java:856)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at android.os.Handler.<init>(Handler.java:121)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:607)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:607)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at android.os.AsyncTask.<clinit>(AsyncTask.java:190)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at github.bewantbe.screamDetector.Mailing$2.run(Mailing.java:101)
11-22 23:34:20.039 24637-25096/github.bewantbe.screamDetector E/AndroidRuntime: at java.lang.Thread.run(Thread.java:856)
11-22 23:34:20.219 24637-24637/github.bewantbe.screamDetector D/OpenGLRenderer: Flushing caches (mode 0)
答案 0 :(得分：0)
AsyncTask来执行后台操作。因此，创建一个要执行的新线程会给你错误。
替换
new Thread(new Runnable() {
@Override
public void run() {
try {
new SendMail().execute();
} catch (Exception e) {
Log.e("SendMail", e.getMessage(), e);
}
}
}).start();
与
new SendMail().execute();
请告诉我这是否有帮助！
答案 1 :(得分：0)