我无法解决错误。无法在线程Looper.prepare（）内创建处理程序。我为什么得到它？
trip.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//timer = 30;
try {
timer = Integer.parseInt(time.getText().toString());
} catch (NumberFormatException e) {
// Toast.makeText(getApplicationContext(), "Invalid Time!", Toast.LENGTH_LONG).show();
startActivity(new Intent(MainActivity.this, MainActivity.class));
}
Log.d("tag", "Timer set");
if (!flag1) {
trip.setText("End Trip");
Log.d("tag", "End Trip has been set");
flag1 = true;
timer1.schedule(new myTimerTask(), 0, timer * 60 * 1000);
} else {
timer1.cancel();
// Toast.makeText(getApplicationContext(), "Trip Ended..Thank You!!", Toast.LENGTH_LONG).show();
finish();
}
}
});
}
public class myTimerTask extends TimerTask {
LocationListener locationListener;
Handler handler;
@Override
public void run() {
Location gpsLocation = null;
final LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
final boolean isActive = true;
final long time = timer * 60 * 1000;
final float distance = 1;
/* if (locationManager != null) {
gpsLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
else{
gpsLocation=null;
}*/
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (isActive)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, time, distance, locationListener);
super.handleMessage(msg);
}
};
locationListener = new myLocationListener(handler);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, time, distance, locationListener);
LocationAddress locationAddress=new LocationAddress();
locationAddress.getAddressFromLocation(getApplicationContext(),number.getText().toString(),timer,gpsLocation);
}
}
class myLocationListener implements LocationListener{
Handler handler;
public myLocationListener(Handler handler)
{
this.handler=handler;
}
@Override
public void onLocationChanged(Location location) {
Thread thread=new Thread(new Runnable()
{
@Override
public void run()
{
Message msg=Message.obtain();
handler.sendMessageDelayed(msg,1000);
}
});`
thread.run();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
错误是：
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:197)
at android.os.Handler.<init>(Handler.java:111)
at com.mycompany.s.MainActivity$myTimerTask$1.<init>(MainActivity.java:110)
at com.mycompany.s.MainActivity$myTimerTask.run(MainActivity.java:110)
at java.util.Timer$TimerImpl.run(Timer.java:284)