1
我應該每隔5秒更新一次偵聽器。但事實並非如此。我的代碼有什麼問題？每5秒更新一次GPS偵聽器
非常感謝您的幫助！
package com.example.android.lbs;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.sql.Date;
import java.text.SimpleDateFormat;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class LbsGeocodingActivity extends Activity {
public static final String LOG_TAG = "<<< ------------ >>> GeocodingActivity <<< ------------ >>>";
TextView tv;
int ScreenOutputCount;
String newTrip;
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 0; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 5000; // in Milliseconds, 5 secconds
protected LocationManager lm;
MyLocationListener locationL = new MyLocationListener();
protected Button retrieveLocationButton;
//Log.e(LOG_TAG, e.toString());
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
try {
View.OnClickListener handler = new View.OnClickListener(){
public void onClick(View v) {
//we will use switch statement and just
//get thebutton's id to make things easier
switch (v.getId()) {
case R.id.trip_start:
tripStart();
break;
case R.id.trip_end:
tripEnd();
break;
}
}
};
//we will set the listeners
findViewById(R.id.trip_start).setOnClickListener(handler);
findViewById(R.id.trip_end).setOnClickListener(handler);
}catch(Exception e){
Log.e("Android Button Tutorial", e.toString());
}
}
public void tripStart(){
File originalDirectories = new File(Environment.getExternalStorageDirectory() + "/Android/GpsTracker/");
if(!originalDirectories.exists()){
originalDirectories.mkdirs();
}
LbsGeocodingActivity.this.newTrip = getNewFileName();
LbsGeocodingActivity.this.ScreenOutputCount = 1;
LbsGeocodingActivity.this.tv = (TextView) this.findViewById(R.id.thetext);
LbsGeocodingActivity.this.tv.setText("Location Updates: \n");
LbsGeocodingActivity.this.lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LbsGeocodingActivity.this.lm.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
this.locationL
);
Toast.makeText(getBaseContext(), "New Trip Started.", Toast.LENGTH_SHORT).show();
}
public String getNewFileName(){
SimpleDateFormat sdfDateTime = new SimpleDateFormat("yyyyMMddHHmmss");
return sdfDateTime.format(new Date(System.currentTimeMillis()));
}
public void tripEnd(){
LbsGeocodingActivity.this.lm.removeUpdates(this.locationL);
Toast.makeText(getBaseContext(), "Trip Ended.", Toast.LENGTH_SHORT).show();
}
protected void showCurrentLocation() {
try{
Location location = LbsGeocodingActivity.this.lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
String show_curent = "Longitude: " + location.getLongitude()
+ " | Latitude: " + location.getLatitude();
//LbsGeocodingActivity.this.tv.append(show_curent);
Toast.makeText(getBaseContext(), show_curent, Toast.LENGTH_SHORT).show();
//LbsGeocodingActivity.this.ScreenOutputCount = LbsGeocodingActivity.this.ScreenOutputCount + 1;
}else{
Toast.makeText(getBaseContext(), "Last Know Location Not Found.", Toast.LENGTH_SHORT).show();
}
}catch(NullPointerException e){
Log.e("Android Button Tutorial", e.toString());
}
}
private class MyLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
LbsGeocodingActivity.this.tv.append(LbsGeocodingActivity.this.ScreenOutputCount
+ " | Longitude: " + location.getLongitude()
+ " | Latitude: " + location.getLatitude() + "\n");
LbsGeocodingActivity.this.ScreenOutputCount = LbsGeocodingActivity.this.ScreenOutputCount + 1;
logLocationUpdate(location.getLongitude(), location.getLatitude());
}
public void logLocationUpdate(double longitude, double latitude){
try {
SimpleDateFormat sdfDateTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String timestamp = sdfDateTime.format(new Date(System.currentTimeMillis()));
String logString = timestamp + "::" +
longitude + "::" +
latitude + "\n";
String sdcard = Environment.getExternalStorageDirectory() + "/Android/GpsTracker/";
//then write the file
final String TESTSTRING = new String(logString);
File gpxfile = new File(sdcard, LbsGeocodingActivity.this.newTrip + ".txt");
FileWriter gpxwriter = new FileWriter(gpxfile, true);
BufferedWriter out = new BufferedWriter(gpxwriter);
out.write(TESTSTRING);
out.close();
}catch(Exception e){
Log.e("GPS Tracker", e.getMessage());
}
}
public void onStatusChanged(String s, int i, Bundle b) {
/*
Toast.makeText(LbsGeocodingActivity.this, "Provider status changed",
Toast.LENGTH_LONG).show();
*/
}
public void onProviderDisabled(String s) {
Toast.makeText(LbsGeocodingActivity.this,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String s) {
Toast.makeText(LbsGeocodingActivity.this,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_LONG).show();
}
}
}