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我希望從GPS和其他傳感器讀取數據並將其寫入文件。我能夠做到這一點的加速度計，但不能夠實現GPS的部分，因爲我是新來的android。請以簡單的步驟解釋我如何做到這一點。這裏是我有的代碼：將GPS數據保存到Android中的文件
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.Uri;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
import com.opencsv.CSVWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class MainActivity extends AppCompatActivity implements SensorEventListener {
private SensorManager mSensorManager;
private Sensor mSensor;
private static String TAG = "PermissionDemo";
private static final int REQUEST_WRITE_STORAGE = 112;
TextView xval;
TextView yval;
TextView zval;
TextView av;
float axisX;
float axisY;
float axisZ;
float gyX;
float gyY;
float gyZ;
TextView gxval;
TextView gyval;
TextView gzval;
int click = 0;
String entry = "";
String Gyentry = "";
//GPS
protected String mLatitudeLabel;
protected String mLongitudeLabel;
protected TextView mLatitudeText;
protected TextView mLongitudeText;
LocationManager mLocationManager;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
//Toast.makeText(getApplicationContext(),"ACTIVITY SENSING PROJECT", Toast.LENGTH_LONG).show();
xval = (TextView) findViewById(R.id.tv1);
yval = (TextView) findViewById(R.id.tv2);
zval = (TextView) findViewById(R.id.tv3);
gxval = (TextView) findViewById(R.id.tv4);
gyval = (TextView) findViewById(R.id.tv5);
gzval = (TextView) findViewById(R.id.tv6);
av = (TextView) findViewById(R.id.addressview);
av.setText("File Path will be displayed here.");
//GPS
mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mSensor, 2000000000);
mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE), 5 * 60 * 1000);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mLocationListener);
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("Main Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
@Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
AppIndex.AppIndexApi.start(client, getIndexApiAction());
}
@Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
AppIndex.AppIndexApi.end(client, getIndexApiAction());
client.disconnect();
}
public class LocationListener implements android.location.LocationListener {
final String LOG_LABEL = "Location Listener>>";
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, LOG_LABEL + "Location Changed");
if (location != null) {
double longitude = location.getLongitude();
Log.d(TAG, LOG_LABEL + "Longitude:" + longitude);
Toast.makeText(getApplicationContext(), "Long::" + longitude, Toast.LENGTH_SHORT).show();
double latitude = location.getLatitude();
Toast.makeText(getApplicationContext(), "Lat::" + latitude, Toast.LENGTH_SHORT).show();
Log.d(TAG, LOG_LABEL + "Latitude:" + latitude);
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE) {
return;
}
Sensor sensor = event.sensor;
if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
axisX = event.values[0];
axisY = event.values[1];
axisZ = event.values[2];
//Log.d(Float.toString(axisX),"yes");
xval.setText("X : " + Float.toString(axisX));
yval.setText("Y : " + Float.toString(axisY));
zval.setText("Z : " + Float.toString(axisZ));
if (click == 1) {
Log.d("starting data entry", "Accelerometer Sensor");
entry = entry + Float.toString(axisX) + "," + Float.toString(axisY) + "," + Float.toString(axisZ) + "\n";
//Log.d("entry ", entry);
try {
accWriteTOCSV(Float.toString(axisX), Float.toString(axisY), Float.toString(axisZ));
} catch (IOException e) {
e.printStackTrace();
}
}
} else if (sensor.getType() == Sensor.TYPE_GYROSCOPE) {
gyX = event.values[0];
gyY = event.values[1];
gyZ = event.values[2];
gxval.setText("X : " + Float.toString(gyX));
gyval.setText("Y : " + Float.toString(gyY));
gzval.setText("Z : " + Float.toString(gyZ));
if (click == 1) {
Log.d("starting data entry", "Gyroscope Sensor");
Gyentry = Gyentry + Float.toString(gyX) + "," + Float.toString(gyZ) + "," + Float.toString(gyZ) + "\n";
//Log.d("entry ", entry);
try {
gyroWriteToCSV(Float.toString(gyX), Float.toString(gyY), Float.toString(gyZ));
} catch (IOException e) {
e.printStackTrace();
}
}
}
//Toast.makeText(getApplicationContext(), "hey", Toast.LENGTH_LONG).show();
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
/*
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
*/
public void onclickstart(View v) throws IOException {
Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
click = 1;
//file handling put here
}
public void onclickstop(View v) throws IOException {
click = 0;
Toast.makeText(getApplicationContext(), "Recording stopped", Toast.LENGTH_LONG).show();
//mSensorManager.unregisterListener(this);
//super.onStop();
}
public void gyroWriteToCSV(String x, String y, String z) throws IOException {
Calendar c = Calendar.getInstance();
File folder = new File(Environment.getExternalStorageDirectory() + "/activitySensing");
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
if (success) {
String dataEntry = folder + "/gyroSensor.csv";
try {
FileWriter file_writer = new FileWriter(dataEntry, true);
String data = c.get(Calendar.MONTH) + ";" + c.get(Calendar.DATE) + ";" + c.get(Calendar.HOUR) + ";" + c.get(Calendar.MINUTE) + ";" + x + ";" + y + ";" + z + "\n";
file_writer.append(data);
file_writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void accWriteTOCSV(String x, String y, String z) throws IOException {
Calendar c = Calendar.getInstance();
File folder = new File(Environment.getExternalStorageDirectory() + "/activitySensing");
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
if (success) {
String dataEntry = folder + "/accSensor.csv";
try {
FileWriter file_writer = new FileWriter(dataEntry, true);
String data = c.get(Calendar.MONTH) + ";" + c.get(Calendar.DATE) + ";" + c.get(Calendar.HOUR) + ";" + c.get(Calendar.MINUTE) + ";" + x + ";" + y + ";" + z + "\n";
file_writer.append(data);
file_writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location loc) {
Toast.makeText(getBaseContext(), "Location changed : Lat: " +
loc.getLatitude() + " Lng: " + loc.getLongitude(),
Toast.LENGTH_SHORT).show();
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
String s = longitude + "\n" + latitude;
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider,
int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
/*@Override
public void onSensorChanged(SensorEvent event) {
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}*/
}
}