如何优化我的应用程序以降低电池使用量？

Question

我正在制作一款使用GPS追踪系统的Android应用程序，但它使用了大量电池，如何优化我的应用以降低电池使用量？

Answer 1

您需要配置刷新位置的时间。请参阅以下给定类中的常量。

MIN_TIME_BW_UPDATES和 MIN_DISTANCE_CHANGE_FOR_UPDATES

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
import android.widget.Toast;

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;
    boolean isGPSEnabled = false;
    boolean isNetworkEnabled = false;
    boolean canGetLocation = false;
    Location networklocation; // location
    Location gpslocation; // location
    double latitude; // latitude
    double longitude; // longitude
    float accuracy;
    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
    private static final float HOW_ACCURATE = 50;
    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;        
        getLocation();
    }

    public Location getLocation() {
        float currentAccuracy = HOW_ACCURATE + 1;
        int returnWhat = 0;

        try {
            locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
            isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
            isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {

                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                    Log.d("Network", "Network");
                    if (locationManager != null) {

                        networklocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                        if (networklocation != null) {
                            this.latitude = networklocation.getLatitude();
                            this.longitude = networklocation.getLongitude();
                            currentAccuracy = networklocation.getAccuracy();
                            returnWhat = 1;
                        }
                    }
                }

                if (isGPSEnabled) {
                    if (networklocation == null
                            || currentAccuracy > HOW_ACCURATE) {

                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");

                        if (locationManager != null) {
                            gpslocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (gpslocation != null) {      
                                //Toast.makeText(mContext, "GPS Accuracy: "+gpslocation.getAccuracy()+", Current Accuracy: "+currentAccuracy, Toast.LENGTH_LONG).show();
                                if (gpslocation.getAccuracy() < currentAccuracy) {
                                    this.latitude = gpslocation.getLatitude();
                                    this.longitude = gpslocation.getLongitude();
                                    returnWhat = 2;
                                }
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        if (returnWhat == 1) {
            Toast.makeText(mContext, "Getting location from Network", Toast.LENGTH_LONG).show();
            gpslocation = null;
            this.accuracy = networklocation.getAccuracy();
            return networklocation;
        } else if (returnWhat == 2) {
            Toast.makeText(mContext, "Getting location from GPS", Toast.LENGTH_LONG).show();
            networklocation = null;
            this.accuracy = gpslocation.getAccuracy();
            return gpslocation;
        } else {
            return null;
        }
    }

    public float getLocAccuracy() {
        return this.accuracy;
    }


    public void stopUsingGPS() {
        if (locationManager != null) {
            locationManager.removeUpdates(GPSTracker.this);
        }
    }

    public double getLatitude() {               
        return this.latitude;
    }

    public double getLongitude() {
        return this.longitude;
    }

    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog
                .setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent(
                                Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        mContext.startActivity(intent);
                    }
                });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

Answer 2

这真的取决于你的情况。

你需要考虑＆＃34;减少＆＃34;您的应用中的GPS使用量尽可能与您的功能成比例。

例如，如果您的应用程序只需要发送跟踪＆＃34;点＆＃34;设备到服务器 - 您可以转动GPS，获取当前位置＆＃34;快照＆＃34;然后关掉GPS或暂停它等等......

你的问题没有通用的解决方案，你需要在这里做一点思考:)。