enable GPS - Android Hardware

Android examples for Hardware:Gps

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Description

enable GPS

Demo Code


//package com.java2s;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

import android.net.Uri;
import android.provider.Settings;
import android.util.Log;

public class Main {
    private static final String LOG_TAG = "Geo Utils";

    /**//from  ww w .  ja va 2 s  . c  o m
     * @param activity
     * @return true if GPS could be enabled without user interaction, else the
     *         settings will be started and false is returned
     */
    public static boolean enableGPS(Activity activity) {
        return switchGPS(activity, true, true);
    }

    /**
     * @param activity
     * @param enableGPS
     * @param showSettingsIfAutoSwitchImpossible
     * @return true if GPS could be switched to the desired value without user
     *         interaction, else the settings will be started and false is
     *         returned
     */
    public static boolean switchGPS(Activity activity, boolean enableGPS,
            boolean showSettingsIfAutoSwitchImpossible) {
        if (canTurnOnGPSAutomatically(activity)) {
            String provider = Settings.Secure.getString(
                    activity.getContentResolver(),
                    Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
            boolean currentlyEnabled = provider.contains("gps");
            if (!currentlyEnabled && enableGPS) {
                pokeGPSButton(activity);
            } else if (currentlyEnabled && !enableGPS) {
                pokeGPSButton(activity);
            }
            return true;
        } else if (showSettingsIfAutoSwitchImpossible) {
            Log.d(LOG_TAG, "Can't enable GPS automatically, will start "
                    + "settings for manual enabling!");
            openLocationSettingsPage(activity);
        }
        return false;
    }

    /**
     * source from
     * http://stackoverflow.com/questions/4721449/enable-gps-programatically
     * -like-tasker
     */
    private static boolean canTurnOnGPSAutomatically(Context c) {
        PackageInfo pacInfo = null;
        try {
            pacInfo = c.getPackageManager().getPackageInfo(
                    "com.android.settings", PackageManager.GET_RECEIVERS);
        } catch (NameNotFoundException e) {
            Log.e(LOG_TAG, "com.android.settings package not found");
            return false; // package not found
        }
        if (pacInfo != null) {
            for (ActivityInfo actInfo : pacInfo.receivers) {
                // test if recevier is exported. if so, we can toggle GPS.
                if (actInfo.name
                        .equals("com.android.settings.widget.SettingsAppWidgetProvider")
                        && actInfo.exported) {
                    return true;
                }
            }
        }
        return false; // default
    }

    private static void pokeGPSButton(Activity activity) {
        final Intent poke = new Intent();
        poke.setClassName("com.android.settings",
                "com.android.settings.widget.SettingsAppWidgetProvider");
        poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
        poke.setData(Uri.parse("3"));
        activity.sendBroadcast(poke);
    }

    public static void openLocationSettingsPage(Activity activity) {
        activity.startActivity(new Intent(
                android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
    }
}

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