Code cleanup, move google location settings logic to GoogleLocationUtils

MyTracks/src/com/google/android/apps/mytracks/util/GoogleLocationUtils.java

@@ -18,11 +18,15 @@ package com.google.android.apps.mytracks.util;
 
 import com.google.android.maps.mytracks.R;
 
+import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
+import android.database.Cursor;
+import android.net.Uri;
 import android.provider.Settings;
+import android.util.Log;
 
 /**
  * Utilities for Google location settings
@@ -31,17 +35,48 @@ import android.provider.Settings;
  */
 public class GoogleLocationUtils {
 
+  private static final String TAG = GoogleLocationUtils.class.getSimpleName();
+
+  // Action to launch the google location settings
   private static final String
       ACTION_GOOGLE_LOCATION_SETTINGS = "com.google.android.gsf.GOOGLE_LOCATION_SETTINGS";
+
+  // Action to check if the google apps locations settings exists
   private static final String
       ACTION_GOOGLE_APPS_LOCATION_SETTINGS = "com.google.android.gsf.GOOGLE_APPS_LOCATION_SETTINGS";
 
+  /**
+   * User has disagreed to use location for Google services.
+   */
+  private static final int USE_LOCATION_FOR_SERVICES_OFF = 0;
+
+  /**
+   * User has agreed to use location for Google services.
+   */
+  public static final int USE_LOCATION_FOR_SERVICES_ON = 1;
+
+  /**
+   * The user has neither agreed nor disagreed to use location for Google
+   * services yet.
+   */
+  private static final int USE_LOCATION_FOR_SERVICES_NOT_SET = 2;
+
+  private static final String GOOGLE_SETTINGS_AUTHORITY = "com.google.settings";
+  private static final Uri GOOGLE_SETTINGS_CONTENT_URI = Uri.parse(
+      "content://" + GOOGLE_SETTINGS_AUTHORITY + "/partner");
+  private static final String NAME = "name";
+  private static final String VALUE = "value";
+  private static final String USE_LOCATION_FOR_SERVICES = "use_location_for_services";
+
+  public static final Uri USE_LOCATION_FOR_SERVICES_URI = Uri.parse(
+      "content://" + GOOGLE_SETTINGS_AUTHORITY + "/partner/" + USE_LOCATION_FOR_SERVICES);
+
   private GoogleLocationUtils() {}
 
   /**
-   * Returns true if the Google location settings is available.
+   * Returns true if the Google location settings is enforceable.
    */
-  public static boolean isAvailable(Context context) {
+  public static boolean isEnforceable(Context context) {
     Intent intent = new Intent(ACTION_GOOGLE_APPS_LOCATION_SETTINGS);
     ResolveInfo resolveInfo = context.getPackageManager()
         .resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
@@ -54,7 +89,7 @@ public class GoogleLocationUtils {
    * @param context the context
    */
   public static String getLocationSettingsName(Context context) {
-    return context.getString(isAvailable(context) ? R.string.gps_google_location_settings
+    return context.getString(isEnforceable(context) ? R.string.gps_google_location_settings
         : R.string.gps_location_access);
   }
 
@@ -64,10 +99,58 @@ public class GoogleLocationUtils {
    * @param context the context
    */
   public static Intent newLocationSettingsIntent(Context context) {
-    Intent intent = isAvailable(context) ? new Intent(
+    Intent intent = isEnforceable(context) ? new Intent(
         GoogleLocationUtils.ACTION_GOOGLE_LOCATION_SETTINGS)
         : new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
     intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     return intent;
   }
+
+  /**
+   * Returns true if location access is allowed.
+   * 
+   * @param context the context
+   */
+  public static boolean isLocationAccessAllowed(Context context) {
+    if (!isEnforceable(context)) {
+      return true;
+    }
+    return getUseLocationForServices(context) == USE_LOCATION_FOR_SERVICES_ON;
+  }
+
+  /**
+   * Get the current value for the 'Use value for location' setting.
+   * 
+   * @return One of {@link #USE_LOCATION_FOR_SERVICES_NOT_SET},
+   *         {@link #USE_LOCATION_FOR_SERVICES_OFF} or
+   *         {@link #USE_LOCATION_FOR_SERVICES_ON}.
+   */
+  private static int getUseLocationForServices(Context context) {
+    ContentResolver contentResolver = context.getContentResolver();
+    Cursor cursor = null;
+    String stringValue = null;
+    try {
+      cursor = contentResolver.query(GOOGLE_SETTINGS_CONTENT_URI, new String[] { VALUE },
+          NAME + "=?", new String[] { USE_LOCATION_FOR_SERVICES }, null);
+      if (cursor != null && cursor.moveToNext()) {
+        stringValue = cursor.getString(0);
+      }
+    } catch (RuntimeException e) {
+      Log.w(TAG, "Failed to get 'Use My Location' setting", e);
+    } finally {
+      if (cursor != null) {
+        cursor.close();
+      }
+    }
+    if (stringValue == null) {
+      return USE_LOCATION_FOR_SERVICES_NOT_SET;
+    }
+    int value;
+    try {
+      value = Integer.parseInt(stringValue);
+    } catch (NumberFormatException nfe) {
+      value = USE_LOCATION_FOR_SERVICES_NOT_SET;
+    }
+    return value;
+  }
 }