AbstractGooglePlayServicesChecker.java

package com.google.android.stardroid.activities.util;

import android.Manifest;
import android.app.Activity;
import android.app.FragmentManager;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.widget.Toast;

import com.google.android.stardroid.R;
import com.google.android.stardroid.activities.DynamicStarMapActivity;
import com.google.android.stardroid.activities.dialogs.LocationPermissionRationaleFragment;
import com.google.android.stardroid.control.LocationController;
import com.google.android.stardroid.util.MiscUtil;

/**
 * Created by johntaylor on 4/2/16.
 */
public abstract class AbstractGooglePlayServicesChecker implements LocationPermissionRationaleFragment.Callback {
  protected static final String TAG = MiscUtil.getTag(GooglePlayServicesChecker.class);
  protected final Activity parent;
  protected final SharedPreferences preferences;
  private final LocationPermissionRationaleFragment rationaleDialog;
  private final FragmentManager fragmentManager;

  AbstractGooglePlayServicesChecker(Activity parent, SharedPreferences preferences,
                            LocationPermissionRationaleFragment rationaleDialog,
                            FragmentManager fragmentManager) {
    this.parent = parent;
    this.preferences = preferences;
    this.rationaleDialog = rationaleDialog;
    this.fragmentManager = fragmentManager;
    rationaleDialog.setCallback(this);
  }

  /**
   * Checks whether play services is available and up to date and prompts the user
   * if necessary.
   * <p/>
   * Note that at present we only need it for location services so if the user is setting
   * their location manually we don't do the check.
   */
  public abstract void maybeCheckForGooglePlayServices();

  protected void checkLocationServicesEnabled() {
    if (ActivityCompat.checkSelfPermission(parent, Manifest.permission.ACCESS_FINE_LOCATION)
        != PackageManager.PERMISSION_GRANTED) {
      Log.d(TAG, "Location permission not enabled - maybe prompting user");
      // Check Permissions now
      if (ActivityCompat.shouldShowRequestPermissionRationale(
          parent, Manifest.permission.ACCESS_FINE_LOCATION)) {
        rationaleDialog.show(fragmentManager, "Rationale Dialog");
      } else {
        requestLocationPermission();
      }
    } else {
      Log.d(TAG, "Location permission is granted");
    }
  }

  private void requestLocationPermission() {
    ActivityCompat.requestPermissions(parent,
        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
        DynamicStarMapActivity.GOOGLE_PLAY_SERVICES_REQUEST_LOCATION_PERMISSION_CODE);
  }

  /**
   * Called after a request to check permissions.
   */
  public void runAfterPermissionsCheck(int requestCode,
                                       String[] permissions,
                                       int[] grantResults) {
    if (grantResults.length == 1
        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
      Log.i(TAG, "User granted permission");
    } else {
      Log.i(TAG, "User denied permission");
      // TODO(jontayler): Send them to the location dialog;
    }
  }

  /**
   * Called after the user is prompted to resolve any issues.
   */
  public void runAfterDialog() {
    // Just log for now.
    Log.d(TAG, "Play Services Dialog has been shown");
  }

  public void done() {
    Log.d(TAG, "Location rationale Dialog has been shown");
    requestLocationPermission();
  }
}