GitskariosDownloadManager.java

package com.alorma.github.utils;

import android.Manifest;
import android.app.DownloadManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Environment;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.annotation.StringRes;
import android.support.v4.content.ContextCompat;
import android.widget.Toast;
import com.alorma.github.R;
import com.karumi.dexter.Dexter;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.single.PermissionListener;

public class GitskariosDownloadManager {

  public void download(final Context context, final String path, final String name, @Nullable MessageDispatcher view) {
    if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
      downloadFromAndroid(context, path, name);
    } else {
      PermissionListener permissionListener = new PermissionListener() {
        @Override
        public void onPermissionGranted(PermissionGrantedResponse response) {
          downloadFromAndroid(context, path, name);
        }

        @Override
        public void onPermissionDenied(PermissionDeniedResponse response) {
          if (response.isPermanentlyDenied() && view != null) {
            view.showMessage(R.string.external_storage_permission_request);
          }
        }

        @Override
        public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
          token.continuePermissionRequest();
        }
      };
      if (!Dexter.isRequestOngoing()) {
        Dexter.checkPermission(permissionListener, Manifest.permission.WRITE_EXTERNAL_STORAGE);
      }
    }
  }

  private void downloadFromAndroid(Context context, String path, String name) {
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(path));
    DownloadManager dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);

    request.setTitle(name);
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "gitskarios/" + name);
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    request.allowScanningByMediaScanner();
    dm.enqueue(request);

    Toast.makeText(context, name + " queued to download at gitskarios/", Toast.LENGTH_SHORT).show();
  }

  public void openAppSettings(Context context) {
    Intent myAppSettings = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.parse("package:" + context.getPackageName()));
    myAppSettings.addCategory(Intent.CATEGORY_DEFAULT);
    myAppSettings.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(myAppSettings);
  }

  public interface MessageDispatcher {
    void showMessage(@StringRes int text);
  }
}