DownloadMangerResolver.java

package party.danyang.nationalgeographic.utils;

import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.support.v7.app.AlertDialog;

import party.danyang.nationalgeographic.R;

/**
 * Created by dream on 16-10-11.
 */
public final class DownloadMangerResolver {

    private static final String DOWNLOAD_MANAGER_PACKAGE_NAME = "com.android.providers.downloads";

    /**
     * Resolve whether the DownloadManager is enable in current devices.
     *
     * @return true if DownloadManager is enable,false otherwise.
     */
    public static boolean resolve(Context context) {
        boolean enable = resolveEnable(context);
        if (!enable) {
            showDialog(context);
        }
        return enable;
    }

    /**
     * Resolve whether the DownloadManager is enable in current devices.
     *
     * @param context
     * @return true if DownloadManager is enable,false otherwise.
     */
    private static boolean resolveEnable(Context context) {
        int state = context.getPackageManager()
                .getApplicationEnabledSetting(DOWNLOAD_MANAGER_PACKAGE_NAME);

        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2) {
            return !(state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED ||
                    state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER
                    || state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED);
        } else {
            return !(state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED ||
                    state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER);
        }
    }

    private static void showDialog(final Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setMessage(R.string.enable_download_manager);
        builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
                enableDownloadManager(context);
            }
        });
        builder.setNegativeButton(R.string.cancel, null);
        builder.show();
    }

    /**
     * Start activity to Settings to enable DownloadManager.
     */
    private static void enableDownloadManager(Context context) {
        try {
            //Open the specific App Info page:
            Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
            intent.setData(Uri.parse("package:" + DOWNLOAD_MANAGER_PACKAGE_NAME));
            context.startActivity(intent);
        } catch (ActivityNotFoundException e) {
            e.printStackTrace();

            //Open the generic Apps page:
            Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
            context.startActivity(intent);
        }
    }
}