AppRater.java

package com.nf2m.rater;

import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

import com.nf2m.R;


public class AppRater {
    private final static String APP_PNAME = "com.nf2m";

    private final static int DAYS_UNTIL_PROMPT = 3;
    private final static int LAUNCHES_UNTIL_PROMPT = 7;
    private static final String KEY_DONT_SHOW_AGAIN = "dontshowagain";
    private static final String KEY_LAUNCH_COUNT = "launch_count";
    private static final String KEY_DATE_FIRST_LAUNCH = "date_firstlaunch";
    private static final String KEY_FIRST_SHOW = "key_first_show";

    public static void app_launched(@NonNull Context mContext) {
        SharedPreferences prefs = mContext.getSharedPreferences("apprater", 0);
        if (prefs.getBoolean(KEY_DONT_SHOW_AGAIN, false)) {
            return;
        }

        SharedPreferences.Editor editor = prefs.edit();

        // Increment launch counter
        long launch_count = prefs.getLong(KEY_LAUNCH_COUNT, 0) + 1;
        editor.putLong(KEY_LAUNCH_COUNT, launch_count);

        // Get date of first launch
        Long date_firstLaunch = prefs.getLong(KEY_DATE_FIRST_LAUNCH, 0);
        if (date_firstLaunch == 0) {
            date_firstLaunch = System.currentTimeMillis();
            editor.putLong(KEY_DATE_FIRST_LAUNCH, date_firstLaunch);
        }

        // Wait at least n days before opening
        if (launch_count >= LAUNCHES_UNTIL_PROMPT) {
            boolean isFirstShow = prefs.getBoolean(KEY_FIRST_SHOW, true);
            if (isFirstShow) {
                editor.putBoolean(KEY_FIRST_SHOW, false);
                showRateDialog(mContext, editor);
            } else if (System.currentTimeMillis() >= date_firstLaunch +
                    (DAYS_UNTIL_PROMPT * 24 * 60 * 60 * 1000)) {
                showRateDialog(mContext, editor);
            }
        }

        editor.apply();
    }

    private static void showRateDialog(@NonNull final Context mContext, @Nullable final SharedPreferences.Editor editor) {

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
        alertDialog.setTitle(mContext.getString(R.string.rate_dialog_title));
        alertDialog.setMessage(mContext.getString(R.string.rate_tar_message));
        alertDialog.setPositiveButton(mContext.getString(R.string.rate_tar_rate_button), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                try {
                    mContext.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + APP_PNAME)));
                } catch (ActivityNotFoundException e) {
                    mContext.startActivity(new Intent(Intent.ACTION_VIEW,
                            Uri.parse("http://play.google.com/store/apps/details?id=" + APP_PNAME + mContext.getPackageName())));
                }
                if (editor != null) {
                    editor.putBoolean(KEY_DONT_SHOW_AGAIN, true);
                    editor.commit();
                }
            }
        });

        alertDialog.setNegativeButton(mContext.getString(R.string.rate_tar_remind_button), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (editor != null) {
                    editor.putLong(KEY_DATE_FIRST_LAUNCH, 0);
                    editor.commit();
                }
            }
        });

        alertDialog.setNeutralButton(mContext.getString(R.string.rate_tar_no_button), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (editor != null) {
                    editor.putBoolean(KEY_DONT_SHOW_AGAIN, true);
                    editor.commit();
                }
            }
        });

        alertDialog.create().show();

    }
}