AppNag

import android.app.Dialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class AppNag {
     public final static String APP_TITLE = "Pencil Touch";
        public final static String APP_PNAME = "com.sprucewerk.penciltouch";

        private final static int DAYS_UNTIL_PROMPT = 1;
        private final static int LAUNCHES_UNTIL_PROMPT = 3;

        public static void app_launched(Context mContext) {
            SharedPreferences prefs = mContext.getSharedPreferences("appnag", 0);

            SharedPreferences.Editor editor = prefs.edit();

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

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

            // Wait at least n days before opening
            if (launch_count >= LAUNCHES_UNTIL_PROMPT) {
                if (System.currentTimeMillis() >= date_firstLaunch +
                        (DAYS_UNTIL_PROMPT * 24 * 60 * 60 * 1000)) {
                    showRateDialog(mContext, editor);
                }
            }

            editor.commit();
        }

        public static void showRateDialog(final Context mContext, final SharedPreferences.Editor editor) {
            final Dialog dialog = new Dialog(mContext);
            dialog.setTitle("Get " + APP_TITLE +" Pro. Now!");

            LinearLayout ll = new LinearLayout(mContext);
            ll.setOrientation(LinearLayout.VERTICAL);

            TextView tv = new TextView(mContext);
            tv.setText("If you enjoy using " + APP_TITLE +
                    ", get the Pro version. Get more effects, more fun, more support, more updates...!");
            tv.setWidth(240);
            tv.setPadding(4, 0, 4, 10);
            ll.addView(tv);

            Button b1 = new Button(mContext);
            b1.setText("Get " + APP_TITLE+" Pro");
            b1.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    mContext.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + APP_PNAME)));
                    dialog.dismiss();
                }
            });
            ll.addView(b1);

            Button b2 = new Button(mContext);
            b2.setText("Next Time");
            b2.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });
            ll.addView(b2);

            dialog.setContentView(ll);
            dialog.show();
        }
}