TrialHelper.java

package com.debuggle.kale;

import java.util.Date;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;

import com.debuggle.kalefree.R;

public class TrialHelper {

	private static int getDemoDaysLeftOrStartDemo(Context ctx) {
		// Default value if anything fails.
		int daysleft = 21;
		
		// Get the first install date/time.
		try {
			long installed = ctx.getPackageManager().getPackageInfo("com.debuggle.kalefree", 0).firstInstallTime;
			
			// Get the days left.
			Date start = new Date(installed);
			Date end = new Date();
			
			// Get the difference.
			long difference = end.getTime() - start.getTime();
			
			// Determine how many days there are by dividing the difference by the total milliseconds in a day.
			daysleft = 21 - (int)( difference / (long)86400000 );
		} catch ( Exception error ) { }
		
		// Return the value.
		return daysleft;
	}
	
	public static int GetDemoDaysLeft(Context ctx) {
		return getDemoDaysLeftOrStartDemo(ctx);
	}
	
	public static void ShowDemoWarning(Context ctx, final Runnable onsuccess, final Runnable onfail) {
		final Context context = ctx;
		final int demoDays = getDemoDaysLeftOrStartDemo(ctx);
		
		// Check for silly cases.
		if ( demoDays > 22 ) { 
			AlertDialog.Builder builder = new AlertDialog.Builder(context);
			builder
				.setTitle(context.getText(R.string.msg_trial_title))
				.setMessage(context.getText(R.string.msg_trial_failure))
				.setCancelable(false)
				.setNegativeButton(context.getText(R.string.action_cancel), new OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						if ( onfail != null ) onfail.run();
					}
				});
			
			builder.create().show();
		} else if ( demoDays < 20 ) {
		
			AlertDialog.Builder builder = new AlertDialog.Builder(context);
			builder
				.setTitle(context.getText(R.string.msg_trial_title))
				.setMessage(context.getText(R.string.msg_trial_msg).toString().replace("{0}", "" + Math.max(demoDays, 0)))
				.setPositiveButton(context.getText(R.string.txtUpgrade), new OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						Intent intent = new Intent(Intent.ACTION_VIEW);
						intent.setData(Uri.parse("market://details?id=com.debuggle.kale"));
						context.startActivity(intent);
						
						// This fixes a bug where backspacing from the play store makes the 
						// app look broken.
						if ( onfail != null ) {
							onfail.run();
						}
					}
				})
				.setNegativeButton(context.getText(R.string.action_cancel), new OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						if ( demoDays >= 0 && onsuccess != null) {
							onsuccess.run();
						} else if ( demoDays < 0 && onfail != null) {
							onfail.run();
						}
					}
				})
				.setCancelable(false);
			
			builder.create().show();
		} else {
			// Don't bug the user for a few days.
			if ( onsuccess != null ) {
				onsuccess.run();
			}
		}
	}
	
}