How to Implement a Download Progress Bar in your Android Application

How to Implement a Download Progress Bar in your Android Application

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This tutorial describes how to implement a download progress bar in android, through the following steps:

1) we create a new project in an android studio with new project wizard and choose empty activity form the wizard in our project.
2) we then go to activity_main.xml file and add Button view with id “button” and text “Download Image”.
3) then we go to MainActivity.java class and get button and add click listener to it.
5) then we create class called DownloadImage which extends AsyncTask class.
6) we implement the download of image and updating the progress bar.
7) we go to the manifest to add network permission and write external storage permission.
7) Finally we deploy and run the app to the android emulator.

Notes:

1) URL: is a class that represents a Uniform Resource Locator, a pointer to a “resource” on the World Wide Web. A resource can be something as simple as a file or a directory, or it can be a reference to a more complicated object, such as a query to a database or to a search engine.

2) URLConnection: is the superclass of all classes that represent a communications link between the application and a URL. Instances of this class can be used both to read from and to write to the resource referenced by the URL.

3) ProgressDialog: A dialog showing a progress indicator and an optional text message or view. Only a text message or a view can be used at the same time. The dialog can be made cancelable on back key press and the progress range is 0 to max value.

The source code is available at http://www.indragni.com/android/DownloadProgressBar.rar

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How to Implement a Download Progress Bar in your Android Application

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The first step is to google an NDA – non-disclosure agreement. Get the people you are going to work with to sign the NDA. That way it makes them less likely to lie you. Most likely you will not act on the NDA, but it is useful to have it.

We are going to use Upwork to find a developer. This is not as easy as it sounds. There is a lot stuff that can go wrong here than most people imagine. I have hired hundreds of people on Upwork over the last decade and I failed most of the time.

I am going to post a job, so I have to login with my client, hiring account. I am looking to hire a developer for a short term project. After that you should go to the category “Web, Mobile & Software Dev” and then “Mobile Development”.

Then, you should write the name of your job. We need an app similar to Instagram. Everyone uses Instagram, so if you relate to that, everyone will know what you are talking about. Our title can be something like “Picture social network like Instagram”.

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Then, you need to add the wireframe in the description and add briefly what qualifications and experience the applicant should have. Always, ask for examples of their previous work. Also, ask them how long it will take and how it will cost.

You need to add all the features that the app needs to have. You do not need to write all the screens in the app, because they are explained in the mindmap.

How much should you pay for an app? All of the applicants will give you different prices. The real price of your app will be the average of those prices. If you hire developers, hire people from Eastern Europe like Russia, Ukraine, Poland. Those are the best countries for the value that you will get for the money. Eastern European countries deliver better work for less money.

Look how much money they have made on Upwork. The more money that have made on Upwork, the better, because they already have experience. Look at their reviews, portfolio, profile. Read it carefully and find out what kind of person you are talking to. Create a shortlist of your best candidates and then setup calls with them.

If you want to create an iPhone, make sure they have an iPhone. If they do not have an iPhone, they will not be a good match for your job.

It is better to work on a fixed price budget and a mobile app like that can cost about $3500.

Look for people with 90% job success or more and more than 500 hours billed on Upwork. That is a proof that your freelancer has experience. Do not include rising talent as an option.

After that you get your shortlist of candidates in Skype and you interview them. You can ask them all kinds of questions regarding the project. Make it hard for them to apply.

Questions you can ask during the interview:
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Do not work with resellers. If he is not a reseller, you should demand to speak with a developer. Ask very technical questions. If you are not technical, get a technical friend to ask the questions for you.

Do not pay 100% upfront. Pay 25% or less upfront, preferably 0%.

Channel: Aleksander Vitkin
Published: 2016-10-29 11:54:21
Duration: 25M15S
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