Patterns for running Asynchronous code in Android (Part 1)

An important technique in Android Programming is to make potentially long task run asynchronously in your app, avoid blocking the UI thread, so your app feels more responsive. For example, downloading a file from the Internet, loading a media file from the external storage or applying a filter on an image bitmap etc. I will show you how to implement with AsyncTask, simple java threads and java Executor in Part 1.

Let’s say I want to load a bitmap from the internet, and set it to an ImageView , this might be what you’d write at first:

The Java way: simple Threads

You can implement it just like any other Java programs, define a Thread that does the job, and run it. Every Java programmer knows how to do that. Remember that if you want to modify the UI, you need to use runOnUiThread()

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