"Android" Threads and asynchronous operations

The Android SDK provides a way to isolate certain operations from the main UI thread:

• The Asynctask class, which completes the asynchronous operation and maintains communication with the main UI thread
• Standard thread class completes asynchronous operation
• Use loader to perform data loading in activity or fragment to ensure speed of operation

The action of blocking the thread will result in a ANR behavior (application not responding)

Common blocking threads include the following:

• All too long or responsible calculations or operations
• Request for variable-length data sets
• Parsing a data set
• Working with multimedia files, example, video, or audio
• Iterate over variable-length data structures
• Get network resources
• Get Location Services
• Get the content Provider interface
• Access Local Database
• Access Local Files
• Access tasks include services with the above content

Asynctask callback method:

OnPreExecute () runs on the UI thread before the background operation is complete;

Doinbackground () runs in the background and handles background operations;

Calling the Publishprocess () method from Doinbackground () periodically notifies the UI thread about the progress of the background operation. This method sends a message to the UI action and takes this opportunity to update the user-visible progress bar. Onprocessupdate () runs in the UI thread;

The background operation is complete, OnPostExecute () runs on the UI thread;

Run execute (), Asynctask handles the operation in the background without affecting the UI thread;

Asynctask Task Start Method:

• Execute () method, where each task instance is executed once, like using a thread pool;
• Executeonexector (asynctask.thread_pool_executor,id); Perform tasks by ID

"Android" Threads and asynchronous operations