android - AsyncTask execute() or executeOnExecutor()? -


what's difference between using execute() , executeonexecuter()?

  • how execute() execute tasks default? (in serial or in parallel?)

  • what should used new sdks >16?

  • is practice use parallel execution (thread_pool_executor) tasks rather serial if doesn't matter application or depends on number of asynctasks executed?

how .execute execute tasks default (in serial or in parallel).

before api level 11: parallel.

api level 11 , up: serial.

which should used new sdks >16 (executeonexecuter ?)

depends on requirements. use execute() if you're happy default executor. use explicit executor if you're not.

is practice use parallel execution (thread_pool_executor) tasks rather serial if doesn't matter application or depends on number of async tasks executed?

async tasks should used relative short backround operations. quoting asynctask documentation:

asynctasks should ideally used short operations (a few seconds @ most.) if need keep threads running long periods of time, highly recommended use various apis provided java.util.concurrent package such executor, threadpoolexecutor , futuretask.

while async task running, executor thread cannot execute other tasks. on serial executor 1 executor thread easier detect problems when tasks run long. on parallel executor detecting such problems takes more simultaneous long-running tasks.

therefore, if need switch parallel executor, you're better off revisiting design.


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