HandlerThread not running in the background?… here is a solution to the problem.
HandlerThread not running in the background?
I’m trying to learn how to run in the background using HandlerThread. I have a button in the fragment that, after clicking it, I want to get the number of entries from the database. But when I actually ran it, logcat said the app might be doing too much work on the main thread, and I don’t know what I’m doing wrong.
Here’s how I arrange the code in fragment:
private Handler handler=new Handler();
private MyWorkerThread myWorkerThread;
private Runnable myRunnable=new Runnable() {
@Override
public void run() {
handler.post(new Runnable() {
@Override
public void run() {
List<Item> list=db.getAllItems();
Log.d(TAG,"Size: "+list.size());
}
});
}
};
private class MyWorkerThread extends HandlerThread{
private Handler myHandler;
private MyWorkerThread(String name) {
super(name);
}
private void postTask(Runnable task){
myHandler.post(task);
}
private void setMyHandler(){
myHandler=new Handler(getLooper());
}
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myWorkerThread=new MyWorkerThread("myWorkerThread");
myWorkerThread.start();
myWorkerThread.setMyHandler();
}
@OnClick(R.id.btn)
void getCount(){
myWorkerThread.postTask(myRunnable);
}
I’m following the example in this blog post, but I’m not sure I’m doing anything wrong , which still blocks the UI at runtime.
Solution
Remove it from your Runnable
:
handler.post(new Runnable() {
You’re publishing your Runnable, which in turn just posts the Runnable
back to the
main thread. So your main thread is still doing all the work.