UIJobScheduler

Android

Reference
看到有老外提出来的，作用是记录当前一帧进行的操作所花费的时间，如果不够进行下一个操作，则将下一个操作放到下一帧，以此来增加画面的流畅度。
源代码是kotlin编写的，尝试改成了java

import android.os.Handler;
import android.view.Choreographer;
import java.util.ArrayDeque;
import java.util.concurrent.Callable;
public class UIJobScheduler {
    private final static float MAX_JOB_TIMES_MS = 4f;
    private static long elapsed = 0L;
    private static ArrayDeque<Callable> jobQueue = new ArrayDeque<>();
    private static Handler handler = new Handler();
    private static boolean isOverMaxtime() {
        return elapsed > MAX_JOB_TIMES_MS * 1_000_000;
    }
    public static void submitJob(final Callable job) {
        jobQueue.add(job);
        if (jobQueue.size() == 1) {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    processJobs();
                }
            });
        }
    }
    private static void processJobs() {
        while (!jobQueue.isEmpty() && !isOverMaxtime()) {
            long start = System.nanoTime();
            Callable currentJob = jobQueue.poll();
            if (currentJob != null) {
                try {
                    currentJob.call();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            elapsed += System.nanoTime() - start;
        }
        if (jobQueue.isEmpty()) {
            elapsed = 0;
        } else {
            onNextFrame(new Choreographer.FrameCallback() {
                @Override
                public void doFrame(long frameTimeNanos) {
                    elapsed = 0;
                    processJobs();
                }
            });
        }
    }
    private static void onNextFrame(Choreographer.FrameCallback callback) {
        Choreographer.getInstance().postFrameCallback(callback);
    }
}