Created
July 28, 2017 03:25
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帧分析工具类，一个打印帧率和丢帧情况log的工具类，原理是利用Choreographer的FrameCallback。
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| package com.wyon.util; | |
| import android.os.Build; | |
| import android.support.annotation.RequiresApi; | |
| import android.util.Log; | |
| import android.view.Choreographer; | |
| /** | |
| * 功能：分析丢帧情况和帧绘制耗时 | |
| * 描述：需要分析的代码前后加上 FrameAnalyze.start(), FrameAnalyze.stop() | |
| * Created by wyon on 6/17/17. | |
| */ | |
| public class FrameAnalyze { | |
| public static boolean start() { | |
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { | |
| SMFrameCallback.getInstance().mIsOpen = true; | |
| SMFrameCallback.getInstance().lastFrameTimeNanos = 0; | |
| SMFrameCallback.getInstance().postCallback(); | |
| return true; | |
| } | |
| return false; | |
| } | |
| public static void stop() { | |
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { | |
| SMFrameCallback.getInstance().stopInternal(); | |
| } | |
| } | |
| @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN) | |
| private static class SMFrameCallback implements Choreographer.FrameCallback { | |
| private static final String TAG = "SMFrameCallback"; | |
| private static final float deviceRefreshRateMs = 16.6f; | |
| private static SMFrameCallback sInstance; | |
| private long lastFrameTimeNanos = 0;//纳秒为单位 | |
| private boolean mIsOpen; | |
| private static SMFrameCallback getInstance() { | |
| if (sInstance == null) { | |
| sInstance = new SMFrameCallback(); | |
| } | |
| return sInstance; | |
| } | |
| private void postCallback() { | |
| if (mIsOpen) { | |
| Choreographer.getInstance().postFrameCallback(this); | |
| } | |
| } | |
| private void stopInternal() { | |
| mIsOpen = false; | |
| } | |
| @Override | |
| public void doFrame(long frameTimeNanos) { | |
| if (lastFrameTimeNanos == 0) { | |
| lastFrameTimeNanos = frameTimeNanos; | |
| postCallback(); | |
| return; | |
| } | |
| float value = (frameTimeNanos - lastFrameTimeNanos) / 1000000.0f; | |
| final int skipFrameCount = skipFrameCount(lastFrameTimeNanos, frameTimeNanos, deviceRefreshRateMs); | |
| Log.e(TAG, "两次绘制时间间隔value=" + value + " skipFrameCount=" + skipFrameCount + " frameTimeNanos=" + frameTimeNanos + " currentFrameTimeNanos=" + frameTimeNanos + ""); | |
| lastFrameTimeNanos = frameTimeNanos; | |
| postCallback(); | |
| } | |
| /** | |
| * 计算跳过多少帧 | |
| * | |
| * @param start | |
| * @param end | |
| * @param devicefreshRate | |
| * @return | |
| */ | |
| private int skipFrameCount(long start, long end, float devicefreshRate) { | |
| int count = 0; | |
| long diffNs = end - start; | |
| long diffMs = Math.round(diffNs / 1000000.0f); | |
| long dev = Math.round(devicefreshRate); | |
| if (diffMs > dev) { | |
| long skipCount = diffMs / dev; | |
| count = (int) skipCount; | |
| } | |
| return count; | |
| } | |
| } | |
| } |
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