@@ -0,0 +1,85 @@
skipFrameCount监听
import android.util.Log;
import android.view.Choreographer;
import com.ta.utdid2.android.utils.SystemProperties;
import java.lang.reflect.Field;
public class SMFrameCallback implements Choreographer.FrameCallback {
public static SMFrameCallback sInstance;
private String TAG="SMFrameCallback";
public static final float deviceRefreshRateMs=16.6f;
public static long lastFrameTimeNanos=0;//纳秒为单位
public static long currentFrameTimeNanos=0;
public void start() {
Choreographer.getInstance().postFrameCallback(SMFrameCallback.getInstance());
}
public static SMFrameCallback getInstance() {
if (sInstance == null) {
sInstance = new SMFrameCallback();
}
return sInstance;
}
@Override
public void doFrame(long frameTimeNanos) {
if(lastFrameTimeNanos==0){
lastFrameTimeNanos=frameTimeNanos;
Choreographer.getInstance().postFrameCallback(this);
return;
}
currentFrameTimeNanos=frameTimeNanos;
float value=(currentFrameTimeNanos-lastFrameTimeNanos)/1000000.0f;
final int skipFrameCount = skipFrameCount(lastFrameTimeNanos, currentFrameTimeNanos, deviceRefreshRateMs);
if(skipFrameCount > 30){
Log.e(TAG,"两次绘制时间间隔value="+value+" frameTimeNanos="+frameTimeNanos+" currentFrameTimeNanos="+currentFrameTimeNanos+" skipFrameCount="+skipFrameCount+"");
}
lastFrameTimeNanos=currentFrameTimeNanos;
Choreographer.getInstance().postFrameCallback(this);
}
private int getLimitCount(){
try {
Field field = Choreographer.class.getDeclaredField("SKIPPED_FRAME_WARNING_LIMIT");
return field.getInt(Choreographer.getInstance());
} catch (Throwable e) {
e.printStackTrace();
}
return 0;
}
/**
*
*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;
}
}
