我正在尝试创建一个滞后计时器，我正在使用 System.nanotime 来执行此操作。我的问题是，我用来保存时间的数组的最小数量始终等于零。我遇到的另一个问题是我打印出 Time 和 GrayValGlobal 的值，它们没有紧随其后出现，我觉得这与我的第一个问题有关。
代码
public class startTestAsync extends AsyncTask<Double, Void, Void> {
long [] timeArray = new long[500]; // set array
long rating;
long lagStartTime;
long lagEndTime;
long lagTimeResult;
int testAmount;
int cnt;
@Override
protected Void doInBackground(Double... grayVal) {
for (testAmount = 0; testAmount < 500; testAmount++) {
lagStartTime = System.nanoTime(); //start lagTimer start
runOnUiThread(new Runnable() {
public void run() {
lagSquare.setBackgroundColor(Color.rgb(255, 255, 255));
}
});
while (grayValGlobal >= 100.0) {
Log.i("Mat Value Async", String.valueOf(grayValGlobal));
runOnUiThread(new Runnable() {
public void run() {
lagSquare.setBackgroundColor(Color.rgb(000, 000, 000));//set lagSquare black
}
});
lagEndTime = System.nanoTime();
lagTimeResult = (lagEndTime - lagStartTime) / 1000000;
timeArray[testAmount] = lagTimeResult;
Log.i("Time", String.valueOf(timeArray[testAmount]));
}
}
//min scan
long minTimeArray = timeArray[0];
for (cnt = 0; cnt < timeArray.length; cnt++) {
if (timeArray[cnt] < minTimeArray) {
minTimeArray = timeArray[cnt];
}
}
Log.i("MinTimeArray", String.valueOf(minTimeArray));
final String minTimeArrayString = String.valueOf(minTimeArray);
rating = minTimeArray;
runOnUiThread(new Runnable() {
@Override
public void run() {
lagTime.setText(minTimeArrayString);
if (rating <= 17.0) {
lagRating.setText("Excellent");
}
else if (rating <= 34.0){
lagRating.setText("Great");
}
else if (rating <= 51.0){
lagRating.setText("Average");
}
else {
lagRating.setText("Bad");
}
}
});
return null;
}
}
日志猫
08-29 17:10:27.849 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4102.355956
08-29 17:10:27.850 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4102.569579
08-29 17:10:27.850 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4102.966307
08-29 17:10:27.850 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.851 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4103.332518
08-29 17:10:27.851 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.851 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4103.668212
08-29 17:10:27.851 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4103.912352
08-29 17:10:27.851 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.851 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4104.339598
08-29 17:10:27.852 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4104.980467
08-29 17:10:27.852 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4105.163573
08-29 17:10:27.853 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4105.438232
08-29 17:10:27.853 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4105.651855
08-29 17:10:27.853 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.853 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.853 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.854 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4106.445312
08-29 17:10:27.854 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4106.689453
08-29 17:10:27.854 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4106.903076
08-29 17:10:27.854 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4107.116699
08-29 17:10:27.854 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4107.330322
08-29 17:10:27.855 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4107.543945
08-29 17:10:27.855 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.855 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4107.910156
08-29 17:10:27.855 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.856 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.856 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.856 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.856 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.857 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4109.49707
08-29 17:10:27.857 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.857 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.857 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4110.290527
08-29 17:10:27.858 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4110.50415
08-29 17:10:27.858 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4110.74829
08-29 17:10:27.858 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4110.961913
08-29 17:10:27.858 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4111.206054
08-29 17:10:27.859 9897-11295/bluemage.systems.displaylatencytester I/Mat Value Async﹕ 131.0
08-29 17:10:27.859 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4111.877441
08-29 17:10:27.859 9897-10042/bluemage.systems.displaylatencytester I/Mat Value﹕ 95.0
08-29 17:10:27.859 9897-11295/bluemage.systems.displaylatencytester I/Time﹕ 4112.213134
08-29 17:10:27.862 9897-11295/bluemage.systems.displaylatencytester I/MinTimeArray﹕ 0.0
最佳答案
您只执行了五个滞后测试，但您的 timearray 有 500 个元素。一旦最小扫描仪达到迭代 6，您将获得最小值 0，此后它将永远不会改变。
关于java - 数组的最小值始终等于零，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32290946/