使用Handler.postDelayed运行多个Runnables
使用Handler.postDelayed运行多个Runnables
提问于 2012-10-30 02:24:41
我正在尝试让一段代码定期运行。
下面是我的代码：
int endTime = 52;
final double[] weights = new double[endTime];
for (int j = 0; j < endTime; j++) {
final int k = j;
newWeight = i.integrate(getCarbs(), getProt(), getFat(), newWeight,
height, age, PAL, gender, 7);
double percentChange = (newWeight - weight);
percentChange = percentChange * 100 / weight;
if(percentChange <-100){
percentChange = -100;
}
weights[j] = percentChange;
final DecimalFormat twoDForm = new DecimalFormat("0.00");
final Handler h = new Handler();
int time = 300*(j);
Runnable r = new Runnable() {
public void run() {
((TextView) findViewById(R.id.weightGainNumbers))
.setText("Week:\t" + (k + 1) + "\nWeight Change:\t"
+ twoDForm.format(weights[k]) + "%");
animate(weights[Math.abs(k - 1)], weights[k], false);
}
};
h.postDelayed(r, time);
}动画只需要100毫秒。然而，当我运行这段代码时，应用程序挂起了，并且只在j= 15左右才开始执行它应该做的事情。
回答 1
Stack Overflow用户
回答已采纳
发布于 2012-10-30 02:44:56
在循环的每次迭代中，您都在执行不必要的工作，比如当您可以简单地重用一个DecimalFormats时，创建新的each。此外，您只需要一个处理程序，并且每个视图都已经有一个处理程序。总而言之，这应该会运行得更顺利。
首先，设置了一些类变量：
final DecimalFormat twoDForm = new DecimalFormat("0.00");
TextView weightGainNumbers;
int weightGainIndex = 0;
final double[] weights;
Runnable r = new Runnable() {
public void run() {
weightGainNumbers.setText("Week:\t" + (weightGainIndex + 1) + "\nWeight Change:\t"
+ twoDForm.format(weights[weightGainIndex]) + "%");
if(weightGainIndex > 0)
animate(weights[Math.abs(weightGainIndex - 1)], weights[weightGainIndex], false);
// This animation is a guess, but you get the idea...
else
animate(0, weights[weightGainIndex], false);
weightGainIndex++;
// Call the next animation or reset the index for next time
if(weightGainIndex < weights.length)
weightGainNumbers.postDelayed(r, 300);
else
weightGainIndex = 0;
}
};接下来，在onCreate()中初始化weightGainNumbers TextView。
最后，使用以下代码：
int endTime = 52;
weights = new double[endTime];
for (int j = 0; j < endTime; j++) {
newWeight = i.integrate(getCarbs(), getProt(), getFat(), newWeight,
height, age, PAL, gender, 7);
weights[j] = Math.max(percentChange * 100 / (newWeight - weight), -100);
}
weightGainNumbers.post(r);如果你有任何具体的问题，请告诉我。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/13127483
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