Android - 如何将数据传递给 runOnUiThread 中的 Runnable? [英] Android - howto pass data to the Runnable in runOnUiThread?

问题描述

我需要更新一些 UI 并使用 runOnUiThread 在 UI 线程内部执行此操作
现在 UI 的数据来自另一个线程，这里用 data 表示.

I need to update some UI and do it inside of the UI thread by using runOnUiThread
Now the data for the UI comes from the other Thread, represented by data here.

如何将数据传递给 Runnable，以便它们可用于更新 UI?Android 似乎不允许直接使用数据.有没有一种优雅的方法来做到这一点?

How can i pass the data to the Runnable, so tht they can be used to update the UI? Android doesn't seem to allow using data directly. Is there an elegant way to do this?

public void OnNewSensorData(Data data) {

    runOnUiThread(new Runnable() {
        public void run() {
            //use data
        }
    });
}

我的解决方案是在 runnable 内部创建一个字段 private Data sensordata，并将数据分配给它.这仅适用于原始 Data data 是最终的.

My solution was creating a fioeld private Data sensordata inside of the runnable, and assigning data to it. This works only, if the original Data data is final.

public void OnNewSensorData(final Data data) {

    runOnUiThread(new Runnable() {
        private Data sensordata = data;
        public void run() {
            //use sensordata which is equal to data
        }
    });
}

推荐答案

你发现的问题是

Java 中的内部类捕获(关闭")其中的词法范围它们被定义.但它们只捕获声明为final"的变量.

Inner classes in Java capture ("close over") the lexical scope in which they are defined. But they only capture variables that are declared "final".

如果这很清楚，这里有一个很好的细节讨论:无法参考到以不同方法定义的内部类中的非最终变量

If this is clear as mud, there's a good discussion of the details here: Cannot refer to a non-final variable inside an inner class defined in a different method

但是您的解决方案看起来不错.此外，如果 data 是最终的，您可以将代码简化为:

But your solution looks fine. In addition, provided that data is final, you could simplify the code to this:

public void OnNewSensorData(final Data data) {
    runOnUiThread(new Runnable() {
        public void run() {
            // use data here
            data.doSomething();
        }
    });
}

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