Jetpack Compose：忽略后代的内容描述

Question

假设我有一个带有行的列。 每行都是一个逻辑单元，我希望 Talkback 逐行浏览列，而不选择行的后代。 使用mergeDescendants = true很容易实现

现在，我为 Row 定制了一个 contentDescription，它提供了更自然的描述。 如何忽略要阅读的后代文本，以防止信息翻倍？

tl;dr：当使用mergeDescendants时； 如何让 Talkback 替换而不是合并后代的 contentDescriptions？

@Composable
fun Greeting() {
    // Goal: Each row is a single entity for talkback, that has a content desccription describing the entire tow
    // descendants should not be focused when navigating by swipe w/ talkback
    // "Greeting for Android X" should be read, descendants should not be read automatically.
    Column(modifier = Modifier.padding(20.dp)) {// Screen padding
        Box(
            // "greeting for Android 1 ... Hello Android! ... How do you do?" :-(
            // descendants can not be selected individually :-)
            Modifier.semantics(mergeDescendants = true) {
                contentDescription = "greeting for Android 1"
            }
        ) {
            Row {
                Text(text = "Hello Android!", modifier = Modifier.padding(32.dp))
                Text(text = "How do you do?", modifier = Modifier.padding(32.dp))
            }
        }
        Box(
            // "greeting for Android 2" :-)
            // descendants will be traversed next :-(
            Modifier.semantics {
                contentDescription = "greeting for Android 2"
            }
        ) {
            Row {
                Text(text = "Hello Android!", modifier = Modifier.padding(32.dp))
                Text(text = "How do you do?", modifier = Modifier.padding(32.dp))
            }
        }
        Box(
            // "greeting for Android 3" :-)
            // descendants can not be selected individually :-)

            // When using tap to speak rather than swipe, it is hard to select the row:
            // Only when tapping empty space will the row be selected.
            // When tapping either text element,nothing happens. :-(
            // Expected: the row is selected and "greeting for android 3" is read when 
            // I tap anywhere inside it's bounds
            Modifier.semantics {
                contentDescription = "greeting for Android 3"
            }
        ) {
            Row(Modifier.clearAndSetSemantics {}) {
                Text(text = "Hello Android!", modifier = Modifier.padding(32.dp))
                Text(text = "How do you do?", modifier = Modifier.padding(32.dp))
            }
        }
    }
}

Answer 1

我假设在您在顶级Box上方提供的代码中代表您的“行”。 尝试首先合并 Box 子项的语义属性，然后通过对 Box 应用以下修饰符来清除所有这些属性并设置您的自定义内容描述：

Modifier
  .semantics(mergeDescendants = true) {}
  .clearAndSetSemantics { contentDescription = "greeting for Android 1" }

此外，您还可以在每个 Box 的子项上显式调用以下内容，以确保忽略它们的语义属性：

Modifier.clearAndSetSemantics {}