JetPack组成：忽略后代＆＃x27;内容描述

Question

假设我有一个带有行的列。每一行都是逻辑单元，我想对话以逐行导航，而无需选择该行的后代。 现在，使用MERGEDESCENDANTS = true现在可以很容易地实现这一点

，我有一个针对该行的量身定制的内容描述，可以提供更自然的描述。我如何忽略后代的文本要阅读，以防止将信息加倍？

tl; dr：使用合并Escendants;如何使对讲替换而不是合并后代的内容描述？

@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

我假设在您上方呈现的代码中，box表示您的“行”。首先尝试合并Box的孩子的语义属性，然后通过将以下修饰符应用于Box来清除所有内容并设置自定义内容说明：

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

此外，您还可以在每个Box的孩子上明确调用以下以下内容，以确保其语义属性忽略：

Modifier.clearAndSetSemantics {}