Android Talkback 在 TextInputLayout 上的错误公告

Question

我的布局中有以下代码

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<com.google.android.material.textfield.TextInputLayout\n        android:id="@+id/tilPassword"\n        style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"\n        android:layout_width="match_parent"\n        android:layout_height="wrap_content"\n        android:hint="Password"\n        app:layout_constraintEnd_toEndOf="parent"\n        app:layout_constraintStart_toStartOf="parent"\n        app:layout_constraintTop_toBottomOf="@id/tilUserName"\n        app:passwordToggleEnabled="true">\n\n        <com.google.android.material.textfield.TextInputEditText\n            android:id="@+id/tiePassword"\n            android:layout_width="match_parent"\n            android:layout_height="wrap_content"\n            android:imeOptions="actionDone"\n            android:inputType="textPassword"\n            android:selectAllOnFocus="true"\n            android:singleLine="true" />\n\n    </com.google.android.material.textfield.TextInputLayout>\n

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导航到 TextInputLayout 时 TalkBack 宣布：“密码密码编辑框”

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所需的公告：“密码编辑框”

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如果我删除其中一个，android:hint="Password"或者 android:inputType="textPassword"它会按预期工作。

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设置提示的注意事项

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提示应设置在 TextInputLayout 上，而不是 TextInputEditText 或 EditText 上。如果在 XML 中的子 EditText 上指定了提示，则 TextInputLayout 可能仍能正常工作；TextInputLayout 将使用 EditText\xe2\x80\x99s 提示作为其浮动标签。但是，以后调用修改提示将不会更新 TextInputLayout\xe2\x80\x99s 提示。为了避免意外行为，请在 TextInputLayout 上调用 setHint() 和 getHint()，而不是在 EditText 上调用。

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Answer 1

通过检查源代码：

文本输入布局类

https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/textfield/TextInputLayout.java

人们可以发现：

TextInputLayout 辅助功能信息通过以下公共类提供：

public static class AccessibilityDelegate extends AccessibilityDelegateCompat {
    private final TextInputLayout layout;

    public AccessibilityDelegate(TextInputLayout layout) {
        this.layout = layout;
    }

    @Override
    public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
        super.onInitializeAccessibilityNodeInfo(host, info);
        EditText editText = layout.getEditText();
        CharSequence text = (editText != null) ? editText.getText() : null;
        CharSequence hintText = layout.getHint();
        CharSequence errorText = layout.getError();
        CharSequence counterDesc = layout.getCounterOverflowDescription();
        boolean showingText = !TextUtils.isEmpty(text);
        boolean hasHint = !TextUtils.isEmpty(hintText);
        boolean showingError = !TextUtils.isEmpty(errorText);
        boolean contentInvalid = showingError || !TextUtils.isEmpty(counterDesc);

        if (showingText) {
            info.setText(text);
        } else if (hasHint) {
            info.setText(hintText);
        }

        if (hasHint) {
            info.setHintText(hintText);
            info.setShowingHintText(!showingText && hasHint);
        }

        if (contentInvalid) {
            info.setError(showingError ? errorText : counterDesc);
            info.setContentInvalid(true);
        }
    }
}

并且通过调用以下公共方法将其应用于 TextInputLayout：

public void setTextInputAccessibilityDelegate(TextInputLayout.AccessibilityDelegate delegate) {
    if (editText != null) {
        ViewCompat.setAccessibilityDelegate(editText, delegate);
    }
}

因此，我们可以扩展：

TextInputLayout.AccessibilityDelegate 类并重写 onInitializeAccessibilityNodeInfo() 以仅宣布需要的内容。例如，在您的情况下，您可以执行以下操作：

private class CustomTextInputLayoutAccessibilityDelegate extends TextInputLayout.AccessibilityDelegate{

    private final TextInputLayout layout;


    public CustomTextInputLayoutAccessibilityDelegate(TextInputLayout layout) {
        super(layout);
        this.layout = layout;
    }

    @Override
    public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
        super.onInitializeAccessibilityNodeInfo(host, info);
        EditText editText = layout.getEditText();
        CharSequence text = (editText != null) ? editText.getText() : null;
        CharSequence hintText = layout.getHint();
        CharSequence errorText = layout.getError();
        //CharSequence counterDesc = layout.getCounterOverflowDescription();
        boolean showingText = !TextUtils.isEmpty(text);
        boolean hasHint = !TextUtils.isEmpty(hintText);
        //boolean showingError = !TextUtils.isEmpty(errorText);
        //boolean contentInvalid = showingError || !TextUtils.isEmpty(counterDesc);

        if (showingText) {
            info.setText(text);
        } else if (hasHint) {
            info.setText("");
        }

        if (hasHint) {
            info.setHintText("");
            info.setShowingHintText(!showingText && hasHint);
        }

        //if (contentInvalid) {
        //    info.setError(showingError ? errorText : counterDesc);
        //    info.setContentInvalid(true);
        //}
    }
}

然后调用：

tilPassword.setTextInputAccessibilityDelegate(new CustomTextInputLayoutAccessibilityDelegate(tilPassword));