键盘后退按钮事件KeyEvent.KEYCODE_back在更新到Android 13后不工作

Question

我已将targetSdkVersion和compileSdkVersion升级到33。之后，键盘返回事件不会被触发。

根据Android文档，建议迁移到Predictive back手势。我已经尝试使用建议的解决方案来使用OnBackInvokedDispatcher和OnBackPressedCallback，但它们都没有帮助获取键盘返回事件。

// Add onBackPressed as default back behavior.
mDefaultBackCallback = this::onBackPressed;
getOnBackInvokedDispatcher().registerOnBackInvokedCallback(
OnBackInvokedDispatcher.PRIORITY_DEFAULT, mDefaultBackCallback);
mDefaultBackCallback = null;

在更新到Android 13之前，我能够在上获得回调

@Override
public boolean onKeyPreIme(int keyCode, KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {resetView();}
return super.onKeyPreIme(keyCode, event);
}

在这个问题上有什么帮助吗？

Answer 1

你试过这个吗

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if(event.getKeyCode() == KeyEvent.KEYCODE_BACK){
Log.d("Test","Back Pressed");
return viewModel.backClicked();
}
return super.dispatchKeyEvent(event);
}

Answer 2

我遇到了AppCompatEditText的实现无法再工作的问题。

我使用的是：

class CustomAppCompatEditText : AppCompatEditText {
constructor(context: Context) : super(context)
constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(
context,
attrs,
defStyleAttr
)
override fun onKeyPreIme(keyCode: Int, event: KeyEvent?): Boolean {
if (keyCode == KeyEvent.KEYCODE_BACK) {
clearFocus()
}
return super.onKeyPreIme(keyCode, event)
}
override fun onEditorAction(actionCode: Int) {
if (actionCode == EditorInfo.IME_ACTION_DONE) {
clearFocus()
}
super.onEditorAction(actionCode)
}
}

我创建了一个名为KeyboardHelper的新类。它看起来像这样：

object KeyboardHelper {
fun View?.clearFocusOnKeyboardHidden() {
var wasOpened = false
val listener = ViewTreeObserver.OnGlobalLayoutListener {
val isOpen = isKeyboardVisible(this@clearFocusOnKeyboardHidden?.context?.getActivity())
if (isOpen == wasOpened) {
// The keyboard state has not changed yet!
return@OnGlobalLayoutListener
}
wasOpened = isOpen
if (this@clearFocusOnKeyboardHidden?.isFocused == true && !isOpen) {
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}
}
this?.viewTreeObserver?.addOnGlobalLayoutListener(listener)
}
private fun isKeyboardVisible(activity: Activity?): Boolean {
activity ?: return false
val outRect = Rect()
val activityRoot = activity.getActivityRoot()
activityRoot.getWindowVisibleDisplayFrame(outRect)
val location = IntArray(2)
activity.getContentRoot().getLocationOnScreen(location)
val screenHeight = activityRoot.rootView.height
val heightDiff = screenHeight - outRect.height() - location[1]
return heightDiff > screenHeight * 0.15
}
private fun Context.getActivity(): Activity? {
return when (this) {
is Activity -> this
is ContextWrapper -> this.baseContext.getActivity()
else -> null
}
}
private fun Activity.getActivityRoot(): View {
return this.getContentRoot().rootView
}
private fun Activity.getContentRoot(): ViewGroup {
return this.findViewById(android.R.id.content)
}
}

现在我对CustomAppCompatEditText类做了一些更改：

class CustomAppCompatEditText : AppCompatEditText {
constructor(context: Context) : super(context)
constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(
context,
attrs,
defStyleAttr
)
init {
clearFocusOnKeyboardHidden()
}
override fun onEditorAction(actionCode: Int) {
if (actionCode == EditorInfo.IME_ACTION_DONE) {
clearFocus()
}
super.onEditorAction(actionCode)
}
}

毕竟，它现在又像以前一样工作了。键盘代码的源代码来自这里：https://github.com/yshrsmz/KeyboardVisibilityEvent