Android系统中是否有一种方法可以检测软件(也就是Android。“软”)键盘在屏幕上可见吗?
当前回答
这应该工作,如果你需要检查键盘状态:
fun Activity.isKeyboardOpened(): Boolean {
val r = Rect()
val activityRoot = getActivityRoot()
val visibleThreshold = dip(UiUtils.KEYBOARD_VISIBLE_THRESHOLD_DP)
activityRoot.getWindowVisibleDisplayFrame(r)
val heightDiff = activityRoot.rootView.height - r.height()
return heightDiff > visibleThreshold;
}
fun Activity.getActivityRoot(): View {
return (findViewById<ViewGroup>(android.R.id.content)).getChildAt(0);
}
UiUtils的地方。KEYBOARD_VISIBLE_THRESHOLD_DP = 100, dip()是一个anko函数,转换dpToPx:
fun dip(value: Int): Int {
return (value * Resources.getSystem().displayMetrics.density).toInt()
}
其他回答
对于我所需要的需求来说,这要简单得多。希望这能有所帮助:
关于MainActivity:
public void dismissKeyboard(){
InputMethodManager imm =(InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(mSearchBox.getWindowToken(), 0);
mKeyboardStatus = false;
}
public void showKeyboard(){
InputMethodManager imm =(InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
mKeyboardStatus = true;
}
private boolean isKeyboardActive(){
return mKeyboardStatus;
}
mKeyboardStatus的默认基元布尔值将初始化为false。
然后检查如下值,并执行相应的操作:
mSearchBox.requestFocus();
if(!isKeyboardActive()){
showKeyboard();
}else{
dismissKeyboard();
}
我用这个作为基础:https://rogerkeays.com/how-to-check-if-the-software-keyboard-is-shown-in-android
/**
* To capture the result of IMM hide/show soft keyboard
*/
public class IMMResult extends ResultReceiver {
public int result = -1;
public IMMResult() {
super(null);
}
@Override
public void onReceiveResult(int r, Bundle data) {
result = r;
}
// poll result value for up to 500 milliseconds
public int getResult() {
try {
int sleep = 0;
while (result == -1 && sleep < 500) {
Thread.sleep(100);
sleep += 100;
}
} catch (InterruptedException e) {
Log.e("IMMResult", e.getMessage());
}
return result;
}
}
然后写了这个方法:
public boolean isSoftKeyboardShown(InputMethodManager imm, View v) {
IMMResult result = new IMMResult();
int res;
imm.showSoftInput(v, 0, result);
// if keyboard doesn't change, handle the keypress
res = result.getResult();
if (res == InputMethodManager.RESULT_UNCHANGED_SHOWN ||
res == InputMethodManager.RESULT_UNCHANGED_HIDDEN) {
return true;
}
else
return false;
}
然后你可以用它来测试所有可能打开软键盘的字段(EditText, AutoCompleteTextView等):
InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
if(isSoftKeyboardShown(imm, editText1) | isSoftKeyboardShown(imm, autocompletetextview1))
//close the softkeyboard
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
当然不是一个理想的解决方案,但它可以完成工作。
这是如何在一个片段中使用软键盘状态监听器(适用于API 21及以上)
private var currentWindowInsets: WindowInsetsCompat = WindowInsetsCompat.Builder().build()
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
setWindowInsetsAnimationCallback(requireView().rootView, object : Callback(DISPATCH_MODE_CONTINUE_ON_SUBTREE) {
override fun onProgress(insets: WindowInsetsCompat, runningAnimations: MutableList<WindowInsetsAnimationCompat>): WindowInsetsCompat {
currentWindowInsets = insets
return insets
}
override fun onEnd(animation: WindowInsetsAnimationCompat) {
super.onEnd(animation)
val keyboardIsVisible = currentWindowInsets.isVisible(WindowInsetsCompat.Type.ime())
if (keyboardIsVisible) { //do your stuff }
}
})
}
使用androidx核心版本1.5.0-alpha02中的新特性WindowInsetsCompat,您可以轻松地检查软键盘的可见性,如下所示
摘自reddit评论
瓦尔View)。布尔keyboardIsVisible: 赢了 toWindowInsetsCompat (rootWindowInsets)。 isVisible (WindowInsetsCompat。。火车(型)
一些关于向后兼容性的说明,引用自发行说明
新功能 windowswinsetscompat api已经更新为平台中的api Android 11。这包括新的ime()插入类型,它允许 检查屏幕上键盘的可见性和大小。 一些关于ime()类型的警告,它在API 23+上工作非常可靠 当你的Activity使用adjuststresize窗口软输入模式时。 如果您使用的是adjustPan模式,它应该工作可靠 回到API 14。
参考文献
Twitter WindowInsetsCompat公告 Reddit的线程 Androidx Core 1.5.0-alpha02发布说明 WindowInsetsCompat文档
final View activityRootView = findViewById(R.id.rootlayout);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect r = new Rect();
activityRootView.getWindowVisibleDisplayFrame(r);
int screenHeight = activityRootView.getRootView().getHeight();
Log.e("screenHeight", String.valueOf(screenHeight));
int heightDiff = screenHeight - (r.bottom - r.top);
Log.e("heightDiff", String.valueOf(heightDiff));
boolean visible = heightDiff > screenHeight / 3;
Log.e("visible", String.valueOf(visible));
if (visible) {
Toast.makeText(LabRegister.this, "I am here 1", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(LabRegister.this, "I am here 2", Toast.LENGTH_SHORT).show();
}
}
});
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