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
如你所知,android软件的键盘只有在有可能的输入事件时才可见。换句话说,只有当EditText被聚焦时,键盘才可见。这意味着你可以通过使用OnFocusChangeListener获得键盘是否可见。
//Declare this Globally
public boolean isKeyBoardVisible = false;
//In OnCreate *[For Activity]*, OnCreateView *[For Fragment]*
text_send.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus)
isKeyBoardVisible = true;
else
isKeyBoardVisible = false;
}
});
现在你可以在类的任何地方使用isKeyBoardVisible变量来获取键盘是否打开。这对我来说很有效。
注意:当使用InputMethodManager以编程方式打开键盘时,这个过程不起作用,因为它不调用OnFocusChangeListener。
其他回答
我通过设置一个GlobalLayoutListener来做到这一点,如下所示:
final View activityRootView = findViewById(R.id.activityRoot);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(
new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
int heightView = activityRootView.getHeight();
int widthView = activityRootView.getWidth();
if (1.0 * widthView / heightView > 3) {
//Make changes for Keyboard not visible
} else {
//Make changes for keyboard visible
}
}
});
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();
}
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();
}
}
});
我也遇到过类似的问题。我需要对屏幕上的Enter按钮做出反应(这隐藏了键盘)。在这种情况下,你可以订阅键盘打开的文本视图的OnEditorAction -如果你有多个可编辑框,那么就订阅所有的文本视图。
在你的活动中,你可以完全控制键盘,所以如果你监听所有打开和关闭事件,你就不会面临键盘是否打开的问题。
我把答案转换为kotlin,希望这对kotlin用户有帮助。
private fun checkKeyboardVisibility() {
var isKeyboardShowing = false
binding.coordinator.viewTreeObserver.addOnGlobalLayoutListener {
val r = Rect()
binding.coordinator.getWindowVisibleDisplayFrame(r)
val screenHeight = binding.coordinator.rootView.height
// r.bottom is the position above soft keypad or device button.
// if keypad is shown, the r.bottom is smaller than that before.
val keypadHeight = screenHeight - r.bottom
if (keypadHeight > screenHeight * 0.15) { // 0.15 ratio is perhaps enough to determine keypad height.
// keyboard is opened
if (!isKeyboardShowing) {
isKeyboardShowing = true
}
} else {
// keyboard is closed
if (isKeyboardShowing) {
isKeyboardShowing = false
}
}
}
}
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