Android - 屏幕键盘

Question

I know, it's asked many times, but for old Android versions and not all solutions working.

I need to programmatically control onscreen keyboard on Android 10 system:

• Show onscreen keyboard when I want, not when want Android system (.).
• Hide onscreen keyboard when I want, not when want Android system (.).
• Check whether onscreen keyboard is showed.
• Prevent system from showing/hidding onscreen keyboard - only I will manipulate with it (.).

Code can be in kotlin/java.

Answer 1

Add these two properties to your parent layout (ex: Linear Layout, Relative Layout)

android:focusable="false"
android:focusableInTouchMode="false" 

in your activity:

this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

Alternatively,

1. you could also declare in your manifest file's activity

   <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Main" android:label="@string/app_name" android:windowSoftInputMode="stateHidden" >

2. If you have already been using android:windowSoftInputMode for a value like adjustResize or adjustPan, you can combine two values:

    <activity... android:windowSoftInputMode="stateHidden|adjustPan"... >

show keyboard programmatically:

    public static boolean showKeyboard(View view) {
    if (view == null) {
        return false;
    }
    try {
        InputMethodManager inputManager = (InputMethodManager) view.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        view.requestFocus();
        return inputManager.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT);
    } catch (Exception ignored) {
    }
    return false;
}

hide keyboard:

public static void hideKeyboard(View view) {
    if (view == null) {
        return;
    }
    try {
        InputMethodManager imm = (InputMethodManager) view.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        if (!imm.isActive()) {
            return;
        }
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
        view.clearFocus();
    } catch (Exception e) {
    }
}

on keyboard show listener:

public static void OnkeyBoardShowListener(final Activity activity) {
final View activityRootView = activity.findViewById(android.R.id.content);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
 @Override
  public void onGlobalLayout() {
    Rect rect = new Rect();
    activityRootView.getWindowVisibleDisplayFrame(rect);
    int heightRoot = activityRootView.getRootView().getHeight();
    int heightDiff = heightRoot - rect.bottom;
    if (heightDiff > dpToPx(activity, 200)) {
          //Keyboard is open
    }else if (heightDiff < dpToPx(activity, 200)) {
         //Keyboard is close
    }
   }
 });
}

convert Dp to Px:

private static float dpToPx(Context context, int dp) {
 DisplayMetrics metrics =  context.getResources().getDisplayMetrics();
 return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dp, metrics);
}