Fix keyboard not showing when search fragment shows #955

app/src/main/java/code/name/monkey/retromusic/extensions/ViewExtensions.kt

@@ -15,9 +15,12 @@
 package code.name.monkey.retromusic.extensions
 
 import android.animation.ObjectAnimator
+import android.content.Context
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.view.ViewTreeObserver
+import android.view.inputmethod.InputMethodManager
 import android.widget.EditText
 import androidx.annotation.LayoutRes
 import androidx.core.animation.doOnEnd
@@ -76,3 +79,38 @@ fun BottomSheetBehavior<*>.peekHeightAnimate(value: Int) {
         }
 }
 
+fun View.focusAndShowKeyboard() {
+    /**
+     * This is to be called when the window already has focus.
+     */
+    fun View.showTheKeyboardNow() {
+        if (isFocused) {
+            post {
+                // We still post the call, just in case we are being notified of the windows focus
+                // but InputMethodManager didn't get properly setup yet.
+                val imm =
+                    context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+                imm.showSoftInput(this, InputMethodManager.SHOW_IMPLICIT)
+            }
+        }
+    }
+
+    requestFocus()
+    if (hasWindowFocus()) {
+        // No need to wait for the window to get focus.
+        showTheKeyboardNow()
+    } else {
+        // We need to wait until the window gets focus.
+        viewTreeObserver.addOnWindowFocusChangeListener(
+            object : ViewTreeObserver.OnWindowFocusChangeListener {
+                override fun onWindowFocusChanged(hasFocus: Boolean) {
+                    // This notification will arrive just before the InputMethodManager gets set up.
+                    if (hasFocus) {
+                        this@focusAndShowKeyboard.showTheKeyboardNow()
+                        // It’s very important to remove this listener once we are done.
+                        viewTreeObserver.removeOnWindowFocusChangeListener(this)
+                    }
+                }
+            })
+    }
+}