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KeyboardChangeListener.java
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KeyboardChangeListener.java
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/*
* cyborg-core is an extendable module based framework for Android.
*
* Copyright (C) 2018 Adam van der Kruk aka TacB0sS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.nu.art.cyborg.core;
import android.app.Activity;
import android.graphics.Rect;
import android.os.Build;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import com.nu.art.belog.Logger;
import com.nu.art.core.generics.Processor;
import com.nu.art.cyborg.core.abs.Cyborg;
import com.nu.art.cyborg.core.interfaces.ActivityLifeCycleImpl;
public class KeyboardChangeListener
extends Logger {
public interface OnKeyboardVisibilityListener {
void onKeyboardVisibilityChanged();
}
private final Activity activity;
private final Cyborg cyborg;
private OnGlobalLayoutListener layoutChangeListener;
KeyboardChangeListener(Cyborg cyborg, Activity activity) {
this.cyborg = cyborg;
this.activity = activity;
activity.getApplication().registerActivityLifecycleCallbacks(new ActivityLifeCycleImpl() {
@Override
public void onActivityResumed(Activity activity) {
if (KeyboardChangeListener.this.activity != activity)
return;
addLayoutChangeListener();
}
@Override
public void onActivityPaused(Activity activity) {
if (KeyboardChangeListener.this.activity != activity)
return;
removeLayoutChangeListener();
}
@Override
public void onActivityDestroyed(Activity activity) {
if (KeyboardChangeListener.this.activity != activity)
return;
removeLayoutChangeListener();
}
});
}
private void removeLayoutChangeListener() {
final View activityRootView = ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0);
if (activityRootView == null)
return;
ViewTreeObserver viewTreeObserver = activityRootView.getViewTreeObserver();
if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) {
viewTreeObserver.removeOnGlobalLayoutListener(layoutChangeListener);
} else
viewTreeObserver.removeGlobalOnLayoutListener(layoutChangeListener);
}
private final Rect r = new Rect();
private final int DefaultKeyboardDP = 100;
// From @nathanielwolf answer... Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff (https://stackoverflow.com/a/27005787/348189)
private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);
private void addLayoutChangeListener() {
final View activityRootView = ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0);
if (activityRootView == null)
return;
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(layoutChangeListener = new OnGlobalLayoutListener() {
private boolean wasOpened;
@Override
public void onGlobalLayout() {
final boolean isShown = isKeyboardShown(activityRootView);
if (isShown == wasOpened)
return;
wasOpened = isShown;
cyborg.dispatchEvent(KeyboardChangeListener.this, "Keyboard visibility changed: " + isShown, OnKeyboardVisibilityListener.class, new Processor<OnKeyboardVisibilityListener>() {
@Override
public void process(OnKeyboardVisibilityListener listener) {
listener.onKeyboardVisibilityChanged();
}
});
}
});
}
public boolean isKeyboardShown(View activityRootView) {
int estimatedKeyboardHeight = cyborg.dpToPx(EstimatedKeyboardDP);
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
return heightDiff >= estimatedKeyboardHeight;
}
}