githup中找到：https://github.com/yescpu/KeyboardChangeListener

import android.app.Activity;
import android.os.Build;
import android.util.Log;
import android.view.View;
import android.view.ViewTreeObserver;

/**
* simple and powerful Keyboard show/hidden listener,view {@android.R.id.content} and {@ViewTreeObserver.OnGlobalLayoutListener}
* Created by yes.cpu@gmail.com 2016/7/13.
*/
public class KeyboardChangeListener implements ViewTreeObserver.OnGlobalLayoutListener {
private static final String TAG = "ListenerHandler";
private View mContentView;
private int mOriginHeight;
private int mPreHeight;
private KeyBoardListener mKeyBoardListen;

public interface KeyBoardListener {
/**
* call back
* @param isShow true is show else hidden
* @param keyboardHeight keyboard height
*/
void onKeyboardChange(boolean isShow, int keyboardHeight);
}

public void setKeyBoardListener(KeyBoardListener keyBoardListen) {
this.mKeyBoardListen = keyBoardListen;
}

public KeyboardChangeListener(Activity contextObj) {
if (contextObj == null) {
Log.i(TAG, "contextObj is null");
return;
}
mContentView = findContentView(contextObj);
if (mContentView != null) {
addContentTreeObserver();
}
}

private View findContentView(Activity contextObj) {
return contextObj.findViewById(android.R.id.content);
}

private void addContentTreeObserver() {
mContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
}

@Override
public void onGlobalLayout() {
int currHeight = mContentView.getHeight();
if (currHeight == 0) {
Log.i(TAG, "currHeight is 0");
return;
}
boolean hasChange = false;
if (mPreHeight == 0) {
mPreHeight = currHeight;
mOriginHeight = currHeight;
} else {
if (mPreHeight != currHeight) {
hasChange = true;
mPreHeight = currHeight;
} else {
hasChange = false;
}
}
if (hasChange) {
boolean isShow;
int keyboardHeight = 0;
if (mOriginHeight == currHeight) {
//hidden
isShow = false;
} else {
//show
keyboardHeight = mOriginHeight - currHeight;
isShow = true;
}

if (mKeyBoardListen != null) {
mKeyBoardListen.onKeyboardChange(isShow, keyboardHeight);
}
}
}

public void destroy() {
if (mContentView != null) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
mContentView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
}
}
}

KeyboardChangeListener

simple and powerful Keyboard show/hidden change listener,without having to add a layout and can run in every Activity;

useage

make activity:

android:windowSoftInputMode="adjustResize"

java:

new KeyboardChangeListener(this).setKeyBoardListener(new KeyboardChangeListener.KeyBoardListener() {
@Override
public void onKeyboardChange(boolean isShow, int keyboardHeight) {
Log.d(TAG, "isShow = [" + isShow + "], keyboardHeight = [" + keyboardHeight + "]");
}
});

#enjoy！

感谢作者！