Android 监听键盘弹起

今天看到网上一个关于android监听键盘弹起的功能，写了这篇文章记录下

KeyboardChangeListener，主要代码：

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);
}
}
}

}

posted @ 2017-09-04 15:36  小dai  阅读(213)  评论(0)    收藏  举报