//记录原始窗口高度
private int mWindowHeight =0;
private ViewTreeObserver.OnGlobalLayoutListenermGlobalLayoutListener =new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect r =new Rect();
//获取当前窗口实际的可见区域
getWindow().getDecorView().getWindowVisibleDisplayFrame(r);
int height = r.height();
if (mWindowHeight ==0) {
//一般情况下，这是原始的窗口高度
mWindowHeight = height;
}else {
if (mWindowHeight != height) {//https://www.jianshu.com/p/09456c2fceff
//两次窗口高度相减，就是软键盘高度
int softKeyboardHeight =mWindowHeight - height;
setBottom(softKeyboardHeight);
}
}
}
};
private void setListenerToRootView() {
final View rootView = getWindow().getDecorView().findViewById(android.R.id.content);
rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
boolean mKeyboardUp = isKeyboardShown(rootView);
if (mKeyboardUp) {
}else {
setBottom(0);
}
}
});
}
private void setBottom(int keyboardHeight) {
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)btn_bottom.getLayoutParams();
params.bottomMargin = keyboardHeight;
btn_bottom.setLayoutParams(params);
}
private boolean isKeyboardShown(View rootView) {
final int softKeyboardHeight =100;
Rect r =new Rect();
rootView.getWindowVisibleDisplayFrame(r);
DisplayMetrics dm = rootView.getResources().getDisplayMetrics();
int heightDiff = rootView.getBottom() - r.bottom;
return heightDiff > softKeyboardHeight * dm.density;
}
getWindow().getDecorView().getViewTreeObserver().addOnGlobalLayoutListener(mGlobalLayoutListener);
@Override
protected void onDestroy() {
super.onDestroy();
getWindow().getDecorView().getViewTreeObserver().removeOnGlobalLayoutListener(mGlobalLayoutListener);
}
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