最近在做一个聊天界面 ，为了让界面好看点就把界面设成了沉浸式状态栏，然后发现沉浸式状态栏下点击输入框软键盘会把输入框给遮住，打字的时候根本不知道自己打了什么，用户体验很差。
百度了一下说在AndroidManifest.xml的Activity中添加
android:windowSoftInputMode="stateHidden|adjustPan"
得到的效果是：打开软键盘的时候会把输入框顶到软键盘上面，但是同时我们的标题栏也被顶上去看不见了
但我要的效果是 ：我打开软键盘的时候聊天内容往上顶，标题栏不动
：
在github上面找到了个工具类，并且改了一丢丢代码，实现了自己想要的效果：
引用的时候直接在oncreate调用：
SoftHideKeyBoardUtil.assistActivity(this);
/*** @Author: david.lvfujiang* @Date: /10/10* @Describe:*/public class SoftHideKeyBoardUtil {public static void assistActivity(Activity activity) {new SoftHideKeyBoardUtil(activity);}private Activity activity;private View mChildOfContent;private int usableHeightPrevious;private FrameLayout.LayoutParams frameLayoutParams;private int contentHeight;//获取setContentView本来view的高度private boolean isfirst = true;//只用获取一次private int statusBarHeight;//状态栏高度private SoftHideKeyBoardUtil(Activity activity) {this.activity = activity;//1､找到Activity的最外层布局控件，它其实是一个DecorView,它所用的控件就是FrameLayoutFrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);//2､获取到setContentView放进去的ViewmChildOfContent = content.getChildAt(0);//3､给Activity的xml布局设置View树监听，当布局有变化，如键盘弹出或收起时，都会回调此监听mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {//4､软键盘弹起会使GlobalLayout发生变化public void onGlobalLayout() {if (isfirst) {contentHeight = mChildOfContent.getHeight();//兼容华为等机型isfirst = false;}//5､当前布局发生变化时，对Activity的xml布局进行重绘possiblyResizeChildOfContent();}});//6､获取到Activity的xml布局的放置参数frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();}// 获取界面可用高度，如果软键盘弹起后，Activity的xml布局可用高度需要减去键盘高度private void possiblyResizeChildOfContent() {//1､获取当前界面可用高度，键盘弹起后，当前界面可用布局会减少键盘的高度int usableHeightNow = computeUsableHeight(activity);//2､如果当前可用高度和原始值不一样if (usableHeightNow != usableHeightPrevious) {//3､获取Activity中xml中布局在当前界面显示的高度int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();//4､Activity中xml布局的高度-当前可用高度int heightDifference = usableHeightSansKeyboard - usableHeightNow;//5､高度差大于屏幕1/4时，说明键盘弹出if (heightDifference > (usableHeightSansKeyboard / 4)) {// 6､键盘弹出了，Activity的xml布局高度应当减去键盘高度if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {frameLayoutParams.height = usableHeightSansKeyboard - heightDifference + statusBarHeight;} else {frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;}} else {frameLayoutParams.height = contentHeight;}//7､ 重绘Activity的xml布局mChildOfContent.requestLayout();usableHeightPrevious = usableHeightNow;}}private int computeUsableHeight(Activity activity) {Rect frame = new Rect();activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);int statusBarHeight = frame.top;Rect r = new Rect();mChildOfContent.getWindowVisibleDisplayFrame(r);//这个判断是为了解决19之后的版本在弹出软键盘时，键盘和推上去的布局（adjustResize）之间有白色区域的问题if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {return (r.bottom - r.top) + statusBarHeight;}return (r.bottom - r.top);}}
