android 实现按钮浮动在键盘上方的实例代码

获取当前屏幕的高度

Display defaultDisplay = mcontext.getWindowManager().getDefaultDisplay();
  Point point = new Point();
  defaultDisplay.getSize(point);
  height = point.y;

获取当前屏幕可见区域的高度，用于判断当前键盘是否隐藏或显示

public void setFloatView(View root,View floatview){
  this.root = root; //根节点
  listener = new ViewTreeObserver.OnGlobalLayoutListener() {
   @Override
   public void onGlobalLayout() {
    Rect r = new Rect();
    mcontext.getWindow().getDecorView().getWindowVisibleDisplayFrame(r);
    int heightDifference = height - (r.bottom - r.top); // 实际高度减去可视图高度即是键盘高度
    boolean isKeyboardShowing = heightDifference > height / 3;
    if(isKeyboardShowing){
     //键盘显示 
    }else{
     //键盘隐藏 
    }
   }
  };
  root.getViewTreeObserver().addOnGlobalLayoutListener(listener);
 }

当键盘隐藏时让按钮 动画移动至原有位置，当前键盘显示时让按钮动画移动至当前键盘的高度上方

if(isKeyboardShowing){
    //键盘显示
    floatview.animate().translationY(-heightDifference).setDuration(0).start();
   }else{
    //键盘隐藏
    floatview.animate().translationY(0).start();
   }

为了方便封装了一个工具类 FloatBtnUtil

public class FloatBtnUtil {
 
 private static int height = 0;
 private Activity mcontext;
 private ViewTreeObserver.OnGlobalLayoutListener listener;
 private View root;
 
 public FloatBtnUtil(Activity mcontext){
  this.mcontext = mcontext;
  if (height == 0){
   Display defaultDisplay = mcontext.getWindowManager().getDefaultDisplay();
   Point point = new Point();
   defaultDisplay.getSize(point);
   height = point.y;
  }
 }
 
 public void setFloatView(View root,View floatview){
  this.root = root; //视图根节点 floatview // 需要显示在键盘上的View组件
  listener = new ViewTreeObserver.OnGlobalLayoutListener() {
   @Override
   public void onGlobalLayout() {
    Rect r = new Rect();
    mcontext.getWindow().getDecorView().getWindowVisibleDisplayFrame(r);
    int heightDifference = height - (r.bottom - r.top);
    boolean isKeyboardShowing = heightDifference > height / 3;
    if(isKeyboardShowing){
     floatview.animate().translationY(-heightDifference).setDuration(0).start();
    }else{
     floatview.animate().translationY(0).start();
    }
   }
  };
  root.getViewTreeObserver().addOnGlobalLayoutListener(listener);
 }
 
 public void clearFloatView(){
  if (listener != null && root != null)
  root.getViewTreeObserver().removeOnGlobalLayoutListener(listener);
 }
 
}

private void initFloatBtn() {
 FloatBtnUtil floatBtnUtil = new FloatBtnUtil(this);
 LinearLayout lin_bottom = (LinearLayout) this.findViewById(R.id.lin_bottom);
 LinearLayout lin_root = (LinearLayout)this.findViewById(R.id.lin_root);
 floatBtnUtil.setFloatView(lin_root,lin_bottom);
}

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