content: package com.cjj.buttomsheetdemo;
  
  import android.os.Bundle;
  import android.support.annotation.NonNull;
  import android.support.design.widget.BottomSheetBehavior;
  import android.support.design.widget.CoordinatorLayout;
  import android.support.v7.app.AppCompatActivity;
  import android.util.Log;
  import android.view.View;
  
  /**
   * Created by cjj on 2016/2/25.
   */
  public class NestedScrollViewActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_ns);
  
          // The View with the BottomSheetBehavior
          CoordinatorLayout coordinatorLayout = (CoordinatorLayout) findViewById(R.id.cl);
          View bottomSheet = coordinatorLayout.findViewById(R.id.bottom_sheet);
          final BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);
          behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
              @Override
              public void onStateChanged(@NonNull View bottomSheet, int newState) {
                  //这里是bottomSheet 状态的改变，根据slideOffset可以做一些动画
                  Log.i("cjj", "newState--->" + newState);
  //                ViewCompat.setScaleX(bottomSheet,1);
  //                ViewCompat.setScaleY(bottomSheet,1);
              }
  
              @Override
              public void onSlide(@NonNull View bottomSheet, float slideOffset) {
                  //这里是拖拽中的回调，根据slideOffset可以做一些动画
                  Log.i("cjj", "slideOffset=====》" + slideOffset);
  //                ViewCompat.setScaleX(bottomSheet,slideOffset);
  //                ViewCompat.setScaleY(bottomSheet,slideOffset);
              }
          });
  
          findViewById(R.id.tv).setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  if (behavior.getState() == BottomSheetBehavior.STATE_COLLAPSED) {
                      behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                  } else {
                      behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
                  }
              }
          });
  
      }
  
  }
  