这次带来的是BottomSheetBehavior的简单使用，BottomSheetBehavior是Android Support Library23.2中引入的，它可以轻松实现底部动作条功能。

使用方法

●xml布局

     
         
      
               //按钮要使用布局包裹否则会浮在BottomSheetBehavior之上        
           
          
              
           
      
     

●Activity代码

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final BottomSheetBehavior bottomSheetBehavior=BottomSheetBehavior.from(findViewById(R.id.design_bottom_sheet1));        //设置默认先隐藏        bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);        findViewById(R.id.bt).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {            //根据状态不同显示隐藏                if (bottomSheetBehavior.getState() == BottomSheetBehavior.STATE_HIDDEN) {                    bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);                } else if (bottomSheetBehavior.getState() == BottomSheetBehavior.STATE_COLLAPSED) {                    bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);                }            }        });        //设置监听事件           bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {            @Override            public void onStateChanged(@NonNull View bottomSheet, int newState) {                //拖动            }            @Override            public void onSlide(@NonNull View bottomSheet, float slideOffset) {                //状态变化            }        });    }}

扩展（BottomSheetDialogFragment实现底部弹窗）

●xml布局

●BottomSheetDialogFragment代码

public class BottomSheetDialogFragmenttest extends BottomSheetDialogFragment {    @Nullable    @Override    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        return inflater.inflate(R.layout.test,container,false);    }}

●Activity代码

findViewById(R.id.bt).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                BottomSheetDialogFragmenttest bottomSheetDialogFragmenttest=new BottomSheetDialogFragmenttest();               bottomSheetDialogFragmenttest.show(getSupportFragmentManager(),BottomSheetDialogFragmenttest.class.getSimpleName());            }        });