android api25 点击隐藏BottomSheet需求的

<pre>
public class BottomSheetBehaviorActivity extends AppCompatActivity {

private BottomSheetBehavior mBottomSheetBehavior;

private BottomSheetDialog mBottomSheetDialog;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.bsbehavior_activity);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    findViewById(R.id.btn_bottom_sheet_control).setOnClickListener(onClickListener);
    findViewById(R.id.btn_bottom_dialog_control).setOnClickListener(onClickListener);

    mBottomSheetBehavior = BottomSheetBehavior.from(findViewById(R.id.tab_layout));

    createBottomSheetDialog();
}

private void createBottomSheetDialog() {
    mBottomSheetDialog = new BottomSheetDialog(this);
    View view = LayoutInflater.from(this).inflate(R.layout.dialog_bottom_sheet, null, false);
    mBottomSheetDialog.setContentView(view);

    RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
    recyclerView.setHasFixedSize(true);
    List<String> list = new ArrayList<>();
    for (int i = 0; i < 20; i++) {
        list.add("我是第" + i + "个");
    }
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
    linearLayoutManager.setSmoothScrollbarEnabled(true);
    recyclerView.setLayoutManager(linearLayoutManager);
    ListRecyclerAdapter adapter = new ListRecyclerAdapter(list);
    recyclerView.setAdapter(adapter);

    setBehaviorCallback();
}

private void setBehaviorCallback() {
    View view = mBottomSheetDialog.getDelegate().findViewById(android.support.design.R.id.design_bottom_sheet);
    final BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(view);
    bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
                mBottomSheetDialog.dismiss();
                bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    });
}

private View.OnClickListener onClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btn_bottom_sheet_control) {

            System.out.println("sss:" + mBottomSheetBehavior.getState());

            //api25 时这样写！！一开始的状态默认为STATE_COLLAPSED，然后经过设置为STATE_HIDDEN，然后再经过设置为STATE_EXPANDED，然后再次回到STATE_EXPANDED上，所以可以写或运算
            if (mBottomSheetBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED || mBottomSheetBehavior.getState() == BottomSheetBehavior.STATE_COLLAPSED) {

                mBottomSheetBehavior.setHideable(true);
                mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);

            } else if (mBottomSheetBehavior.getState() == BottomSheetBehavior.STATE_HIDDEN) {
                mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
            }


        } else if (v.getId() == R.id.btn_bottom_dialog_control) {
            if (mBottomSheetDialog.isShowing()) {
                mBottomSheetDialog.dismiss();
            } else {
                mBottomSheetDialog.show();
            }
        }
    }
};

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
        finish();
    }
    return true;
}

}
</pre>