使用Bottom Sheet实现底部菜单，初步识别

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MainActivity

public class MainActivity extends AppCompatActivity {    Button mShowBottomSheet;    RelativeLayout design_bottom_sheet;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获取到Bottom Sheet对象        View bottomSheet = findViewById(R.id.design_bottom_sheet);        final BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);        //默认设置为隐藏        behavior.setState(BottomSheetBehavior.STATE_HIDDEN);        mShowBottomSheet = (Button) findViewById(R.id.button);        design_bottom_sheet=(RelativeLayout)findViewById(R.id.design_bottom_sheet);        mShowBottomSheet.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                showBottomSheet(behavior);            }        });        design_bottom_sheet.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(MainActivity.this,"111",Toast.LENGTH_SHORT).show();                behavior.setState(BottomSheetBehavior.STATE_HIDDEN);            }        });    }    private void showBottomSheet(BottomSheetBehavior behavior) {        if (behavior.getState() == BottomSheetBehavior.STATE_HIDDEN) {            behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);            mShowBottomSheet.setText("hide_bottom_sheet");        } else {            behavior.setState(BottomSheetBehavior.STATE_HIDDEN);            mShowBottomSheet.setText("show_bottom_sheet");        }    }}

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="vertical"        android:paddingBottom="10dp"        android:paddingLeft="10dp"        android:paddingRight="10dp"        android:paddingTop="10dp">        <Button            android:id="@+id/button"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_centerHorizontal="true"            android:text="Show Bottom Sheet"/>        <Button            android:id="@+id/fragmentbutton"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_centerHorizontal="true"            android:text="Show Bottom Sheet Model"/>    </LinearLayout>    <RelativeLayout        android:id="@+id/design_bottom_sheet"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@color/colorAccent"        android:paddingBottom="10dp"        android:paddingLeft="10dp"        android:paddingRight="10dp"        android:paddingTop="10dp"        app:behavior_hideable="true"        app:behavior_peekHeight="100dp"        app:elevation="4dp"        app:layout_behavior="@string/bottom_sheet_behavior">        <TextView            android:id="@+id/tv1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="feng"            android:layout_marginTop="30dp"            />    </RelativeLayout></android.support.design.widget.CoordinatorLayout>

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