PopupWindow(点击头像，底部弹出选项)

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void leoClick(View view) {
View popupView = getLayoutInflater().inflate(R.layout.popup_view, null);

                popupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT, true);
//                在指定view下方多少
                popupWindow.showAsDropDown(llPersonDown, 0, 370);

// 获取到Button对象，可以做相应的点击事件
                Button btn1 = popupView.findViewById(R.id.btn1);
                btn1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        openCamera();
                    }
                });
                Button btn2 = popupView.findViewById(R.id.btn2);
                btn2.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        openAlbum();
                    }
                });
                Button btn3 = popupView.findViewById(R.id.btn3);
                btn3.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (popupWindow.isShowing()) {
                            popupWindow.dismiss();
                        }
                    }
                });


    }
}

activity_main

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="leoClick"
        android:text="显示对话框" />

popup_view

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

            android:background="@color/white"
        android:id="@+id/btn1"
        android:textColor="@color/stroke_grey"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text="拍照"
        android:textSize="18sp" />

            android:layout_marginLeft="21dp"
        android:layout_marginRight="21dp"
        android:layout_width="match_parent"
        android:layout_height="1dp" />

            android:id="@+id/btn2"
        android:textColor="@color/stroke_grey"
        android:background="@color/white"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text="从手机相册选中"
        android:textSize="18sp" />

            android:layout_marginLeft="21dp"
        android:layout_marginRight="21dp"
        android:layout_width="match_parent"
        android:layout_height="1dp" />

            android:id="@+id/btn3"
        android:textColor="@color/stroke_grey"
        android:background="@color/white"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text="取消"
        android:textSize="18sp" />