public class SelectDialog extends AlertDialog{public SelectDialog(Context context, int theme) {super(context, theme);
}public SelectDialog(Context context) {super(context);
}@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.slt_cnt_type);
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:padding="10dp" android:layout_width="115dp" android:layout_height="wrap_content" android:background="@color/blue"><Button android:layout_height="wrap_content" android:background="#00000000" android:layout_width="fill_parent" android:text="全部联系人" android:paddingTop="5dp" android:paddingBottom="5dp" android:paddingLeft="10dp" android:gravity="left|center_vertical" android:id="@+id/btnSltCntAll"></Button><Button android:layout_height="wrap_content" android:background="#00000000" style="@drawable/greenhand_button" android:text="咕咚用户" android:gravity="left|center_vertical" android:paddingBottom="5dp" android:paddingTop="5dp" android:paddingLeft="10dp" android:paddingRight="10dp" android:layout_width="fill_parent" android:id="@+id/btnSltGudongUser"></Button><Button style="@drawable/greenhand_button" android:background="#00000000" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="推荐用户" android:gravity="left|center_vertical" android:paddingTop="5dp" android:paddingBottom="5dp" android:paddingLeft="10dp" android:id="@+id/btnSltRecommend"></Button>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources><color name="transparent">#00000000</color>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources><style name="dialog" parent="@android:style/Theme.Dialog"><item name="android:windowFrame">@null</item><!--边框--><item name="android:windowIsFloating">true</item><!--是否浮现在activity之上--><item name="android:windowIsTranslucent">false</item><!--半透明--><item name="android:windowNoTitle">true</item><!--无标题--><item name="android:windowBackground">@color/transparent</item><!--背景透明--><item name="android:backgroundDimEnabled">false</item><!--模糊--></style>
</resources>

SelectDialog selectDialog = new SelectDialog(this,R.style.dialog);//创建Dialog并设置样式主题
Window win = selectDialog.getWindow();
LayoutParams params = new LayoutParams();
params.x = -80;//设置x坐标
params.y = -60;//设置y坐标
win.setAttributes(params);
selectDialog.setCanceledOnTouchOutside(true);//设置点击Dialog外部任意区域关闭Dialog
selectDialog.show();