Android自定义Dialog背景透明及显示位置设置

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);
}
}

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<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:padding="10dp" android:layout_115dp" android:layout_wrap_content" android:background="@color/blue">
    wrap_content" android:background="#00000000" android:layout_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">
    wrap_content" android:background="#00000000" color: rgba(128, 0, 0, 1)">"@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_fill_parent" android:id="@+id/btnSltGudongUser">
    "@drawable/greenhand_button" android:background="#00000000" android:layout_wrap_content" android:layout_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">

"1.0" encoding="utf-8"?>

  "transparent">#00000000

"1.0" encoding="utf-8"?>

    

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();