先给大家展示下效果图，大家觉效果满意，请参考实现代码。

直接上代码：

private void setDialog(){View view = getLayoutInflater().inflate(R.layout.dialog_country, null);mDialog = new Dialog(this);mDialog.setContentView(view, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));Window window = mDialog.getWindow();WindowManager.LayoutParams wl = window.getAttributes();wl.x = 0;wl.y = getWindowManager().getDefaultDisplay().getHeight();wl.width = ViewGroup.LayoutParams.MATCH_PARENT;wl.height = ViewGroup.LayoutParams.WRAP_CONTENT;mDialog.onWindowAttributesChanged(wl);mDialog.setCanceledOnTouchOutside(true);mDialog.show();Button btnChina = (Button) view.findViewById(R.id.btnChina);Button btnUSA = (Button) view.findViewById(R.id.btnUSA);Button btnUK = (Button) view.findViewById(R.id.btnUK);Button btnCancel = (Button) view.findViewById(R.id.btnCancel);btnChina.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmQuery.id(R.id.btnCountry).getTextView().setText("China");mDialog.dismiss();} });btnUSA.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmQuery.id(R.id.btnCountry).getTextView().setText("USA");mDialog.dismiss();} });btnUK.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmQuery.id(R.id.btnCountry).getTextView().setText("UK");mDialog.dismiss();} });btnCancel.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmDialog.dismiss();} });}

首先inflate一个xml文件，产生一个view；再创建一个Dialog，设置Dialog的View为inflate的view；然后通过WindowManager.LayoutParams设置Dialog的长度、宽度、显示的位置等等，最后setCanceledOnTouchOutside(true)，点击其他地方可以退出Dialog。