悬浮对话框的实现

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(){
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mQuery.id(R.id.btnCountry).getTextView().setText("China");
                mDialog.dismiss();
            }            
        });
        btnUSA.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mQuery.id(R.id.btnCountry).getTextView().setText("USA");
                mDialog.dismiss();
            }            
        });
        btnUK.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mQuery.id(R.id.btnCountry).getTextView().setText("UK");
                mDialog.dismiss();
            }            
        });
        btnCancel.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mDialog.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。运行效果如下：