android 创建自定义对话框

        final AlertDialog dialog = new AlertDialog.Builder(context).create();
        dialog.show();
        Window window = dialog.getWindow();
        window.setWindowAnimations(R.style.dialogWindowAnim);//设置对话框显示和消失动画

        window.setLayout((int) context.getResources().getDimension(100dp,100dp));//设置对话框的大小

        window.setBackgroundDrawableResource(R.drawable.tanchuangbeijing);//设置对话框的背景
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.dialog_prompt, null);

        TextView tvDesc = (TextView) view.findViewById(R.id.tv_desc);
        if (!TextUtils.isEmpty(text)) {
            tvDesc.setText(text);
        }
        Button btnPositive = (Button) view.findViewById(R.id.btn_positive);
        Button btnNegative = (Button) view.findViewById(R.id.btn_negative);
        btnPositive.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (positiveListener != null) {
                    positiveListener.onClick(v);
                    dialog.dismiss();
                }
            }
        });
        btnNegative.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
            }
        });

              //默认显示在窗口的正中间，但是可以通过x改变水平位置，y改变垂直位置，x为正向右偏移，反之向左偏移，y为正向下偏移，反之向上；

        WindowManager.LayoutParams attributes = window.getAttributes();

        attributes.x = x;
        attributes.y = y;
        window.setAttributes(attributes);
        window.setContentView(view);