一般对话框，单选复选对话框

一般对话框

 //一般对话框
    public void bt_1(View v) {
        //不能直接实例化
        //内部提供构造器
        AlertDialog alertDialog = new AlertDialog.Builder(this)
                .setTitle("确认对话框")
                .setMessage("确定删除？")
                .setPositiveButton("确认", new DialogInterface.OnClickListener() {//正向按钮
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(Text5Activity.this, "执行删除，which=" + which, Toast.LENGTH_SHORT).show();
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {//负面按钮
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(Text5Activity.this, "取消删除，which=" + which, Toast.LENGTH_SHORT).show();
                    }
                })
                .setNeutralButton("中立", new DialogInterface.OnClickListener() {//中立按钮
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(Text5Activity.this, "普通按钮,+which=" + which, Toast.LENGTH_SHORT).show();
                    }
                })
                .setCancelable(false)
                .show();//显示对话框
    }

单选对话框

//单选对话框
    public void bt_2(View v) {
        //String终态，可以让这个常量的生命周期延长到整个实例
        final String[] str = {"男", "女"};
        new AlertDialog.Builder(this)
                .setTitle("单选对话框")
                .setSingleChoiceItems(str, 0, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(Text5Activity.this, "which=" + which + "选中的值是" + str[which], Toast.LENGTH_SHORT).show();

                        //点击关闭对话框
                        //a.dismiss();不能在内部用
                        dialog.dismiss();
                    }
                })
                .setCancelable(false)
                .show();
    }

复选对话框

//复选对话框
    public void bt_3(View v)
    {
        final String []str={"宝马","奔驰","奇瑞","宾利"};
        final boolean[]ch={true,false,false,true};
            new AlertDialog.Builder(this)
                    .setTitle("复选对话框")
                    .setMultiChoiceItems(str, ch, new DialogInterface.OnMultiChoiceClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which, boolean isChecked) {

                            //改变对应项的选中状态
                            ch[which]=isChecked;
                        }
                    })
                    .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                            int i = 0;
                            //获取最终选择状态
                            for (boolean b : ch) {
                                Toast.makeText(Text5Activity.this, str[i] + "选中状态=" + (b ? "选中" : "未选中"), Toast.LENGTH_LONG).show();
                                i++;
                            }
                        }
                    })
                    .setNegativeButton("取消", null)
                    .setCancelable(false)
                    .show();
    }