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对话框

确定取消对话框

• 创建对话框构建器对象，类似工厂模式

        AlertDialog.Builder builder = new Builder(this);

• 设置标题和正文

        builder.setTitle("警告");
        builder.setMessage("若练此功，必先自宫");

• 设置确定和取消按钮

        builder.setPositiveButton("现在自宫", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "恭喜你自宫成功，现在程序退出", 0).show();
            }
        });

        builder.setNegativeButton("下次再说", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "若不自宫，一定不成功", 0).show();
            }
        });

• 使用构建器创建出对话框对象

        AlertDialog ad = builder.create();
        ad.show();

单选对话框

        AlertDialog.Builder builder = new Builder(this);
        builder.setTitle("选择你的性别");

• 定义单选选项

        final String[] items = new String[]{
                "男", "女", "其他"
        };
        //-1表示没有默认选择
        //点击侦听的导包要注意别导错
        builder.setSingleChoiceItems(items, -1, new OnClickListener() {

            //which表示点击的是哪一个选项
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "您选择了" + items[which], 0).show();
                //对话框消失
                dialog.dismiss();
            }
        });

        builder.show();

多选对话框

        AlertDialog.Builder builder = new Builder(this);
        builder.setTitle("请选择你认为最帅的人");

• 定义多选的选项，因为可以多选，所以需要一个boolean数组来记录哪些选项被选了

        final String[] items = new String[]{
                "赵帅哥",
                "赵师哥",
                "赵老师",
                "侃哥"
        };
        //true表示对应位置的选项被选了
        final boolean[] checkedItems = new boolean[]{
                true,
                false,
                false,
                false,
        };
        builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {

            //点击某个选项，如果该选项之前没被选择，那么此时isChecked的值为true
            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                checkedItems[which] = isChecked;
            }
        });

        builder.setPositiveButton("确定", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                StringBuffer sb = new StringBuffer();
                for(int i = 0;i < items.length; i++){
                    sb.append(checkedItems[i] ? items[i] + " " : "");
                }
                Toast.makeText(MainActivity.this, sb.toString(), 0).show();
            }
        });
        builder.show();