Android选择对话框

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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[]{            "伟哥",            "李哥",            "李老师",            "炮哥"    };    //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();

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