Android 使用回调.activity调用fragment中的数据

[code]    /**
     * 在fragment中定义接口,在activity中实现回调
     */

    public interface TodoCallback {
        public void todo(String str);
    }

    TodoCallback callback;
    private Button tel_regist_getyzm;
    private TimeCount time;

    public void setTodoCallback(TodoCallback callback) {
        this.callback = callback;
    }

[code]/**
* 定义回调 activity在实现回调时,取fragment中的phone_num
 */
    callback.todo(phone_num);

[code]    fragment1.setTodoCallback(callback);//监听回调,让fragment去注册,完事告诉我

[code]private TodoCallback callback = new TodoCallback() {
        @Override
        public void todo(String phone_num) {

            Bundle b = new Bundle();
            b.putString("tel", phone_num);
            b.putString("key", "regist");// 标注为注册
            jumpToClazz(InputPwdActivity.class, b);

        }
    };