Android使用RecyclerView实现投票系统
本文实例为大家分享了Android投票系统的具体代码,供大家参考,具体内容如下
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一、创建一个fragment_vote_list.xml用来显示投票的主页面
(1)标题栏使用Toolbar
(2)投票区域可以滑动,使用RecyclerView实现
<?xml version="1.0" encoding="utf-8"?>
注:界面字体大小以及控件宽度自行调整即可,使用RecyclerView首先需要在项目的build.gradle中添加相应的依赖库才行。添加:implementation ‘com.android.support:recyclerview-v7:24.2.1'
界面效果:
二、创建一个item_vote.xml用来显示投票的具体内容
(1)主布局使用LinearLayout实现,里面添加一个TextView用来显示投票的问题,使用CheckBox作为投票的多选框。
(2)将当前的Item加载到投票的主页面中
<?xml version="1.0" encoding="utf-8"?>
界面效果:
三、创建一个投票信息实体类作为适配器的适配类型,新建VoteInfo.java类。
public class VoteInfo { private String questionItem; private String[] answerItems; public VoteInfo(String questionItem,String[] answerItems){ this.questionItem=questionItem; this.answerItems=answerItems; } public String getQuestionItem(){ return questionItem; } public String[] getAnswerItems(){ return answerItems; } }
四、接下来需要为RecyclerView准备一个适配器,新建VoteInfoAdapter.java,让这个适配器继承自RecyclerView.Adapter,并将泛型指定为VoteInfoAdapter.ViewHolder。其中,ViewHolder是我们在VoteInfoAdapter中定义的一个内部类。
public class VoteInfoAdapter extends RecyclerView.Adapter{ private List mVoteInfoList; @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.item_vote,parent,false); ViewHolder holder=new ViewHolder(view); return holder; } @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { VoteInfo voteInfo=mVoteInfoList.get(position); holder.questionItem.setText(voteInfo.getQuestionItem()); holder.answerItem_1.setText(voteInfo.getAnswerItems()[0]); holder.answerItem_2.setText(voteInfo.getAnswerItems()[1]); holder.answerItem_3.setText(voteInfo.getAnswerItems()[2]); } @Override public int getItemCount() { return mVoteInfoList.size(); } static class ViewHolder extends RecyclerView.ViewHolder{ TextView questionItem; CheckBox answerItem_1; CheckBox answerItem_2; CheckBox answerItem_3; public ViewHolder(View itemView) { super(itemView); questionItem=(TextView)itemView.findViewById(R.id.item_vote_question_tv); answerItem_1=(CheckBox)itemView.findViewById(R.id.item_vote_answer1_cb); answerItem_2=(CheckBox)itemView.findViewById(R.id.item_vote_answer2_cb); answerItem_3=(CheckBox)itemView.findViewById(R.id.item_vote_answer3_cb); } } public VoteInfoAdapter(List voteInfoList){ mVoteInfoList=voteInfoList; } }
五、适配器已经准备完毕,开始使用RecyclerView,新建一个ShowVoteAdapter.java类。
public class ShowVoteActivity extends BaseActivity{ @BindView(R.id.vote_list_recycleview) RecyclerView recyclerView; private ListvoteInfoList=new ArrayList (); @Override protected void onCreate(Bundle saveInstanceState) { super.onCreate(saveInstanceState); ScreenUtils.setContentViewWithOrientation(this, ScreenUtils.isPhone() ? R.layout.fragment_vote_list : R.layout.fragment_vote_list); initVoteInfo(); LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this); recyclerView.setLayoutManager(linearLayoutManager); VoteInfoAdapter voteInfoAdapter=new VoteInfoAdapter(voteInfoList); recyclerView.setAdapter(voteInfoAdapter); } private void initVoteInfo(){ VoteInfo vote1=new VoteInfo("1.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote1); VoteInfo vote2=new VoteInfo("2.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote2); VoteInfo vote3=new VoteInfo("3.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote3); VoteInfo vote4=new VoteInfo("4.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote4); VoteInfo vote5=new VoteInfo("5.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote5); VoteInfo vote6=new VoteInfo("6.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote6); VoteInfo vote7=new VoteInfo("7.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote7); VoteInfo vote8=new VoteInfo("8.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote8); VoteInfo vote9=new VoteInfo("9.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote9); VoteInfo vote10=new VoteInfo("10.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote10); VoteInfo vote11=new VoteInfo("11.请问以下哪个答案最佳?",new String[]{"AAAAAA","BBBBBB","CCCCCC"}); voteInfoList.add(vote11); } }
六、需要AndroidManifest.xml中注册ShowVoteActivity,才能够正常启动。
七、最终界面效果图
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
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