5.30

学习政策查询app作业开发

1. 创建一个政策类 Policy，包括政策的标题、内容等属性。

public class Policy {
    private String title;
    private String content;
    
    // 构造函数、getter和setter方法
}

2. 在 MainActivity.java 中编写搜索功能的逻辑，包括从本地数据库或网络获取政策数据，并展示搜索结果。

public class MainActivity extends AppCompatActivity {
    private List<Policy> policyList;
    private RecyclerView recyclerView;
    private PolicyAdapter policyAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 初始化RecyclerView和Adapter
        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        policyAdapter = new PolicyAdapter();

        // 设置搜索按钮点击事件
        ImageButton searchButton = findViewById(R.id.searchButton);
        searchButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String keyword = ((EditText) findViewById(R.id.searchEditText)).getText().toString();
                List<Policy> searchResult = searchPolicyByKeyword(keyword);

                policyAdapter.setData(searchResult);
                recyclerView.setAdapter(policyAdapter);
            }
        });
    }

    private List<Policy> searchPolicyByKeyword(String keyword) {
        List<Policy> searchResult = new ArrayList<>();
        // 从政策数据中搜索包含关键词的政策
        for (Policy policy : policyList) {
            if (policy.getTitle().toLowerCase().contains(keyword.toLowerCase()) || policy.getContent().toLowerCase().contains(keyword.toLowerCase())) {
                searchResult.add(policy);
            }
        }
        return searchResult;
    }
}

3. 创建政策列表项的适配器 PolicyAdapter。

public class PolicyAdapter extends RecyclerView.Adapter<PolicyAdapter.PolicyViewHolder> {
    private List<Policy> policyList;

    public void setData(List<Policy> data) {
        policyList = data;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public PolicyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // 创建ViewHolder
    }

    @Override
    public void onBindViewHolder(@NonNull PolicyViewHolder holder, int position) {
        // 绑定数据到ViewHolder
    }

    @Override
    public int getItemCount() {
        return policyList == null ? 0 : policyList.size();
    }

    public static class PolicyViewHolder extends RecyclerView.ViewHolder {
        // ViewHolder中的View实例
    }
}