下面是一个基于Android的搜索查询分页的代码示例:
public class MainActivity extends AppCompatActivity {
private EditText searchEditText;
private Button searchButton;
private ListView resultsListView;
private List searchResults;
private ArrayAdapter adapter;
private int currentPage = 1;
private int totalPages = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
searchEditText = findViewById(R.id.searchEditText);
searchButton = findViewById(R.id.searchButton);
resultsListView = findViewById(R.id.resultsListView);
searchResults = new ArrayList<>();
adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, searchResults);
resultsListView.setAdapter(adapter);
searchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
performSearch();
}
});
resultsListView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
if (resultsListView.getLastVisiblePosition() == resultsListView.getAdapter().getCount() - 1) {
if (currentPage < totalPages) {
currentPage++;
performSearch();
}
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
// Not used
}
});
}
private void performSearch() {
String searchQuery = searchEditText.getText().toString();
// Code to perform actual search query using the searchQuery and currentPage variables
// Simulating search results
List newResults = getSearchResults(searchQuery, currentPage);
searchResults.addAll(newResults);
adapter.notifyDataSetChanged();
// Simulating total number of pages
if (currentPage == 1) {
totalPages = 5;
}
}
private List getSearchResults(String searchQuery, int page) {
// Code to retrieve search results from server or database based on searchQuery and page variables
// Return a list of search results for the given page
List results = new ArrayList<>();
for (int i = 1; i <= 10; i++) {
results.add("Result " + i);
}
return results;
}
}
在上面的代码示例中,performSearch()
方法用于执行搜索查询操作。这个方法首先获取搜索查询的关键字,然后调用相应的搜索查询方法(此处仅作模拟,实际应用中可能是与服务器或数据库交互的代码)。返回的搜索结果被添加到 searchResults
列表中,并通过调用 adapter.notifyDataSetChanged()
更新列表显示。currentPage
变量用于跟踪当前搜索结果的页数,totalPages
变量用于存储总页数,以便在滚动到最后一页时检查是否还有更多结果可加载。
在 resultsListView.setOnScrollListener()
中设置了滚动监听器,当滚动到列表的最后一个可见位置时,如果当前页小于总页数,则递增 currentPage
变量并执行搜索查询,以加载更多结果。
请注意,上述代码示例中的搜索查询和分页逻辑仅作为示例,实际应用中可能需要使用其他库或框架来实现更复杂的搜索查询和分页功能。