Android简单实现搜索功能显示清除历史搜索记录

2024-06-30 00:36| 来源: 网络整理| 查看: 265

本文主要为大家分享了Android实现搜索功能，并且可以实时显示搜索的历史记录，根据输入的内容去模糊查询，供大家参考，界面图如下。

本案例实现起来也非常的简单，所以可以直接拿来嵌入项目中使用，主要涉及到的知识点：

1、数据库的增删改查操作

2、监听软键盘回车按钮设置为搜索按钮

3、使用TextWatcher( )进行实时筛选

4、已搜索的关键字再次搜索不会重复添加到数据库

既然是要保存搜索记录，首先得建立数据库表：

/** * 搜索记录帮助类 * Created by 05 on 2016/7/27. */ public class RecordSQLiteOpenHelper extends SQLiteOpenHelper { private final static String DB_NAME = "temp.db"; private final static int DB_VERSION = 1; public RecordSQLiteOpenHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } @Override public void onCreate(SQLiteDatabase db) { String sqlStr = "CREATE TABLE IF NOT EXISTS records (_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT);"; db.execSQL(sqlStr); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } }

数据库操作类，增删改查都在里面：

/** * 搜索记录操作类 * Created by 05 on 2016/7/27. */ public class RecordsDao { RecordSQLiteOpenHelper recordHelper; SQLiteDatabase recordsDb; public RecordsDao(Context context) { recordHelper = new RecordSQLiteOpenHelper(context); } //添加搜索记录 public void addRecords(String record) { if (!isHasRecord(record)) { recordsDb = recordHelper.getReadableDatabase(); ContentValues values = new ContentValues(); values.put("name", record); //添加 recordsDb.insert("records", null, values); //关闭 recordsDb.close(); } } //判断是否含有该搜索记录 public boolean isHasRecord(String record) { boolean isHasRecord = false; recordsDb = recordHelper.getReadableDatabase(); Cursor cursor = recordsDb.query("records", null, null, null, null, null, null); while (cursor.moveToNext()) { if (record.equals(cursor.getString(cursor.getColumnIndexOrThrow("name")))) { isHasRecord = true; } } //关闭数据库 recordsDb.close(); cursor.close(); return isHasRecord; } //获取全部搜索记录 public List getRecordsList() { List recordsList = new ArrayList(); recordsDb = recordHelper.getReadableDatabase(); Cursor cursor = recordsDb.query("records", null, null, null, null, null, null); while (cursor.moveToNext()) { String name = cursor.getString(cursor.getColumnIndexOrThrow("name")); recordsList.add(name); } //关闭数据库 recordsDb.close(); cursor.close(); return recordsList; } //模糊查询 public List querySimlarRecord(String record){ String queryStr = "select * from records where name like '%" + record + "%' order by name "; List similarRecords = new ArrayList(); Cursor cursor= recordHelper.getReadableDatabase().rawQuery(queryStr,null); while (cursor.moveToNext()) { String name = cursor.getString(cursor.getColumnIndexOrThrow("name")); similarRecords.add(name); } cursor.close(); return similarRecords; } //清空搜索记录 public void deleteAllRecords() { recordsDb = recordHelper.getWritableDatabase(); recordsDb.execSQL("delete from records"); recordsDb.close(); } }

数据库类已经封装好了，接下来就是界面代码：

因为是将搜索的历史信息做成显示隐藏的效果，所以单独写了一个历史信息的layout:

既然用到了listview来显示历史搜索信息，就需要写listview的item：

用到了listview，当然还需要适配器，因为目前只有文本可以使用SimpleAdapter，为了以后能添加别的，我还是自定义了一个Adapter：

/** * Created by 05 on 2016/7/27. */ public class SearchRecordsAdapter extends BaseAdapter { private Context context; private List searchRecordsList; private LayoutInflater inflater; public SearchRecordsAdapter(Context context, List searchRecordsList) { this.context = context; this.searchRecordsList = searchRecordsList; inflater = LayoutInflater.from(context); } @Override public int getCount() { return searchRecordsList.size() == 0 ? 0 : searchRecordsList.size(); } @Override public Object getItem(int position) { return searchRecordsList.size() == 0 ? null : searchRecordsList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder viewHolder; if(null == convertView){ viewHolder = new ViewHolder(); convertView = inflater.inflate(R.layout.saerch_records_list_item,null); viewHolder.recordTv = (TextView) convertView.findViewById(R.id.search_content_tv); convertView.setTag(viewHolder); }else{ viewHolder = (ViewHolder) convertView.getTag(); } String content = searchRecordsList.get(position); viewHolder.recordTv.setText(content); return convertView; } private class ViewHolder { TextView recordTv; } }

最后就是界面代码了：

/** * 搜索界面 * Created by 05 on 2016/7/26. */ public class SearchContentActivity extends BaseActivity implements View.OnClickListener { private EditText searchContentEt; private SearchRecordsAdapter recordsAdapter; private View recordsHistoryView; private ListView recordsListLv; private TextView clearAllRecordsTv; private LinearLayout searchRecordsLl; private List searchRecordsList; private List tempList; private RecordsDao recordsDao; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); BaseSetContentView(R.layout.activity_search_content); initView(); initData(); bindAdapter(); initListener(); } private void initView() { setHideHeader(); initRecordsView(); searchRecordsLl = (LinearLayout) findViewById(R.id.search_content_show_ll); searchContentEt = (EditText) findViewById(R.id.input_search_content_et); //添加搜索view searchRecordsLl.addView(recordsHistoryView); } //初始化搜索历史记录View private void initRecordsView() { recordsHistoryView = LayoutInflater.from(this).inflate(R.layout.search_records_list_layout, null); //显示历史记录lv recordsListLv = (ListView) recordsHistoryView.findViewById(R.id.search_records_lv); //清除搜索历史记录 clearAllRecordsTv = (TextView) recordsHistoryView.findViewById(R.id.clear_all_records_tv); } private void initData() { recordsDao = new RecordsDao(this); searchRecordsList = new ArrayList(); tempList = new ArrayList(); tempList.addAll(recordsDao.getRecordsList()); reversedList(); //第一次进入判断数据库中是否有历史记录，没有则不显示 checkRecordsSize(); } private void bindAdapter() { recordsAdapter = new SearchRecordsAdapter(this, searchRecordsList); recordsListLv.setAdapter(recordsAdapter); } private void initListener() { clearAllRecordsTv.setOnClickListener(this); searchContentEt.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { if (actionId == EditorInfo.IME_ACTION_SEARCH) { if (searchContentEt.getText().toString().length() > 0) { String record = searchContentEt.getText().toString(); //判断数据库中是否存在该记录 if (!recordsDao.isHasRecord(record)) { tempList.add(record); } //将搜索记录保存至数据库中 recordsDao.addRecords(record); reversedList(); checkRecordsSize(); recordsAdapter.notifyDataSetChanged(); //根据关键词去搜索 } else { ToastUtils.showToast(SearchContentActivity.this, "搜索内容不能为空"); } } return false; } }); //根据输入的信息去模糊搜索 searchContentEt.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { String tempName = searchContentEt.getText().toString(); tempList.clear(); tempList.addAll(recordsDao.querySimlarRecord(tempName)); reversedList(); checkRecordsSize(); recordsAdapter.notifyDataSetChanged(); } }); //历史记录点击事件 recordsListLv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView parent, View view, int position, long id) { //将获取到的字符串传到搜索结果界面 } }); } //当没有匹配的搜索数据的时候不显示历史记录栏 private void checkRecordsSize(){ if(searchRecordsList.size() == 0){ searchRecordsLl.setVisibility(View.GONE); }else{ searchRecordsLl.setVisibility(View.VISIBLE); } } @Override public void onClick(View v) { switch (v.getId()){ //清空所有历史数据 case R.id.clear_all_records_tv: tempList.clear(); reversedList(); recordsDao.deleteAllRecords(); recordsAdapter.notifyDataSetChanged(); searchRecordsLl.setVisibility(View.GONE); break; } } //颠倒list顺序，用户输入的信息会从上依次往下显示 private void reversedList(){ searchRecordsList.clear(); for(int i = tempList.size() - 1 ; i >= 0 ; i --){ searchRecordsList.add(tempList.get(i)); } } }

以上就是实现搜索记录存储，搜索信息模糊查询的全部代码了，供大家参考，当然也给自己提供一个整理思路的锻炼。O(∩_∩)O~

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Android简单实现搜索功能 显示清除历史搜索记录

Android简单实现搜索功能显示清除历史搜索记录