搜索历史记录的实现-Android
前言
最近一个客户想要实现搜索中搜索历史的功能,其实这个功能听起来很简单,实际上里面有很多逻辑在里面,一开始写的时候脑子蒙蒙的,最后提给客户的时候一堆毛病,这一次来详细梳理一下,也分享一下我的思路
主要逻辑
- 搜索后保存当前内容
- 将最新的搜索记录在最前面
- 搜索历史记录可以点击并执行搜索功能,并将其提到最前面
我里面使用了ObjectBox作为数据存储,因为实际项目用的Java所以没用Room,而且Room好像第一次搜索至少要200ms,不过可以在某个activity随便搜索热启动一下.GreenDao使用有点麻烦,查询条件没有什么太大需求,直接用ObjectBox了,而且使用超级简单
Code
ObjectBox的工具类
public class ObjectBoxUtils {
public static BoxStore init() {
BoxStore boxStore = null;
try {
boxStore = MyApplication.getBoxStore();
if (boxStore == null) {
boxStore = MyObjectBox.builder().androidContext(MyApplication.applicationContext).build();
MyApplication.setBoxStore(boxStore);
}
} catch (Exception e) {
}
return boxStore;
}
public static <T> List<T> getAllData(Class clazz) {
try {
BoxStore boxStore = init();
if (boxStore != null && !boxStore.isClosed()) {
Box<T> box = boxStore.boxFor(clazz);
return box.getAll();
}
} catch (Exception e) {
}
return new ArrayList<>();
}
/**
* 添加数据
*/
public static <T> long addData(T o, Class c) {
try {
BoxStore boxStore = init();
if (boxStore != null && !boxStore.isClosed()) {
return boxStore.boxFor(c).put(o);
}
} catch (Throwable e) {
}
return 0;
}
public static HistoryBean getHistroyBean(String name) {
try {
BoxStore boxStore = init();
if (boxStore != null && !boxStore.isClosed()) {
Box<HistoryBean> box = boxStore.boxFor(HistoryBean.class);
HistoryBean first = box.query().equal(HistoryBean_.name, name).build().findFirst();
return first;
}
} catch (Exception e) {
}
return null;
}
}
其实我在Application就初始化了ObjectBox,但是实际项目中有时候会初始化失败,导致直接空指针,所有每次调用我都会判断一下是否初始化了,没有的话就进行相应操作
Activity
class HistoryActivity : AppCompatActivity() {
private var list: MutableList<HistoryBean>? = null
private var inflate: ActivityHistoryBinding? = null
private var historyAdapter: HistoryAdapter? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
inflate = ActivityHistoryBinding.inflate(layoutInflater)
setContentView(inflate?.root)
list = ObjectBoxUtils.getAllData(HistoryBean::class.java)
list?.sort()
inflate!!.rv.layoutManager = LinearLayoutManager(this, RecyclerView.HORIZONTAL, false)
historyAdapter = HistoryAdapter(this, list)
inflate!!.rv.adapter = historyAdapter
inflate!!.et.setOnEditorActionListener(object : TextView.OnEditorActionListener {
override fun onEditorAction(v: TextView?, actionId: Int, event: KeyEvent?): Boolean {
saveHistory(inflate!!.et.text.toString())
return true
}
})
}
/**
* 保存搜索历史
*
*/
fun saveHistory(keyWord: String) {
//查询本地是否有name为参数中的数据
var histroyBean: HistoryBean? = ObjectBoxUtils.getHistroyBean(keyWord)
val currentTimeMillis = System.currentTimeMillis()
//没有就新创建一个
if (histroyBean == null) {
histroyBean = HistoryBean(currentTimeMillis, keyWord, currentTimeMillis)
} else {
//有的话就更新时间,也就说明了两种情况,第一 重复搜索了,搜索肯定要排重嘛,第二就是我们点击历史记录了,因此更新下时间
histroyBean.setTime(currentTimeMillis)
}
//把新/旧数据保存到本地
ObjectBoxUtils.addData(histroyBean, HistoryBean::class.java)
//每一次操作都从数据库拿取数据,性能消耗很低,就这么一个小模块没必要上纲上线
list?.clear()
list?.addAll(ObjectBoxUtils.getAllData(HistoryBean::class.java))
//实体Bean重写了Comparable,排序一下
list?.sort()
historyAdapter?.notifyDataSetChanged()
}
}
相应注释都在代码里,说实话kotlin用的好难受啊,还是自己语法学的不行,一个小东西卡我好久,导致我Application里面直接删除用Java重写了
实体类
@Entity
public class HistoryBean implements Comparable<HistoryBean> {
@Id(assignable = true)
public long id;
public HistoryBean(long id, String name, long time) {
this.id = id;
this.name = name;
this.time = time;
}
public String name;
public long time;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getTime() {
return time;
}
public void setTime(long time) {
this.time = time;
}
@Override
public int compareTo(HistoryBean o) {
return (int) (o.time-time);
}
}
实体类重写了CompareTo,因为集合的sort实际上也是调用了ComparteTo,我们直接重写相应逻辑就简化业务层很多代码
效果
嗯,效果还不错,继续学习令人脑壳痛的自定义View去了
