使用greendao实现搜索历史功能
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之前封装sqlite实现过这功能,不过原生封装使用sql语句,而且greendao功能更强大(对不会sql的我来说更方便写),So...
PRE 依赖greendao
WARMING:
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greendao实体
@Entity
public class SearchHistory {
@Id(autoincrement = true) //自增主键
private Long id;
@Unique // 搜索记录(唯一)
private String name;
}
build gradle | make project(ctrl + F9),自动生成代码
public class MyApp extends Application {
private static MyApp instance;
private static DaoSession daoSession;
public static MyApp getInstance() {
return instance;
}
public static DaoSession getDaoInstant() {
return daoSession;
}
@Override
public void onCreate() {
super.onCreate();
instance = this;
setupDatabase("database.db");
}
/**
* 配置数据库
*/
private void setupDatabase(String name) {
//创建数据库
DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this, name, null);
//获取可写数据库
SQLiteDatabase db = helper.getWritableDatabase();
//获取数据库对象
DaoMaster daoMaster = new DaoMaster(db);
//获取Dao对象管理者
daoSession = daoMaster.newSession();
}
}
public class SearchHistoryDao {
/**
* 添加数据
*
* @param searchHistory
*/
public static void insertHistory(SearchHistory searchHistory) {
MyApp.getDaoInstant().getSearchHistoryDao().insertOrReplace(searchHistory);
}
/**
* 删除数据
*
* @param searchHistory
*/
public static void deleteHistory(SearchHistory searchHistory) {
MyApp.getDaoInstant().getSearchHistoryDao().delete(searchHistory);
}
/**
* 查询全部数据
*
* @return List<SearchHistory>
*/
public static List<SearchHistory> queryAll() {
return MyApp.getDaoInstant().getSearchHistoryDao().loadAll();
}
/**
* 清空数据
*/
public static void clearAll() {
MyApp.getDaoInstant().getSearchHistoryDao().deleteAll();
}
}
详细代码方便以后需要copy
xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#1E8AE8">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_margin="8dp"
android:background="@android:color/white"
android:gravity="center_vertical">
<ImageView
android:id="@+id/btn_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
android:padding="6dp"
android:src="@drawable/ic_arrow_left"
android:tint="@android:color/darker_gray" />
<EditText
android:id="@+id/edit_search"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@android:color/white"
android:hint="搜索知乎内容"
android:imeOptions="actionSearch"
android:inputType="text"
android:maxLines="1" />
<ImageView
android:id="@+id/btn_searchdelete"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:paddingLeft="6dp"
android:paddingRight="6dp"
android:src="@drawable/ic_delete"
android:tint="@android:color/darker_gray"
android:visibility="gone"
tools:visibility="visible" />
</LinearLayout>
</LinearLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:id="@+id/recommandsearch"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:gravity="center_vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="6dp"
android:padding="6dp"
android:src="@drawable/ic_search" />
<TextView
android:id="@+id/tv_recommandsearch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="16dp"
android:gravity="center_vertical"
tools:text="演技能烂到什么程度"
android:textColor="@android:color/black"
android:textSize="16dp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/listview_search_history"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/btn_clearall"
android:layout_width="match_parent"
android:layout_height="48dp"
android:gravity="center"
android:text="清除历史记录"
android:textColor="@android:color/holo_blue_light" />
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp">
<ImageView
android:id="@+id/icon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerVertical="true"
android:paddingRight="6dp"
android:src="@drawable/ic_history"
android:tint="@android:color/darker_gray" />
<TextView
android:id="@+id/tv_recommandsearch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="16dp"
android:layout_marginRight="8dp"
android:layout_toLeftOf="@id/btn_delete"
android:layout_toRightOf="@id/icon"
android:ellipsize="end"
android:gravity="center_vertical"
android:lines="1"
android:text="演技能烂到什么程度"
android:textSize="16dp" />
<ImageView
android:id="@+id/btn_delete"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:paddingLeft="6dp"
android:src="@drawable/ic_delete"
android:tint="@android:color/darker_gray" />
<View
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:layout_alignParentBottom="true"
android:background="@android:color/black" />
</RelativeLayout>
</LinearLayout>
所有ic_的图片为android studio Vector Asset
Adapter
public class SearchAdapter extends RecyclerView.Adapter<SearchAdapter.ViewHolder> {
private Context context;
private List<SearchHistory> list;
public SearchAdapter(Context context, List<SearchHistory> list) {
this.context = context;
this.list = list;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new ViewHolder(LayoutInflater.from(context).inflate(R.layout.item_search_history, parent, false));
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.tvRecommandsearch.setText(list.get(position).getName());
holder.btnDelete.setOnClickListener(view -> deleteListener.OnDelete(position));
holder.itemView.setOnClickListener(view -> itemClickListener.OnItemClick(position));
}
@Override
public int getItemCount() {
return list.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.tv_recommandsearch)
TextView tvRecommandsearch;
@BindView(R.id.btn_delete)
ImageView btnDelete;
ViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
private OnDeleteListener deleteListener;
private OnItemClickListener itemClickListener;
public interface OnDeleteListener {
void OnDelete(int position);
}
public interface OnItemClickListener {
void OnItemClick(int position);
}
public void setOnDeleteListener(OnDeleteListener deleteListener) {
this.deleteListener = deleteListener;
}
public void setOnItemClickListener(OnItemClickListener itemClickListener) {
this.itemClickListener = itemClickListener;
}
}
Activity
public class SearchActivity extends BaseActivity {
@BindView(R.id.btn_back)
ImageView btnBack;
@BindView(R.id.edit_search)
EditText editSearch;
@BindView(R.id.btn_searchdelete)
ImageView btnSearchdelete;
@BindView(R.id.tv_recommandsearch)
TextView tvRecommandsearch;
@BindView(R.id.recommandsearch)
CardView recommandSearch;
@BindView(R.id.listview_search_history)
RecyclerView listview;
@BindView(R.id.btn_clearall)
TextView btnClearall;
private final int DELETEONE = 0X001;
private final int DELETEALL = 0X002;
private SearchAdapter adapter;
private List<SearchHistory> list;
@Override
protected void bindViews() {
setContentView(R.layout.activity_search);
}
@Override
protected void initView() {
}
@Override
protected void initData() {
tvRecommandsearch.setText(getIntent().getStringExtra("recommandsearch"));
recommandSearch.setOnClickListener(view -> {
editSearch.setText(tvRecommandsearch.getText());
insertHistory();
});
list = new ArrayList<>();
adapter = new SearchAdapter(this, list);
listview.setLayoutManager(new LinearLayoutManager(this));
listview.setAdapter(adapter);
adapter.setOnDeleteListener(position -> deleteHistory(DELETEONE, position));
adapter.setOnItemClickListener(position -> {
editSearch.setText(list.get(position).getName());
insertHistory();
});
btnClearall.setOnClickListener(view -> showDeleteDialog());
queryHistory();
}
@Override
protected void initActionBar() {
btnBack.setOnClickListener(view -> finish());
editSearch.setOnEditorActionListener((textView, i, keyEvent) -> {
if (i == EditorInfo.IME_ACTION_SEARCH && !TextUtils.isEmpty(editSearch.getText().toString().trim())) {
ToastUtils.shortToast(editSearch.getText().toString().trim());
insertHistory();
}
return true;
});
editSearch.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
if (charSequence.toString().length() > 0) {
btnSearchdelete.setVisibility(View.VISIBLE);
} else {
btnSearchdelete.setVisibility(View.GONE);
}
}
@Override
public void afterTextChanged(Editable editable) {
}
});
btnSearchdelete.setOnClickListener(view -> editSearch.setText(""));
}
private void showDeleteDialog() {
new AlertDialog.Builder(this)
.setMessage("确认清除所有搜索记录吗?")
.setPositiveButton("确定", (dialogInterface, i) -> deleteHistory(DELETEALL, 1))
.setNegativeButton("取消", null)
.setCancelable(true)
.create().show();
}
private void insertHistory() {
SearchHistory searchHistory = new SearchHistory();
searchHistory.setName(editSearch.getText().toString().trim());
SearchHistoryDao.insertHistory(searchHistory);
queryHistory();
}
private void deleteHistory(int TAG, int position) {
if (TAG == DELETEONE)
SearchHistoryDao.deleteHistory(list.get(position));
else if (TAG == DELETEALL)
SearchHistoryDao.clearAll();
queryHistory();
}
private void queryHistory() {
list.clear();
list.addAll(SearchHistoryDao.queryAll());
Collections.reverse(list);
adapter.notifyDataSetChanged();
}
}
SearchHistoryDao有命名问题的坑,踩踩更健康
