Android 日记应用 - 搜索 SQLite 数据库并在 ListView 中显示结果
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【中文标题】Android 日记应用 - 搜索 SQLite 数据库并在 ListView 中显示结果【英文标题】：Android diary app - Search SQLite database and display results in ListView 【发布时间】：2021-10-05 07:00:47 【问题描述】：我在 android 中有一个日记应用程序，我希望能够根据用户在 EditText 字段中键入的内容在 SQLite 数据库中搜索条目。问题是我必须使用旧版本，这使得使用 RecyclerView 变得困难（我认为）。我的设置如下：
一个 SQLite 数据库
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class SecondDataBaseHelper extends SQLiteOpenHelper
private static SecondDataBaseHelper secondDataBaseHelper;
SQLiteDatabase db = this.getWritableDatabase();
public final static String DATABASE_NM ="RECORD_OF_USER";
public final static String TABLE_NM ="DATA_OF_USER";
public final static String COL_1 = "ID";
public final static String COL_2 = "SUBJECT";
public final static String COL_3 = "ENTRY";
public final static String COL_4 = "DATE";
public final static String COL_5 = "LATITUDE";
public final static String COL_6 = "LONGITUDE";
public SecondDataBaseHelper(Context context)
super(context, DATABASE_NM, null, 1);
public static SecondDataBaseHelper databaseInstance(Context context)
if (secondDataBaseHelper == null)
secondDataBaseHelper = new SecondDataBaseHelper(context);
return secondDataBaseHelper;
@Override
public void onCreate(SQLiteDatabase db)
db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_NM +" (ID TEXT, SUBJECT TEXT, ENTRY TEXT, DATE TEXT, LATITUDE TEXT, LONGITUDE TEXT)");
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
public void addEntryToDatabase(Diary entry)
ContentValues contentValues = new ContentValues();
contentValues.put(COL_1, entry.getId());
contentValues.put(COL_2, entry.getSubject());
contentValues.put(COL_3, entry.getContent());
contentValues.put(COL_4, entry.getDate());
contentValues.put(COL_5, entry.getLatitude());
contentValues.put(COL_6, entry.getLongitude());
db.insert(TABLE_NM, null, contentValues);
public void populateDiaryListArray()
SQLiteDatabase sqLiteDatabase = this.getReadableDatabase();
try (Cursor result = sqLiteDatabase.rawQuery("SELECT * FROM " + TABLE_NM, null))
if (result.getCount() != 0)
while (result.moveToNext())
String id = result.getString(1);
String subject = result.getString(2);
String content = result.getString(3);
String date = result.getString(4);
String latitude = result.getString(5);
String longitude = result.getString(6);
Diary diary = new Diary(id, subject, content, date, latitude, longitude);
Diary.diaryArrayList.add(diary);
public void updateDiaryInDB(Diary entry)
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_1, entry.getId());
contentValues.put(COL_2, entry.getSubject());
contentValues.put(COL_3, entry.getContent());
contentValues.put(COL_4, entry.getDate());
contentValues.put(COL_5, entry.getLatitude());
contentValues.put(COL_6, entry.getLongitude());
sqLiteDatabase.update(TABLE_NM, contentValues, COL_1 + " ?= ", new String[]String.valueOf(entry.getId()));
public void deleteEntry(String id)
db.delete(TABLE_NM, COL_1 + "=" + id, null);
./日记适配器
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import org.w3c.dom.Text;
import java.util.List;
public class DiaryAdapter extends ArrayAdapter<Diary>
public DiaryAdapter(Context context, List<Diary> entries)
super(context, 0, entries);
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent)
Diary diary = getItem(position);
if (convertView == null)
convertView = LayoutInflater.from(getContext()).inflate(R.layout.note_cell, parent, false);
TextView entryID = convertView.findViewById(R.id.entryID);
TextView entrySubject = convertView.findViewById(R.id.entrySubject);
entryID.setText(diary.getId());
entrySubject.setText(diary.getSubject());
return convertView;
日记类本身
import java.util.ArrayList;
import java.util.Date;
public class Diary
private String id;
private String subject;
private String content;
private String date;
private String latitude;
private String longitude;
public static ArrayList<Diary> diaryArrayList = new ArrayList<>();
public static String DIARY_EDIT_EXTRA = "diaryEdit";
public Diary(String id, String subject, String content, String date, String latitude, String longitude)
this.id = id;
this.subject = subject;
this.content = content;
this.date = date;
this.latitude = latitude;
this.longitude = longitude;
public static Diary getDiaryForID(int passedDiaryID)
for (Diary diary : diaryArrayList)
if (Integer.parseInt((diary.getId())) == passedDiaryID)
return diary;
return null;
public String getId()
return id;
public void setId(String id)
this.id = id;
public String getSubject()
return subject;
public void setSubject(String subject)
this.subject = subject;
public String getContent()
return content;
public void setContent(String content)
this.content = content;
public String getDate()
return date;
public void setDate(String date)
this.date = date;
public String getLatitude()
return latitude;
public void setLatitude(String latitude)
this.latitude = latitude;
public String getLongitude()
return longitude;
public void setLongitude(String longitude)
this.longitude = longitude;
还有应用主页面本身，./SearchEntries
import java.util.ArrayList;
public class SearchEntries extends AppCompatActivity
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_entries);
我的XML页面设置如下
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
android:orientation="vertical"
tools:context=".SearchEntries">
<androidx.appcompat.widget.Toolbar
android:layout_
android:layout_
android:minHeight="?actionBarSize"
android:theme="?actionBarTheme"
android:background="@color/darkGray">
<TextView
android:layout_
android:layout_
android:text="Search"
android:textSize="35sp"
android:paddingRight="25dp"
android:textColor="@color/white"
android:textStyle="bold"
android:layout_gravity="center"/>
</androidx.appcompat.widget.Toolbar>
<EditText
android:id="@+id/searchTextField"
android:layout_
android:layout_
android:layout_gravity="center"
android:layout_marginTop="30dp"
android:hint="Enter text here"
android:maxLines="1"
android:textSize="25sp" />
<ListView
android:id="@+id/diarySearchResults"
android:layout_
android:layout_
android:layout_marginTop="8dp"
android:dividerHeight="3dp"
android:divider="@color/darkGray"/>
</LinearLayout>
基本上，我想在 XML 文件的 searchTextField 中输入文本，并将其显示在 ./diarySearchResults ListView 字段中，其中每个条目仅由适配器的 ID/主题组合组成。
【问题讨论】：
【参考方案1】：如果你想从 SQLite 中搜索到的关键字中获取数据列表，那么这里是简单的查询。
我已经用你的模型类和 DatabaseHelper 制作了一个方法来简化它。 只需在其中传递所需的关键字即可完成工作。
private void searchDiaryData(String diaryId, String diarySubject)
List<Diary> searchResults = new ArrayList<>();
Cursor cursor = database.rawQuery(" SELECT * FROM " + TABLE_NM +
" WHERE " + SecondDataBaseHelper.COL_1 + " LIKE '" + diaryId + "%' OR "
+ SecondDataBaseHelper.COL_2 + " LIKE '" + diarySubject + "%'", null);
if (cursor != null)
if (cursor.moveToFirst())
do
String _id = cursor.getString(cursor.getColumnIndex(SecondDataBaseHelper.COL_1));
String _subject = cursor.getString(cursor.getColumnIndex(SecondDataBaseHelper.COL_2));
String _content = cursor.getString(cursor.getColumnIndex(SecondDataBaseHelper.COL_3));
String _date = cursor.getString(cursor.getColumnIndex(SecondDataBaseHelper.COL_4));
String _latitude = cursor.getString(cursor.getColumnIndex(SecondDataBaseHelper.COL_5));
String _longitude = cursor.getString(cursor.getColumnIndex(SecondDataBaseHelper.COL_6));
Diary diaryModel = new Diary(
_id,
_subject,
_content,
_date,
_latitude,
_longitude
);
searchResults.add(diaryModel);
while (cursor.moveToNext());
diaryAdapter = new DiaryAdapter(this, searchResults);
diarySearchResults.setAdapter(diaryAdapter);
cursor.close();
【讨论】：
哦，太好了！我想我只想按主题搜索，所以在我的 XML 文件中，对于我的 EditText 字段 searchTextField，如果我在该字段中输入“香蕉”之类的术语，我可以将该字符串传递给 searchDiaryData，这将转储到列表视图？ 是的。准确！您可以根据需要更改方法参数。如果您想传递其他字段，则在方法中再创建一个参数并使用OR " + SecondDataBaseHelper.COL_6 + " LIKE '" + keyword + "%' 在查询中传递该参数，它还将检查新关键字。如果您想从具有相同关键字的两列中获取结果，只需将 OR 替换为 AND，它只会在该列包含与关键字相同的字母时为您提供数据。【参考方案2】：
https://www.tutlane.com/tutorial/android/android-sqlite-listview-with-examples
或者
https://simplylearnprogramming.com/android/insert-data-in-to-sqlite-and-display-on-android-listview.html
这是使用列表视图的旧项目。你说你需要在旧设备上运行它。
【讨论】：
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