亲爱的我如何使用Android Studio在Android中保存图像并从Sqlite数据库获取图像?
您可以查看本教程以在Android中实现Sqlite。http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/
例如,可以使用Contact代替使用Contact来实现
public class Image{
String imagePath; //it is your absolute image file path
}
您DatabaseHandler
可以像下面这样实现
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "imagedb";
// Contacts table name
private static final String TABLE_IMAGE = "images";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_IMAGE_PATH = "name";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String sqlQuery = "CREATE TABLE " + TABLE_IMAGE + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_IMAGE_PATH + " TEXT)";
db.execSQL(sqlQuery);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_IMAGE);
// Create tables again
onCreate(db);
}
// Adding new image
public void addImage(Image image) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_IMAGE_PATH, image.imagePath); // Image path
// Inserting Row
db.insert(TABLE_IMAGE, null, values);
db.close(); // Closing database connection
}
// Getting single image
public Image getImage(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_IMAGE, new String[] { KEY_ID,
KEY_IMAGE_PATH}, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Image image = new Image(Integer.parseInt(cursor.getString(0)),
cursor.getString(1));
// return image
return image;
}
}
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