SQLite存取图片

//向数据库中插入数据信息 public long inserUser(User user) { // 获得sqliteDatebase进行数据库操作 db = dbHelper.getWritableDatabase(); // 参数绑定对象 values = new ContentValues(); values.put(DBInfo.Table.USER_ID,user.getUser_id()); values.put(DBInfo.Table.USER_NAME,user.getUser_name()); values.put(DBInfo.Table.TOKEN,user.getToken()); values.put(DBInfo.Table.TOKEN_SECRET,user.getToken_secret()); values.put(DBInfo.Table.DESCRIPTION,user.getDescription()); //图片向sqlite数据库中进行插入的时候进行的转换操作 userHead 变量类型 Drawable // 将图片类型的数据进行存储的时候，需要进行转换才能存储到BLOB类型中 ByteArrayOutputStream os = new ByteArrayOutputStream(); // 为了实现数据存储，需要将数据类型进行转换 BitmapDrawable newHead = (BitmapDrawable) user.getUser_head(); // 将数据进行压缩成PNG编码数据，存储质量100% newHead.getBitmap().compress(CompressFormat.PNG,100,os); // 存储图片类型数据 values.put(DBInfo.Table.USER_HEAD,os.toByteArray()); // 进行插入操作，返回行号 long rowId = db.insert(DBInfo.Table.USER_TABLE,DBInfo.Table.USER_NAME,values); // 释放资源 db.close(); return rowId; } //从数据库中读取所有用户信息 public List<User> findAllUsers() { db = dbHelper.getReadableDatabase(); List<User> userList = null; User user = null; Cursor cursor = db.query(DBInfo.Table.USER_TABLE,columns,null,null); if (cursor != null && cursor.getCount() > 0) { userList = new ArrayList<User>(cursor.getCount()); while (cursor.movetoNext()) { user = new User(); user.setId(cursor.getLong(cursor .getColumnIndex(DBInfo.Table._ID))); user.setUser_id(cursor.getString(cursor .getColumnIndex(DBInfo.Table.USER_ID))); user.setUser_name(cursor.getString(cursor .getColumnIndex(DBInfo.Table.USER_NAME))); user.setToken(cursor.getString(cursor .getColumnIndex(DBInfo.Table.TOKEN))); user.setToken_secret(cursor.getString(cursor .getColumnIndex(DBInfo.Table.TOKEN_SECRET))); user.setDescription(cursor.getString(cursor .getColumnIndex(DBInfo.Table.DESCRIPTION))); //从数据库中对数据进行读取 byte[] byteHead = cursor.getBlob(cursor .getColumnIndex(DBInfo.Table.USER_HEAD)); ByteArrayInputStream is = new ByteArrayInputStream(byteHead); Drawable userHead = Drawable.createFromStream(is,"image"); user.setUser_head(userHead); userList.add(user); } } cursor.close(); db.close(); return userList; } } //程序中获取ImageView对象 private ImageView user_head;

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