1、bitmap保存到SQLite 中 數據格式:
- db.execSQL("Create table express ( _id INTEGER PRIMARY KEY AUTOINCREMENT,express_no varchar(100),express_name TEXT,express_img BLOB );");
2、bitmap 變為 Blob
- ContentValues values = new ContentValues();
- Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.erweima);
- final ByteArrayOutputStream os = new ByteArrayOutputStream();
- bmp.compress(Bitmap.CompressFormat.PNG, 100, os);
- values.put("express_img", os.toByteArray());
- values.put("express_name","zf");
- values.put("express_no","zf");
- getContentResolver().insert("express", values);
3、從SQLite中讀取Bitmap
- byte[] in=cur.getBlob(cur.getColumnIndex("express_img"));
- bmpout=BitmapFactory.decodeByteArray(in,0,in.length);
顯示在ImageView上
- ImageView imageView = (ImageView) view.findViewById(R.id.img);
- ByteArrayInputStream stream = new ByteArrayInputStream(cur.getBlob(cur.getColumnIndex("express_img")));
- imageView.setImageDrawable(Drawable.createFromStream(stream, "img"));
總結:
inputStream: 作為數據緩存,數據寫如何供別的對象讀取,其方法為read();
outputStream:作為數據緩存,將來向別的對象寫內容!其方法write();
- byte[] in=cur.getBlob(cur.getColumnIndex(MyUser.User.BITMAP_VALUES));
//這樣也可以對數據進行初始化,byte是基本類型,不需要之前進行長度定義。