public Drawable icon; \\ Some value in this field
我正在SQLite Manager中创建一个数据库。我想将icon
存储到数据库中。另一个字段显示正确,但是当我使用数据类型为icon
的{{1}}字段时,它不会显示。
BLOB
答案 0 :(得分:14)
您可以将图像转换为字节数组,并将该bytearray存储在数据库中的blob中。您可以将数据作为字节数组从数据库中检索回来。
ImageView iv = (ImageView) findViewById(R.id.splashImageView);
Drawable d = iv.getBackground();
BitmapDrawable bitDw = ((BitmapDrawable) d);
Bitmap bitmap = bitDw.getBitmap();
System.out.println(".....d....."+d);
System.out.println("...bitDw...."+bitDw);
System.out.println("....bitmap...."+bitmap);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] imageInByte = stream.toByteArray();
ContentValues cv = new ContentValues();
cv.put(CHUNK, buffer); //CHUNK blob type field of your table
long rawId = database.insert(TABLE, null, cv); //TABLE table name
public static Bitmap convertByteArrayToBitmap(
byte[] byteArrayToBeCOnvertedIntoBitMap)
{
bitMapImage = BitmapFactory.decodeByteArray(
byteArrayToBeCOnvertedIntoBitMap, 0,
byteArrayToBeCOnvertedIntoBitMap.length);
return bitMapImage;
}
答案 1 :(得分:0)
我在上面的答案中做了一些改变来获取字节数组imageview
ImageView iv =(ImageView)findViewById(R.id.splashImageView);
iv.setDrawingCacheEnabled(true);
Bitmap bitmap = iv.getDrawingCache();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] bitmapdata = stream.toByteArray();
答案 2 :(得分:0)
如果要将多个图像保存到数据库,则可以创建自己的方法,如下所示: //从drawable中检索图像到int数组:
int[] IMAGES = { R.drawable.yourimage1, R.drawable.yourimage2, R.drawable.yourimage3,
R.drawable.yourimage4, R.drawable.yourimage5 };
//create method to convert drawable images(which are in int) to byte[] as below:
public byte[] convertToByteArray(int image){
Resources resources = getResources();
Drawable drawable = resources.getDrawable(image);
Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress( Bitmap.CompressFormat.PNG, 100, stream);
byte[] bitmapData = stream.toByteArray();
return bitmapData;
}
现在调用此方法如下: byte [] image = convertToByteArray(IMAGES [position]); // dbAdapter.insertValues(图像);