//1.创建数据库 public class DBService extends SQLiteOpenHelper { private final static int VERSION = 1; private final static String DATABASE_NAME = "uniteqlauncher.db"; public DBService(Context context) {     this(context, DATABASE_NAME, null, VERSION); } public DBService(Context context, String name, CursorFactory factory,         int version) {     super(context, name, factory, version); } @Override public void onCreate(SQLiteDatabase db) {     String sql = "CREATE TABLE [launcher]("         + "[_id] INTEGER PRIMARY KEY AUTOINCREMENT,"         + "[photo] BINARY)"; //保存为binary格式     db.execSQL(sql); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {     if(newVersion > oldVersion){         db.execSQL("DROP TABLE IF EXISTS[launcher]");     } else {         return;     }     onCreate(db); } } //保存图片到数据库 public void savePhoto(Drawable appIcon, Context mContext){ LayoutInflater mInflater = (LayoutInflater) mContext .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View v = inflater.inflate(R.layout.app_view, null); ImageView iv = (ImageView) v.findViewById(R.id.appicon); iv.setImageDrawable(appIcon); String INSERT_SQL = "INSERT INTO launcher(photo) values(?)"; SQLiteDatabase db = mDBService.getWritableDatabase(); // 得到数据库 try { ByteArrayOutputStream baos = new ByteArrayOutputStream(); ((BitmapDrawable) iv.getDrawable()).getBitmap().compress( CompressFormat.PNG, 100, baos);//压缩为PNG格式,100表示跟原图大小一样 Object[] args = new Object[] {baos.toByteArray() }; db.execSQL(INSERT_SQL, args); baos.close(); db.close(); } catch (Exception e) { e.printStackTrace(); } } //3.从数据库中取图片 public void getPhoto() { String SELECT_SQL = "SELECT photo FROM launcher"; ImageView appIcon = (ImageView) v.findViewById(R.id.appicon);//v是我在类中定义的一个view对象，跟前面保存图片一样 byte[] photo = null; mDBService = new DBService(getContext()); SQLiteDatabase db = mDBService.getReadableDatabase(); Cursor mCursor = db.rawQuery(SELECT_SQL, null); if (mCursor != null) { if (mCursor.moveToFirst()) {//just need to query one time photo = mCursor.getBlob(mCursor.getColumnIndex("photo"));//取出图片 } } if (mCursor != null) { mCursor.close(); } db.close();     ByteArrayInputStream bais = null; if (photo != null) {         bais = new ByteArrayInputStream(photo);         appIcon.setImageDrawable(Drawable.createFromStream(bais, "photo"));//把图片设置到ImageView对象中 }     //appIcon显示的就是之前保存到数据库中的图片 }