android创建数据库(SQLite)保存图片示例

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;@H_619_6@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) {@H_619_6@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
}