1
在我的項目中，我需要將圖像添加到sqlite數據庫。在onCreate方法中創建數據庫之後，我將數據添加到數據庫中。要將圖像作爲android中的位圖獲取，需要使用一個Activity。這是我的代碼。SQLiteOpenHelper類中的調用活動
public class MySqlHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 15;
private static final String DATABASE_NAME = "BirdDB";
private static final String TABLE_BIRDS = "birds";
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_SINHALA_NAME = "sinhala_name";
private static final String KEY_SCIENTIFIC_NAME = "scientific_name";
private static final String KEY_DESCRIPTION = "description";
private static final String KEY_IMAGE = "image";
private static final String[] COLUMNS = {KEY_ID,KEY_NAME,KEY_SINHALA_NAME,KEY_SCIENTIFIC_NAME,KEY_DESCRIPTION,KEY_IMAGE};
public MySqlHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String CREATE_TABLE = "CREATE TABLE "+TABLE_BIRDS+" (" +
""+KEY_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, " +
""+KEY_NAME+" TEXT, "+
""+KEY_SINHALA_NAME+" TEXT, "+
""+KEY_SCIENTIFIC_NAME+" TEXT, "+
""+KEY_DESCRIPTION+" TEXT, "+
""+KEY_IMAGE+" BLOB)";
db.execSQL(CREATE_TABLE);
String name1 = "Sri Lanka Junglefowl";
String name2 = "Indian Prefowl";
String sinhalaName1 = "j,s l=l=,d";
String sinhalaName2 = "fudKrd";
String sceintficName1 = "Gallus lafayttii";
String sceintficName2 = "Pavo cristatus";
String des1 = "Male like a domestic rooster. Female:bare faced,spotted and streaked below,heavily barred on wing. Endemic.";
String des2 = "Crest of bare-shafted feathers. Male has distinctive train.";
BirdData bird1 = new BirdData(name1,sinhalaName1,sceintficName1,des1,imageHandler.getImage1());
BirdData bird2 = new BirdData(name2,sinhalaName2,sceintficName2,des2,imageHandler.getImage2());
db.insert(TABLE_BIRDS, null, addBirdData(bird1));
db.insert(TABLE_BIRDS, null, addBirdData(bird2));
}
@Override
public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS birds");
this.onCreate(db);
}
public ContentValues addBirdData(BirdData bird){
ContentValues values = new ContentValues();
values.put(KEY_NAME, bird.getName());
values.put(KEY_SINHALA_NAME, bird.getSinhalaName());
values.put(KEY_SCIENTIFIC_NAME, bird.getScientificName());
values.put(KEY_DESCRIPTION, bird.getDescription());
values.put(KEY_IMAGE, bird.getImage());
return values;
}
class ImageHandler extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
}
public byte[] getImage1(){
Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable._1);
ByteArrayOutputStream byteArrayOutputStream1 = new ByteArrayOutputStream();
bitmap1.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream1);
byte[] imageByte1 = byteArrayOutputStream1.toByteArray();
return imageByte1;
}
public byte[] getImage2(){
Bitmap bitmap2 = BitmapFactory.decodeResource(getResources(), R.drawable._2);
ByteArrayOutputStream byteArrayOutputStream1 = new ByteArrayOutputStream();
bitmap2.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream1);
byte[] imageByte2 = byteArrayOutputStream1.toByteArray();
return imageByte2;
}
}
}
在這裏，我使用了Activity類作爲SQLiteOpenHelper類的內部類。我如何在SQLiteOpenHelper類中調用該活動？
爲什麼一個活動，而不是一個普通的對象？ –
getResources（）方法僅適用於Activity – Shashika