我从网址中检索了一张图片。我想将此图像插入SQLite数据库。 我尝试在编码后插入它,但是存在一个刺痛值。任何人都可以建议如何将图片插入SQLite数据库。这是我的代码:
Login.java
final String t1=user.getId();
final String t2=user.getName();
AsyncTask<Void, Void, Bitmap> t = new AsyncTask<Void, Void, Bitmap>(){
@Override
protected Bitmap doInBackground(Void... arg0) {
// TODO Auto-generated method stub
Bitmap bm = null;
try {
URL aURL = new URL("http://graph.facebook.com/"+t1+"/picture?type=small");
URLConnection conn = aURL.openConnection();
conn.setUseCaches(true);
conn.connect();
InputStream is = conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
bm = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
}
catch (IOException e) {
e.printStackTrace();
}
return bm;
}
protected void onPostExecute(Bitmap bm){
//Drawable drawable = new BitmapDrawable(getResources(), bm);
Bitmap b1=bm;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
b1.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
// Log.w("bit",""+drawable);
String encodedImage = Base64.encodeToString(b,Base64.DEFAULT);
fbdetails.put("fbname",t2);
fbdetails.put("fbuserid",t1);
fbdetails.put("fbpic",encodedImage);
db.insertme(fbdetails);
}
};
t.execute();
}
});
Databasehandler.java
public void insertme(HashMap<String, String> queryValues) {
SQLiteDatabase database = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("fbname", queryValues.get("fbname"));
values.put("fbuserid", queryValues.get("fbuserid"));
values.put("fbpic", queryValues.get("fbpic"));
database.insert("me", null, values);
database.close();
}
答案 0 :(得分:1)
将图像放入数据库是一种糟糕的做事方式 - 你膨胀数据库b并从中获取数据,然后需要将其转换为正确的格式。而是将其存储到磁盘* (SDCARD) *并将存储它的文件名放入数据库中。然后从 SDCARD加载
答案 1 :(得分:1)
您应该查找BLOB类型信息,这是在您的数据库中存储图像的唯一方法。但是你需要先转换你的位图。
答案 2 :(得分:0)
必须编码base64 String Vist [http://developer.android.com/reference/android/util/Base64.html]
答案 3 :(得分:0)
您只应在数据库中插入图像的路径。
String path = Images.Media.insertImage(context.getContentResolver(), bm, "YourTitle", null);
将路径插入String ...
答案 4 :(得分:0)
public class ImageManipulation {
public static String encodeImage(byte[] imageByteArray) {
return Base64.encodeToString(imageByteArray, 0);
}
public static byte[] decodeImage(String imageDataString) {
return Base64.decode(imageDataString, 0);
}
public static Drawable getDrawableFromString(String imageString) {
byte[] imageBytes = decodeImage(imageString);
Drawable image = null;
image = new BitmapDrawable(BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length));
return image;
}
}
您可以使用上面的util类。
答案 5 :(得分:0)
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
public class MyDataBase extends SQLiteOpenHelper{
public MyDataBase(Context context, String dbname, CursorFactory factory, int dbversion) {
super(context, dbname, factory, dbversion);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table tableimage(image blob);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
========================================
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener{
private ImageView imageview=null;
private Button btninsert=null;
private Button btnretrive=null;
private MyDataBase mdb=null;
private SQLiteDatabase db=null;
private Cursor c=null;
private byte[] img=null;
private static final String DATABASE_NAME = "ImageDb.db";
public static final int DATABASE_VERSION = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btninsert=(Button)findViewById(R.id.button_insert);
btnretrive= (Button)findViewById(R.id.button_retrieve);
imageview= (ImageView)findViewById(R.id.imageView_image);
imageview.setImageResource(0);
btninsert.setOnClickListener(this);
btnretrive.setOnClickListener(this);
mdb=new MyDataBase(getApplicationContext(), DATABASE_NAME,null, DATABASE_VERSION);
Bitmap b=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
ByteArrayOutputStream bos=new ByteArrayOutputStream();
b.compress(Bitmap.CompressFormat.PNG, 100, bos);
img=bos.toByteArray();
db=mdb.getWritableDatabase();
}
@Override
public void onClick(View arg0) {
if(btninsert==arg0)
{
ContentValues cv=new ContentValues();
cv.put("image", img);
db.insert("tableimage", null, cv);
Toast.makeText(this, "inserted successfully", Toast.LENGTH_SHORT).show();
}
else if(btnretrive==arg0)
{
String[] col={"image"};
c=db.query("tableimage", col, null, null, null, null, null);
if(c!=null){
c.moveToFirst();
do{
img=c.getBlob(c.getColumnIndex("image"));
}while(c.moveToNext());
}
Bitmap b1=BitmapFactory.decodeByteArray(img, 0, img.length);
imageview.setImageBitmap(b1);
Toast.makeText(this, "Retrive successfully", Toast.LENGTH_SHORT).show();
}
}
}
你可以使用上面的代码..