저장 및 안드로이드에서 sql lite 데이터베이스에서 이미지를 얻는 방법

Question

나는이 튜토리얼 http://vimaltuts.com/android-tutorial-for-beginners/android-sqlite-database-example에 따라이 코드에서 입력 및 디스플레이로 이미지를 가져 오는 데 하나 이상의 필드를 추가하는 방법은 무엇입니까?

날

 import android.app.Activity; 
import android.app.AlertDialog; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 

public class AddEditCountry extends Activity { 

private long rowID; 
private EditText nameEt; 
private EditText capEt; 
private EditText codeEt; 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.add_country); 

     nameEt = (EditText) findViewById(R.id.nameEdit); 
     capEt = (EditText) findViewById(R.id.capEdit); 
     codeEt = (EditText) findViewById(R.id.codeEdit); 

     Bundle extras = getIntent().getExtras(); 

     if (extras != null) 
     { 
     rowID = extras.getLong("row_id"); 
     nameEt.setText(extras.getString("name")); 
     capEt.setText(extras.getString("cap")); 
     codeEt.setText(extras.getString("code")); 
     } 

     Button saveButton =(Button) findViewById(R.id.saveBtn); 
     saveButton.setOnClickListener(new OnClickListener() { 

      public void onClick(View v) 
      { 
      if (nameEt.getText().length() != 0) 
      { 
       AsyncTask saveContactTask = 
        new AsyncTask() 
        { 
         @Override 
         protected Object doInBackground(Object... params) 
         { 
         saveContact(); 
         return null; 
         } 

         @Override 
         protected void onPostExecute(Object result) 
         { 
         finish(); 
         } 
        }; 

       saveContactTask.execute((Object[]) null); 
      } 

      else 
      { 
       AlertDialog.Builder alert = new 
    AlertDialog.Builder(AddEditCountry.this); 
       alert.setTitle(R.string.errorTitle); 
       alert.setMessage(R.string.errorMessage); 
       alert.setPositiveButton(R.string.errorButton, null); 
       alert.show(); 
      } 
      } 
    }); 
    } 

    private void saveContact() 
    { 
     DatabaseConnector dbConnector = new DatabaseConnector(this); 

     if (getIntent().getExtras() == null) 
     { 
      dbConnector.insertContact(nameEt.getText().toString(), 
        capEt.getText().toString(), 
        codeEt.getText().toString()); 
     } 
     else 
     { 
     dbConnector.updateContact(rowID, 
      nameEt.getText().toString(), 
      capEt.getText().toString(), 
      codeEt.getText().toString()); 
     } 
    } 
} 




       import android.os.AsyncTask; 
import android.os.Bundle; 
import android.app.ListActivity; 
import android.content.Intent; 
import android.database.Cursor; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.CursorAdapter; 
import android.widget.ListView; 
import android.widget.SimpleCursorAdapter; 
import android.widget.AdapterView.OnItemClickListener; 

public class CountryList extends ListActivity { 

public static final String ROW_ID = "row_id"; 
private ListView conListView; 
private CursorAdapter conAdapter; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    conListView=getListView(); 
    conListView.setOnItemClickListener(viewConListener); 

    // map each name to a TextView 
    String[] from = new String[] { "name" }; 
    int[] to = new int[] { R.id.countryTextView }; 
    conAdapter = new SimpleCursorAdapter(CountryList.this, R.layout.country_list, 
    null, from, to); 
    setListAdapter(conAdapter); // set adapter 
} 


@Override 
protected void onResume() 
{ 
    super.onResume(); 
    new GetContacts().execute((Object[]) null); 
} 


    @Override 
protected void onStop() 
    { 
    Cursor cursor = conAdapter.getCursor(); 

    if (cursor != null) 
     cursor.deactivate(); 

    conAdapter.changeCursor(null); 
    super.onStop(); 
}  


private class GetContacts extends AsyncTask 
{ 
    DatabaseConnector dbConnector = new DatabaseConnector(CountryList.this); 

    @Override 
    protected Cursor doInBackground(Object... params) 
    { 
     dbConnector.open(); 
     return dbConnector.getAllContacts(); 
    } 

    @Override 
    protected void onPostExecute(Cursor result) 
    { 
     conAdapter.changeCursor(result); // set the adapter's Cursor 
     dbConnector.close(); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) 
{ 
    super.onCreateOptionsMenu(menu); 
    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.country_menu, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) 
{ 
    Intent addContact = new Intent(CountryList.this, AddEditCountry.class); 
    startActivity(addContact); 
    return super.onOptionsItemSelected(item); 
} 

OnItemClickListener viewConListener = new OnItemClickListener() 
{ 
    public void onItemClick(AdapterView arg0, View arg1, int arg2,long arg3) 
    {   
     Intent viewCon = new Intent(CountryList.this, ViewCountry.class); 
     viewCon.putExtra(ROW_ID, arg3); 
     startActivity(viewCon); 
    } 
};  

} 

















     import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.database.Cursor; 
    import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.widget.TextView; 

public class ViewCountry extends Activity { 

    private long rowID; 
    private TextView nameTv; 
    private TextView capTv; 
    private TextView codeTv; 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.view_country); 

     setUpViews(); 
     Bundle extras = getIntent().getExtras(); 
     rowID = extras.getLong(CountryList.ROW_ID); 
    } 

    private void setUpViews() { 
     nameTv = (TextView) findViewById(R.id.nameText); 
     capTv = (TextView) findViewById(R.id.capText); 
     codeTv = (TextView) findViewById(R.id.codeText); 
    } 

    @Override 
    protected void onResume() 
    { 
     super.onResume(); 
     new LoadContacts().execute(rowID); 
    } 

    private class LoadContacts extends AsyncTask 
    { 
     DatabaseConnector dbConnector = new DatabaseConnector(ViewCountry.this); 

     @Override 
     protected Cursor doInBackground(Long... params) 
     { 
     dbConnector.open(); 
     return dbConnector.getOneContact(params[0]); 
     } 

     @Override 
     protected void onPostExecute(Cursor result) 
     { 
     super.onPostExecute(result); 

     result.moveToFirst(); 
     // get the column index for each data item 
     int nameIndex = result.getColumnIndex("name"); 
     int capIndex = result.getColumnIndex("cap"); 
     int codeIndex = result.getColumnIndex("code"); 

     nameTv.setText(result.getString(nameIndex)); 
     capTv.setText(result.getString(capIndex)); 
     codeTv.setText(result.getString(codeIndex)); 

     result.close(); 
     dbConnector.close(); 
     } 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) 
    { 
     super.onCreateOptionsMenu(menu); 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.view_country_menu, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) 
    { 
     switch (item.getItemId()) 
     { 
     case R.id.editItem: 
      Intent addEditContact = 
       new Intent(this, AddEditCountry.class); 

      addEditContact.putExtra(CountryList.ROW_ID, rowID); 
      addEditContact.putExtra("name", nameTv.getText()); 
      addEditContact.putExtra("cap", capTv.getText()); 
      addEditContact.putExtra("code", codeTv.getText()); 
      startActivity(addEditContact); 
      return true; 

     case R.id.deleteItem: 
      deleteContact(); 
      return true; 

     default: 
      return super.onOptionsItemSelected(item); 
     } 
    } 

    private void deleteContact() 
    { 

     AlertDialog.Builder alert = new AlertDialog.Builder(ViewCountry.this); 

     alert.setTitle(R.string.confirmTitle); 
     alert.setMessage(R.string.confirmMessage); 

     alert.setPositiveButton(R.string.delete_btn, 
     new DialogInterface.OnClickListener() 
     { 
      public void onClick(DialogInterface dialog, int button) 
      { 
       final DatabaseConnector dbConnector = 
        new DatabaseConnector(ViewCountry.this); 

       AsyncTask deleteTask = 
        new AsyncTask() 
        { 
        @Override 
        protected Object doInBackground(Long... params) 
        { 
         dbConnector.deleteContact(params[0]); 
         return null; 
        } 

        @Override 
        protected void onPostExecute(Object result) 
        { 
         finish(); 
        } 
        }; 

       deleteTask.execute(new Long[] { rowID });    
      } 
     } 
    ); 

     alert.setNegativeButton(R.string.cancel_btn, null).show(); 
    } 
} 








import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 


    public class DatabaseConnector { 

private static final String DB_NAME = "WorldCountries"; 
private SQLiteDatabase database; 
private DatabaseOpenHelper dbOpenHelper; 

public DatabaseConnector(Context context) { 
    dbOpenHelper = new DatabaseOpenHelper(context, DB_NAME, null, 1); 
} 

    public void open() throws SQLException 
    { 
     //open database in reading/writing mode 
     database = dbOpenHelper.getWritableDatabase(); 
    } 

    public void close() 
    { 
     if (database != null) 
     database.close(); 
    }  

    public void insertContact(String name, String cap, String code) 
      { 
       ContentValues newCon = new ContentValues(); 
       newCon.put("name", name); 
       newCon.put("cap", cap); 
       newCon.put("code", code); 

       open(); 
       database.insert("country", null, newCon); 
       close(); 
      } 


      public void updateContact(long id, String name, String 
     cap,String code) 
      { 
       ContentValues editCon = new ContentValues(); 
       editCon.put("name", name); 
       editCon.put("cap", cap); 
       editCon.put("code", code); 

       open(); 
       database.update("country", editCon, "_id=" + id, null); 
       close(); 
      } 


      public Cursor getAllContacts() 
      { 
       return database.query("country", new String[] {"_id", 
     "name"}, 
       null, null, null, null, "name"); 
      } 

      public Cursor getOneContact(long id) 
      { 
       return database.query("country", null, "_id=" + id, null, 
    null, null, null); 
      } 

      public void deleteContact(long id) 
      { 
       open(); 
       database.delete("country", "_id=" + id, null); 
       close(); 
      } 
} 





       import android.content.Context; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteDatabase.CursorFactory; 
    import android.database.sqlite.SQLiteOpenHelper; 

public class DatabaseOpenHelper extends SQLiteOpenHelper { 

public DatabaseOpenHelper(Context context, String name, 
     CursorFactory factory, int version) { 
    super(context, name, factory, version); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    String createQuery = "CREATE TABLE country (_id integer primary key 
    autoincrement,name, cap, code);";     
    db.execSQL(createQuery);   
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 

} 

} 

Answer 1

쉽게 SQL에서 BLOB 타입의 필드를 추가 할 수 있도록하고, 바이트 세트 같은 이미지를 넣어주세요 :

//while writing to db: 
ByteArrayOutputStream outStr = new ByteArrayOutputStream(); 
image.compress(CompressFormat.PNG, 100, outStr); 
byte[] blob = outStr.toByteArray(); 

contentValues.put("image", blob); 


//while reading from cursor: 
byte[] blob = cursor.getBlob("image"); 
Bitmap image = BitmapFactory.decodeByteArray(blob, 0, blob.length);