png image stocker dans la base de données et récupérer dans android 1.5

Question

hai, Je suis nouveau sur android.

J'ai un problème.

Ceci est mon code mais cela ne fonctionnera pas, le problème est dans le classeur de vue.

Veuillez corriger.

// this is my activity 

package com.android.Fruits2; 

import java.util.ArrayList; 
import java.util.HashMap; 

import android.app.ListActivity; 
import android.database.Cursor; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.Bundle; 
import android.widget.SimpleAdapter; 
import android.widget.SimpleCursorAdapter; 
import android.widget.SimpleAdapter.ViewBinder; 

public class Fruits2 extends ListActivity { 


    private DBhelper mDB; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
//  setContentView(R.layout.main); 
     mDB = new DBhelper(this); 

      mDB.Reset(); 

      Bitmap img = BitmapFactory.decodeResource(getResources(), R.drawable.icon); 

      mDB.createPersonEntry(new PersonData(img, "Harsha", 24,"mca")); 


      String[] columns = {mDB.KEY_ID, mDB.KEY_IMG, mDB.KEY_NAME, mDB.KEY_AGE, mDB.KEY_STUDY}; 
      String table = mDB.PERSON_TABLE; 

      Cursor c = mDB.getHandle().query(table, columns, null, null, null, null, null); 

      startManagingCursor(c); 

      SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, 
        R.layout.data, 
        c, 
        new String[] {mDB.KEY_IMG, mDB.KEY_NAME, mDB.KEY_AGE, mDB.KEY_STUDY}, 
        new int[] {R.id.img, R.id.name, R.id.age,R.id.study}); 


      adapter.setViewBinder(new MyViewBinder()); 

      setListAdapter(adapter); 
    } 
} 


//my viewbinder 

package com.android.Fruits2; 

import android.database.Cursor; 
import android.graphics.BitmapFactory; 
import android.view.View; 
import android.widget.ImageView; 
import android.widget.SimpleCursorAdapter; 

public class MyViewBinder implements SimpleCursorAdapter.ViewBinder { 

    public boolean setViewValue(View view, Cursor cursor, int columnIndex) { 
      if((view instanceof ImageView) ) { 
       ImageView iv = (ImageView) view; 
       byte[] img = cursor.getBlob(columnIndex); 
       iv.setImageBitmap(BitmapFactory.decodeByteArray(img, 0, img.length)); 
       return true; 
      } 

     return false; 
    } 

} 

// data 

package com.android.Fruits2; 

import android.graphics.Bitmap; 

public class PersonData { 
     private Bitmap bmp; 
     private String name; 
     private int age; 
     private String study; 

     public PersonData(Bitmap b, String n, int k, String v) { 
      bmp = b; 
      name = n; 
      age = k; 
      study = v; 
     } 

     public Bitmap getBitmap() { return bmp; } 
     public String getName() { return name; } 
     public int getAge() { return age; } 
     public String getStudy() { return study; } 

} 

//dbhelper 


package com.android.Fruits2; 


import java.io.ByteArrayOutputStream; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.graphics.Bitmap; 
import android.provider.BaseColumns; 

public class DBhelper { 
    public static final String KEY_ID = BaseColumns._ID; 
    public static final String KEY_NAME = "name"; 
    public static final String KEY_AGE = "age"; 
    public static final String KEY_STUDY = "study"; 
    public static final String KEY_IMG = "image"; 

    private DatabaseHelper mDbHelper; 
    private SQLiteDatabase mDb; 

    private static final String DATABASE_NAME = "PersonalDB"; 
    private static final int DATABASE_VERSION = 1; 

    public static final String PERSON_TABLE = "Person"; 

    private static final String CREATE_PERSON_TABLE = "create table "+PERSON_TABLE+" (" 
             +KEY_ID+" integer primary key autoincrement, " 
             +KEY_IMG+" blob not null, " 
             +KEY_NAME+" text not null , " 
             +KEY_AGE+" integer not null, " 
             +KEY_STUDY+" text not null);"; 

    private final Context mCtx; 
    private boolean opened = false; 


    private static class DatabaseHelper extends SQLiteOpenHelper { 
     DatabaseHelper(Context context) { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     } 

     public void onCreate(SQLiteDatabase db) { 
      db.execSQL(CREATE_PERSON_TABLE); 
     } 

     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      db.execSQL("DROP TABLE IF EXISTS "+PERSON_TABLE); 
      onCreate(db); 
     } 
    } 

    public void Reset() { 
    openDB(); 
    mDbHelper.onUpgrade(this.mDb, 1, 1); 
    closeDB(); 
    } 

    public DBhelper(Context ctx) { 
     mCtx = ctx; 
     mDbHelper = new DatabaseHelper(mCtx); 
    } 

    private SQLiteDatabase openDB() { 
     if(!opened) 
      mDb = mDbHelper.getWritableDatabase(); 
     opened = true; 
     return mDb; 
    } 

    public SQLiteDatabase getHandle() { return openDB(); } 

    private void closeDB() { 
     if(opened) 
      mDbHelper.close(); 
     opened = false; 
    } 

    public void createPersonEntry(PersonData about) { 
    openDB(); 
     ByteArrayOutputStream out = new ByteArrayOutputStream(); 
     about.getBitmap().compress(Bitmap.CompressFormat.PNG, 100, out); 
     ContentValues cv = new ContentValues(); 
     cv.put(KEY_IMG, out.toByteArray());    
     cv.put(KEY_NAME, about.getName()); 
     cv.put(KEY_AGE, about.getAge()); 
     cv.put(KEY_STUDY, about.getStudy()); 
     mDb.insert(PERSON_TABLE, null, cv); 
     closeDB(); 
    } 



} 


//data.xml 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"> 

    <ImageView 
     android:id = "@+id/img" 
     android:layout_width = "wrap_content" 
     android:layout_height = "wrap_content" 
     > 
    </ImageView> 

    <TextView 
     android:id = "@+id/name" 
     android:layout_width = "wrap_content" 
     android:layout_height = "wrap_content" 
     android:textSize="15dp" 
     android:textColor="#ff0000" 
     > 
    </TextView> 

    <TextView 

     android:id = "@+id/age" 
     android:layout_width = "wrap_content" 
     android:layout_height = "wrap_content" 
     android:textSize="15dp" 
     android:textColor="#ff0000" 
     /> 


    <TextView 
     android:id = "@+id/study" 
     android:layout_width = "wrap_content" 
     android:layout_height = "wrap_content" 
     android:textSize="15dp" 
     android:textColor="#ff0000" 
/> 


</LinearLayout> 

Lorsque je l'exécute dans android 1.6 et 2.1, cela fonctionne.

Mais quand je cours dans android 1.5, ne fonctionne pas.

Mon application est android 1.5.

Veuillez corriger et m'envoyer du code.

Merci.

Answer 1

Si vous avez une grande quantité de données binaires à ajouter, il n'est pas bon de mettre dans la ligne. Mais vous devez insérer dans la ligne un lien vers un fichier. Android gérer que, comme l'exemple suivant:

Exemple d'Android Documentation:

import android.provider.MediaStore.Images.Media; 
import android.content.ContentValues; 
import java.io.OutputStream; 

// Save the name and description of an image in a ContentValues map. 
ContentValues values = new ContentValues(3); 
values.put(Media.DISPLAY_NAME, "road_trip_1"); 
values.put(Media.DESCRIPTION, "Day 1, trip to Los Angeles"); 
values.put(Media.MIME_TYPE, "image/jpeg"); 

// Add a new record without the bitmap, but with the values just set. 
// insert() returns the URI of the new record. 
Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values); 

// Now get a handle to the file for that record, and save the data into it. 
// Here, sourceBitmap is a Bitmap object representing the file to save to the database. 
try { 
    OutputStream outStream = getContentResolver().openOutputStream(uri); 
    sourceBitmap.compress(Bitmap.CompressFormat.JPEG, 50, outStream); 
    outStream.close(); 
} catch (Exception e) { 
    Log.e(TAG, "exception while writing image", e); 
} 

Hope this aide.

Salut.