如何在android sqlite數據庫中插入和檢索捕獲圖像

我的代碼只在運行時工作。但是，當我關閉我的應用程序並再次打開時，我沒有得到一個圖像，我得到一個應用程序關閉錯誤。我應該如何使用rawquery？如何在android sqlite數據庫中插入和檢索捕獲圖像

public static final int REQUEST_IMAGE=1; 
EditText _id,_name; 
ImageView img,img1; 
Button insert,display; 
File desi; 
String imagepath; 
private MyDataBase mdb=null; 
private SQLiteDatabase db=null; 
private Cursor c=null; 
private byte[] imge=null; 
private static final String DATABASE_NAME = "sampledp.db"; 
public static final int DATABASE_VERSION = 1; 
private String sid; 
static String name; 

TextView idid; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_image_db); 
    _id=(EditText)findViewById(R.id.edit_id); 
    _name=(EditText)findViewById(R.id.edit_name); 
    img=(ImageView)findViewById(R.id.image); 
    img1=(ImageView)findViewById(R.id.image1); 
    insert=(Button)findViewById(R.id.insert); 
    idid=(TextView)findViewById(R.id.idid); 
    display=(Button)findViewById(R.id.display); 
    mdb=new MyDataBase(getApplicationContext(), DATABASE_NAME,null, DATABASE_VERSION); 

    img.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View arg0) { 
      name=_id.getText().toString(); 
      desi=new File(Environment.getExternalStorageDirectory(),name+".JPEG"); 
      Intent i=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
      i.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(desi)); 
      startActivityForResult(i, REQUEST_IMAGE); 
     } 
    }); 
    insert.setOnClickListener(new View.OnClickListener() { 


     @Override 
     public void onClick(View arg0) { 
      Bitmap b=BitmapFactory.decodeFile(imagepath); 
      ContentValues cv=new ContentValues(); 
      ByteArrayOutputStream bos=new ByteArrayOutputStream(); 
      b.compress(Bitmap.CompressFormat.JPEG, 90, bos); 
      imge=bos.toByteArray(); 
      sid=_id.getText().toString(); 
      db=mdb.getWritableDatabase(); 
      cv.put("image", imge); 
      cv.put("ID", sid); 
      db.insert("tableimage", null, cv); 
      Toast.makeText(getApplicationContext(), "inserted successfully", Toast.LENGTH_SHORT).show(); 
     } 
    }); 
    display.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 
      // TODO Auto-generated method stub 
      String[] col={"image","ID"}; 
      c=db.rawQuery("select * from tableimage where ID="+_name.getText()+";",col); 
      if(c!=null){ 
       c.moveToFirst(); 
       do{ 
        imge=c.getBlob(c.getColumnIndex("image")); 
        sid=c.getString(c.getColumnIndex("ID")); 
       }while(c.moveToNext()); 
      } 
      Bitmap b1=BitmapFactory.decodeByteArray(imge, 0, imge.length); 

      String ii=String.valueOf(sid); 


      img1.setImageBitmap(b1); 
      idid.setText(ii); 
      Toast.makeText(getApplicationContext(), "Retrive successfully", Toast.LENGTH_SHORT).show(); 
     } 
    }); 
} 


protected void onActivityResult(int requestCode,int resultCode,Intent data){ 
    if(requestCode==REQUEST_IMAGE && resultCode==Activity.RESULT_OK){ 
     try{ 
      FileInputStream in=new FileInputStream(desi); 
      imagepath=desi.getAbsolutePath(); 
      Bitmap bb=BitmapFactory.decodeStream(in); 
      img.setImageBitmap(bb); 

     }catch(FileNotFoundException e){ 
      e.printStackTrace(); 
     } 
    } 
}

這是我的XML代碼：

<LinearLayout 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" > 

     <EditText 
      android:id="@+id/edit_id" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:hint="roll No" /> 

     <ImageView 
      android:id="@+id/image" 
      android:layout_width="100dp" 
      android:layout_height="100dp" 
      android:background="@drawable/ic_launcher" /> 

     <Button 
      android:id="@+id/insert" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:text="Insert Details" /> 

     <EditText 
      android:id="@+id/edit_name" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:hint="enter roll No" /> 

     <Button 
      android:id="@+id/display" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:text="Display Details" /> 

     <ImageView 
      android:id="@+id/image1" 
      android:layout_width="100dp" 
      android:layout_height="100dp" 
      android:background="@drawable/ic_launcher" /> 

     <TextView 
      android:id="@+id/idid" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:text="id" /> 
    </LinearLayout>

來源

2015-09-28 wingsraam

請包含錯誤日誌 – NaviRamyle

裏面顯示的點擊監聽器，你需要在調用rawQuery（）之前使用db=mdb.getReadableDatabase();。

爲您提供日誌以獲取更多詳細信息。

來源

2015-09-28 06:42:34 Parth

大概display按鍵點擊造成的問題，因爲db調用rawQuery方法之前將不會被初始化：

db=mdb.getWritableDatabase(); // missing 
c=db.rawQuery(".....");

來源

2015-09-28 05:26:22

嘗試檢查，如果參數爲null調用db.query前

來源

2015-09-28 07:02:01 prat

請檢查該

public void insetImage(Bitmap bitmap, String imageId) { 
SQLiteDatabase db = this.getWritableDatabase(); 
ContentValues values = new ContentValues(); 
values.put(IMAGE_ID, imageId); 
ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream); 
values.put(IMAGE_BITMAP, stream.toByteArray()); 
db.insert(TABLE_IMAGE, null, values); 
db.close(); 
} 


public ImageHelper getImage(String imageId) { 
SQLiteDatabase db = this.getWritableDatabase(); 
Cursor cursor2 = db.query(TABLE_IMAGE, 
new String[] {COL_ID, IMAGE_ID, IMAGE_BITMAP},IMAGE_ID 
+" LIKE '"+imageId+"%'", null, null, null, null); 
ImageHelper imageHelper = new ImageHelper(); 
if (cursor2.moveToFirst()) { 
do { 
imageHelper.setImageId(cursor2.getString(1)); 
imageHelper.setImageByteArray(cursor2.getBlob(2)); 
} while (cursor2.moveToNext()); 
} 
cursor2.close(); 
db.close(); 
return imageHelper; 
}

來源

2015-09-28 07:25:56

如何在android sqlite數據庫中插入和檢索捕獲圖像

回答

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