关于activity跳转的问题 急求解答

我的activity跳转传值成功啦   但是在那个新页面上不停留  一闪就有跳走到别的页面啦  不知道是怎么回事
 以下是我  的程序
 public class ShowPicActivity extends Activity {
 private ImageView reView;
 private String pictureId;
 private Button next;
 private Button last;
 private Button share;
 private Button delete;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_show_pic);
   reView=(ImageView)findViewById(R.id.sView);
   Intent intent = getIntent();
      Bundle data = intent.getExtras();
      pictureId = data.getString("pictureId");
      System.out.println("跳转接受pictureId-----------------------"+pictureId);
      readPictureTask read=new readPictureTask();
      read.doInBackground();
      next=(Button)findViewById(R.id.next);
      last=(Button)findViewById(R.id.last);
      delete=(Button)findViewById(R.id.delete);
      share=(Button)findViewById(R.id.share);
 }
 class readPictureTask extends AsyncTask<byte[], String, String>{
   protected String doInBackground(byte[]... params) {
    // TODO Auto-generated method stub
    //创建文件
        try{
     //方法一
        System.out.println("path1--------------------------");
           Bitmap bmp = BitmapFactory.decodeFile(pictureId);
           System.out.println("path2--------------------------");
           @SuppressWarnings("deprecation")
     BitmapDrawable bmpDraw=new BitmapDrawable(bmp);
           System.out.println("path3--------------------------");
     reView.setImageDrawable(bmpDraw);
     System.out.println("path4--------------------------");
    }catch(Exception e){
     e.printStackTrace();
    }
    return null;
   } }
 }