img=(ImageView)findViewById(R.id.img);
            take_picture=(Button)findViewById(R.id.take_picture);
            take_picture.setOnClickListener(new View.OnClickListener() {                        
                        @Override
                        public void onClick(View v) {
                                // TODO Auto-generated method stub                                
                                  Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                  startActivityForResult(intent,Activity.DEFAULT_KEYS_DIALER);
                        }
                });   
}
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
      
       if (resultCode == Activity.RESULT_OK) {
  
           String sdStatus = Environment.getExternalStorageState();
            if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
                return;
            }
            Bundle bundle = data.getExtras();
            Bitmap bitmap = (Bitmap) bundle.get("data");// 获取相机返回的数据，并转换为Bitmap图片格式
            FileOutputStream b = null;
            File file = new File("/sdcard/myImage/");
            file.mkdirs();// 创建文件夹，名称为myimage
  
           //照片的命名，目标文件夹下，以当前时间数字串为名称，即可确保每张照片名称不相同。
            String str=null;
            Date date=null;
            SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");//获取当前时间，进一步转化为字符串
            date =new Date();
            str=format.format(date);
            String fileName = "/sdcard/myImage/"+str+".jpg";
           try {
                b = new FileOutputStream(fileName);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } finally {
                try {
                    b.flush();
                    b.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (data!= null) {
                    Bitmap cameraBitmap = (Bitmap) data.getExtras().get("data");
                    System.out.println("fdf================="+data.getDataString());
                    img.setImageBitmap(cameraBitmap);
                     
                   System.out.println("成功======"+cameraBitmap.getWidth()+cameraBitmap.getHeight());
            }
            }
       }
    }
    }