相机拍照即时保存，即时读取

拍照发feed，进入相机拍照界面，如果拍完了却不想发了，然后回到相册界面，要有你刚刚拍的那张，就是这么一个需求。

首先Camera的拍照方法camera.takePicture(null, null, new MyPictureCallback());
回调接口

private final class MyPictureCallback implements Camera.PictureCallback {

    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        cameraParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
        camera.setParameters(cameraParameters);
        try {
            saveToSDCard(data); // 保存图片到sd卡中
         } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

下面就是这次我们要讲的重点了。

public void saveToSDCard(byte[] data) throws IOException {
      File photo = this.getPhotoPath();
      if (photo.exists()) {
          photo.delete();
      }
      Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
      Matrix matrix = new Matrix();
      //此处的degree有两个值，预防拍照反转，90度和270度，三星手机操蛋。你要判断处理一下，是90还是270.
      matrix.postRotate(degree);
      int width = bmp.getWidth();
      int height = bmp.getHeight();
      bmp = Bitmap.createBitmap(bmp, 0, 0, width, height, matrix, true);
      try {
          FileOutputStream e = new FileOutputStream(photo.getPath());
          BufferedOutputStream bos = new BufferedOutputStream(e);
          bmp.compress(Bitmap.CompressFormat.JPEG, 100, e);
          bos.write(data);
          //如果要想把data保存到disk上面，你必须flush and sync刷新并同步一下
          bos.flush();
          e.getFD().sync();
          bos.close();
          if (scanSavedImage) {
   MediaScannerConnection.scanFile(getActivity(), new String[]{photo.getPath()}, SCAN_TYPES, null);
          }
      } catch (IOException ie) {
          Log.e(this.getClass().getSimpleName(), "Exception in setPreviewDisplay()", ie);
      }
      try {
          //拍照完成跳到裁剪界面的逻辑处理
          Intent intent = this.getIntent();
          startActivity(intent);
          finish();
          }
      } catch (Throwable e) {
          e.printStackTrace();
      }
  }

  protected File getPhotoPath() {
      File dir = this.getPhotoDirectory();
      dir.mkdirs();
      return new File(dir, this.getPhotoFilename());
  }

  protected File getPhotoDirectory() {
      if (this.photoDirectory == null) {
          this.initPhotoDirectory();
      }

      return this.photoDirectory;
  }

  private void initPhotoDirectory() {
      this.photoDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
  }

  protected String getPhotoFilename() {
      String ts = (new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US)).format(new Date());
      return "Photo_" + ts + ".jpg";
  }

这些代码拿进你的项目就可以用。

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