目前我正在使用自定义相机应用程序,预览看起来很好。但是当我拍摄照片并在我的其他活动中显示时,图片已经减少了80%。谁知道为什么会这样?同样在画廊,质量很差。 我正在使用android中的Camera API演示。
我的参数:
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
parameters = mCamera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
parameters.setFlashMode(Parameters.FLASH_MODE_AUTO);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
parameters.setJpegQuality(100);
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
parameters.setRotation(90);
Display display = ((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
if (display.getRotation() == Surface.ROTATION_0) {
mCamera.setDisplayOrientation(90);
} else if (display.getRotation() == Surface.ROTATION_270) {
mCamera.setDisplayOrientation(180);
}
mCamera.setParameters(parameters);
mCamera.startPreview();
}
代码保存图片:
private PictureCallback mPicture = new PictureCallback() {
private String TAG = "DocsPro";
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null) {
Log.d(TAG, "Error creating media file, check storage permissions : PICTURE FILE IS NULL");
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
String filepath = pictureFile.getAbsolutePath();
Intent edit = new Intent(TakePhoto.this, EditPhoto.class);
edit.putExtra("filepath", filepath);
startActivity(edit);
finish();
} catch (FileNotFoundException e) {
Log.d(TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(TAG, "Error accessing file: " + e.getMessage());
}
}
};
private static File getOutputMediaFile(int type) {
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "DocsPro");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_" + timeStamp + ".jpg");
} else {
return null;
}
return mediaFile;
}
答案 0 :(得分:6)
解决问题: 我只是把它放在预览课上改变的表面。
List<Camera.Size> sizes = parameters.getSupportedPictureSizes();
Camera.Size size = sizes.get(0);
for(int i=0;i<sizes.size();i++)
{
if(sizes.get(i).width > size.width)
size = sizes.get(i);
}
parameters.setPictureSize(size.width, size.height);
然后只调整位图大小,因为图片很大:
imageView = (ImageView) findViewById(R.id.Image);
Bitmap bp = BitmapFactory.decodeFile(imagePath);
Bitmap resized = Bitmap.createScaledBitmap(bp,(int)(bp.getWidth()*0.7), (int)(bp.getHeight()*0.7), true);
imageView.setImageBitmap(resized);