android拍照保存被压缩

使用Intent调用系统的拍照功能时，

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

，并用onActivityResult方法中的data得到的bitmap，实际是被压缩过的。

为了得到原始图片（未被压缩），给intent添加

intent.putExtra(MediaStore.EXTRA_OUTPUT,uri)

属性，这种方式的过程就是将拍摄的图片存储到uri路径中，而onActivityResult只是负责显示照片，也就是说提前确定存储的路径。

btnPhoto.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
File out = new File(getPhotopath());
Uri uri = Uri.fromFile(out);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent, SELECT_CAMER);
}
});

protected String getPhotopath() {
String path = Environment.getExternalStorageDirectory()+"/my/"
File file = new File(path);
if(!file.exists()){
file.mkdir();// 创建文件夹
}
String fileName = "test.jpg";
return path + fileName;
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == SELECT_CAMER && resultCode == Activity.RESULT_OK){
Bitmap bitmap = getBitmapFromUrl(getPhotopath(), 300, 400);
saveScalePhoto(bitmap);
mImage.setImageBitmap(bitmap);
}
}

/**
* 根据路径获取图片资源
*/
private Bitmap getBitmapFromUrl(String url, double width, double height) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true; // 设置了此属性一定要记得将值设置为false
Bitmap bitmap = BitmapFactory.decodeFile(url);
// 防止OOM发生
options.inJustDecodeBounds = false;
int mWidth = bitmap.getWidth();
int mHeight = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = 1;
float scaleHeight = 1;
//        try {
//            ExifInterface exif = new ExifInterface(url);
//            String model = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
// 按照固定宽高进行缩放
// 这里希望知道照片是横屏拍摄还是竖屏拍摄
// 因为两种方式宽高不同，缩放效果就会不同
// 这里用了比较笨的方式
if(mWidth <= mHeight) {
scaleWidth = (float) (width/mWidth);
scaleHeight = (float) (height/mHeight);
} else {
scaleWidth = (float) (height/mWidth);
scaleHeight = (float) (width/mHeight);
}
//        matrix.postRotate(90); /* 翻转90度 */
// 按照固定大小对图片进行缩放
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, mWidth, mHeight, matrix, true);
// 用完了记得回收
bitmap.recycle();
return newBitmap;
}

/**
* 存储缩放的图片
* @param data 图片数据
*/
private void saveScalePhoto(Bitmap bitmap) {
// 照片全路径
String fileName = "";
// 文件夹路径
String pathUrl = Environment.getExternalStorageDirectory().getPath()+"/my/";
String imageName = "test.jpg";
FileOutputStream fos = null;
File file = new File(pathUrl);
file.mkdirs();// 创建文件夹
fileName = pathUrl + imageName;
try {
fos = new FileOutputStream(fileName);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}