从相机拍摄的android图片非常小

我试图从相机捕获图像,压缩它,然后将其存储到SD卡.如果我使用下面的代码直接将其保存到SD卡,我会得到完整的图像.但是,如果我尝试在系统中加载图像,我会得到一个超小的图像大小,如320 x 240而不是完整的5 mp图像.

        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
    intent.putExtra(MediaStore.EXTRA_OUTPUT,getimageUri());
    startActivityForResult(intent,CAMERA_PIC_REQUEST);  
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getimageURI()的位置

    private Uri getimageUri() {
    // Store image in dcim
    file = new File(Environment.getExternalStorageDirectory() + "/DCIM","itshelp.jpg");
    imguri = Uri.fromFile(file);
    file.deleteOnExit();
       Log.e("syS","file is at "+imguri);
    return imguri;
}
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现在,当我尝试将其保存到内部存储器时,我使用以下代码来获取微小的图像：

    public void imageFromCamera() { //code to retrieve image
    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
    startActivityForResult(intent,CAMERA_PIC_REQUEST);  
    }
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在我的startActivitForResult中我有以下内容：

    @Override
protected void onActivityResult(int requestCode,int resultCode,Intent data) {  
    super.onActivityResult(requestCode,resultCode,data);
    if (requestCode == CAMERA_PIC_REQUEST && resultCode == RESULT_OK) {
        Bitmap bm = (Bitmap) data.getExtras().get("data"); 
        Log.e("sys","width is "+bm.getWidth()); //im gettting an extremely small width here

        OutputStream outStream = null;
        file = new File(Environment.getExternalStorageDirectory() + "/DCIM","itshelp.png");
        try {
         outStream = new FileOutputStream(file);
         bm.compress(Bitmap.CompressFormat.JPEG,70,outStream);
         outStream.flush();
         outStream.close();

         Log.i("Hub","OK,Image Saved to SD");
         Log.i("Hub","height = "+ bm.getHeight() + ",width = " + bm.getWidth());

        } catch (FileNotFoundException e) {

         e.printstacktrace();
         Log.i("Hub","FileNotFoundException: "+ e.toString());

        } catch (IOException e) {

         e.printstacktrace();
         Log.i("Hub","IOException: "+ e.toString());
        }



    }
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最佳答案

在没有MediaStore.EXTRA_OUTPUT的情况下调用相机意图时,相机仅返回一个小缩略图,因为意图包不是为了传递大内存块而设计的.
从SDK文档for MediaStore：

标准意图动作,可以发送给相机应用程序捕获图像并将其返回.
调用者可以传递额外的EXTRA_OUTPUT来控制该图像的写入位置.如果EXTRA_OUTPUT不存在,则在额外字段中返回小尺寸图像作为Bitmap对象.这对于只需要小图像的应用程序非常有用.如果存在EXTRA_OUTPUT,则将将全尺寸图像写入EXTRA_OUTPUT的Uri值.