如何获取uri捕获的照片？

Question

我想要实现什么？我想获取捕获图像的URI并将其保存在Firebase上.我尝试了什么？首先,我需要打开相机.以下是我的表现:

 Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null)
        startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);

捕获图像后,我需要获取图像的URI.以下是我的表现:

if (resultCode == Activity.RESULT_OK) {
        if (requestCode == CAMERA_REQUEST_CODE) {
            if (data != null) {
                if (data.getData() != null) {
                   Uri capturedImageUri = data.getData(); 
                } else {
                    Toast.makeText(getContext(), getString(R.string.coudldnt_get_photo), Toast.LENGTH_SHORT).show();
                }
            } else {
                Toast.makeText(getContext(), getString(R.string.coudldnt_get_photo), Toast.LENGTH_SHORT).show();
            }

一切都很好.但仅限于某些设备.我认为它仅适用于超过21个设备的API级别.在其他设备中,getData()返回null.

那么,接下来我做了什么？我发现我可以通过以下代码获取图像的Bitmap:

Bitmap bitmap = (Bitmap)data.getExtras().get("data") ; 

所以,我有一个图像的位图.我需要获取此图像的URI.以下是我的表现:

public Uri getImageUri(Context inContext, Bitmap inImage) {
  String path = 
  Images.Media.insertImage(inContext.getContentResolver(), inImage, 
  "Title", null);
  return Uri.parse(path);
 } 

上面的代码返回我的URI,但图像质量非常差.

所以,我一直在寻找解决方案.并且发现正确的方法是在我启动时创建文件CameraActivity并保存该文件的uri.而onActivityResult我试图让这个URI.以下是我的表现:

Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null) {
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {

        }
        if (photoFile != null) {
            Uri photoUri = FileProvider.getUriForFile(getContext(), "i_dont_know_what_to_write_here", photoFile);
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
            startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);
        }

    }

我onActivityResult成了:

    if (resultCode == Activity.RESULT_OK) {
    if (requestCode == CAMERA_REQUEST_CODE) {
        if (data != null) {
 Uri capturedPhotoUri = 
 data.getParcelableExtra(MediaStore.EXTRA_OUTPUT);
   } else {
   Toast.makeText(getContext(), 
   getString(R.string.coudldnt_get_photo), Toast.LENGTH_SHORT).show();
            }

以上概念需要在清单上添加一些标签:

 <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="i_dont_know_what_to_write_here"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/my_paths" />
        </provider>

我的xml文件是:

<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-files-path name="images"/>
</paths>

上面的方法不起作用,因为dataon onActivityReuslt为null.

那么,为了实现我的目标,我需要做些什么呢？

Answer 1

按照以下步骤.

步骤1:在res/xml文件夹中创建provider_paths.xml并在其中写下代码.

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="external_files"
        path="." />
</paths>

步骤2:在清单中声明提供者,如下所示.

       <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths" />
        </provider>

步骤3:将您的相机意图写入如下.

    Intent m_intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    File file = new File(Environment.getExternalStorageDirectory(), "MyPhoto.jpg");
    Uri uri = FileProvider.getUriForFile(this, this.getApplicationContext().getPackageName() + ".provider", file);
    m_intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, uri);
    startActivityForResult(m_intent, REQUEST_CAMERA_IMAGE);

步骤4:在onActivityResult中处理相机结果,如下所示.

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {

        //TODO... onCamera Picker Result
        case REQUEST_CAMERA_IMAGE:
            if (resultCode == RESULT_OK) {

              //File object of camera image
                File file = new File(Environment.getExternalStorageDirectory(), "MyPhoto.jpg");

              //Uri of camera image
                Uri uri = FileProvider.getUriForFile(this, this.getApplicationContext().getPackageName() + ".provider", file);

            }
            break;
    }
}

Answer 2

在调用相机意图时

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);


 File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), "IMG_FOLDER");

        try {
            if (!mediaStorageDir.exists()) {
                if (!mediaStorageDir.mkdirs()) {
                    return null;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }


        imageURI = Uri.fromFile(new File(mediaStorageDir.getPath() + File.separator +
                "profile_img.jpg"));
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageURI);

        startActivityForResult(intent, Utils.CAMERA_REQUEST);

在 onActivityResult 里面

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        try {
            if (resultCode == RESULT_OK) {
                if (requestCode == Utils.CAMERA_REQUEST) {
                    if (imageURI != null) {             // use the same uri, that you initialized while calling camera intent
                     // do whatever you want to do with this Uri
                 }
                }
            }
         } catch(Exception E) {}  
  }

对于牛轧糖，您需要在启动/启动器活动中添加以下代码

if (Build.VERSION.SDK_INT >= 24) {
        try {
            Method m = StrictMode.class.getMethod("disableDeathOnFileUriExposure");
            m.invoke(null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

这将适用于所有版本。我也测试过了。