android 相机：onActivityResult() 意图是 null 如果它有额外的

android camera: onActivityResult() intent is null if it had extras

提问by dvrm

After searching a lot in all the related issues at Stack Overflow and finding nothing, please try to help me.

在 Stack Overflow 的所有相关问题中搜索了很多但一无所获后，请尝试帮助我。

I created an intent for capture a picture. Then I saw different behavior at onActivityResult(): if I don't put any extra in the Intent (for small pics) the Intent in onActivityResult is ok, but when I put extras in the intent for writing the pic to a file, the intent in onActivityResult is null!

我创建了一个用于捕获图片的意图。然后我看到了不同的行为onActivityResult()：如果我没有在 Intent 中添加任何额外内容（对于小图片），则 onActivityResult 中的 Intent 是可以的，但是当我将额外内容放入将图片写入文件的意图中时，onActivityResult 中的意图是null！

The Intent creation:

意图创建：

Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// without the following line the intent is ok
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(takePictureIntent, actionCode);

Why is it null, and how can I solve it?

为什么它为空，我该如何解决？

回答by richardtz

It happens the same to me, if you are providing MediaStore.EXTRA_OUTPUT, then the intent is null, but you will have the photo in the file you provided (Uri.fromFile(f)).

它发生在我身上，如果您提供MediaStore.EXTRA_OUTPUT，则意图为空，但是您将在您提供的文件中拥有照片 ( Uri.fromFile(f))。

If you don't specify MediaStore.EXTRA_OUTPUTthen you will have an intent which contains the uri from the file where the camera has saved the photo.

如果您没有指定，MediaStore.EXTRA_OUTPUT那么您将拥有一个包含来自相机保存照片的文件中的 uri 的意图。

Don't know if it as a bug, but it works that way.

不知道它是否是一个错误，但它是这样工作的。

EDIT:So in onActivityResult() you no longer need to check for data if null. The following worked with me:

编辑：因此在 onActivityResult() 中，如果为 null，则不再需要检查数据。以下与我一起工作：

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case PICK_IMAGE_REQUEST://actionCode
            if (resultCode == RESULT_OK && data != null && data.getData() != null) {
                //For Image Gallery
            }
            return;

        case CAPTURE_IMAGE_REQUEST://actionCode
            if (resultCode == RESULT_OK) {
                //For CAMERA
                //You can use image PATH that you already created its file by the intent that launched the CAMERA (MediaStore.EXTRA_OUTPUT)
                return;
            }
    }
}

Hope it helps

希望能帮助到你

回答by Eugen Pechanec

A sample written in Kotlin. You create a Urifor camera app, CameraFragmentholds it until camera returns from saving your picture and gives it back to you in onActivityResultas you would expect.

用 Kotlin 编写的示例。您创建了一个Uri相机应用程序，CameraFragment保持它直到相机从保存您的照片中返回并onActivityResult按照您的预期将其返回给您。

CameraFragment.kt

相机片段.kt

Acts as an intermediary between consumer and camera app. Takes Urias input and returns it in data Intent.

充当消费者和相机应用程序之间的中介。注意到Uri作为输入，并在数据返回它Intent。

class CameraFragment : Fragment() {

    companion object {
        val TAG = CameraFragment::class.java.simpleName

        private val KEY_URI = ".URI"

        fun newInstance(uri: Uri, targetFragment: Fragment, requestCode: Int): CameraFragment {
            val args = Bundle()
            args.putParcelable(KEY_URI, uri)
            val fragment = CameraFragment()
            fragment.arguments = args
            fragment.setTargetFragment(targetFragment, requestCode)
            return fragment
        }
    }

    private lateinit var uri: Uri

    private var fired = false

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        retainInstance = true

        fired = savedInstanceState?.getBoolean("fired") ?: false

        if (!fired) {
            val args = arguments
            uri = args.getParcelable(KEY_URI)

            val i = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
            i.putExtra(MediaStore.EXTRA_OUTPUT, uri)
            i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
            context.grantUriPermission(i, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)

            startActivityForResult(i, targetRequestCode)
            fired = true
        }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        outState.putBoolean("fired", fired)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)

        if (requestCode == targetRequestCode) {
            context.revokeUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)

            val newData = Intent()
            newData.data = uri
            targetFragment.onActivityResult(requestCode, resultCode, newData)

            dismiss()
        }
    }

    private fun dismiss() {
        fragmentManager.beginTransaction().remove(this).commit()
    }
}

/** Grant Uri permissions for all camera apps. */
fun Context.grantUriPermission(intent: Intent, uri: Uri, modeFlags: Int) {
    val resolvedIntentActivities = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
    for (resolvedIntentInfo in resolvedIntentActivities) {
        val packageName = resolvedIntentInfo.activityInfo.packageName;
        grantUriPermission(packageName, uri, modeFlags);
    }
}

Invoke camera intent

调用相机意图

thisis a fragment in your app which will trigger the camera. RC_CAMERAis your request code for this action.

this是您的应用程序中将触发相机的片段。RC_CAMERA是您对此操作的请求代码。

val uri = /* Your output Uri. */
val f = CameraFragment.newInstance(uri, this, RC_CAMERA)
fragmentManager.beginTransaction().add(f, CameraFragment.TAG).commit()

Handle camera result

处理相机结果

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)

    when(requestCode) {
        RC_CAMERA -> {
            if (resultCode == Activity.RESULT_OK) {
                val uri = data?.data
                // Do whatever you need.
            }
        }
    }
}

回答by Pradeep Kumar

When we will capture the image from Camera in android then Urior data.getdata()comes null. we have two solutions to resolve this issue.

当我们将捕捉从相机图像中的机器人则Uri或data.getdata()来自空。我们有两种解决方案来解决这个问题。

1. We can got the Uri path from the Bitmap Image
2. We can got the Uri path from cursor.

1. 我们可以从 Bitmap Image 中得到 Uri 路径
2. 我们可以从游标中获取 Uri 路径。

I will implement all methods here, Please carefully watch and read these:-

我将在这里实现所有方法，请仔细观看并阅读这些：-

First i will tell how to get Uri from Bitmap Image: Complete code is :

首先，我将告诉如何从位图图像获取 Uri：完整代码是：

First we will capture image through Intent that will same for both methods so this code i will write one time only here :

首先，我们将通过 Intent 捕获图像，这对于两种方法都是相同的，因此这段代码我只会在这里写一次：

 // Capture Image


  captureImg.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (intent.resolveActivity(getPackageManager()) != null) {
                startActivityForResult(intent, reqcode);
            }

        }
    });

Now we will Implement OnActivityResult :-(This will be same for both above 2 methods):-

现在我们将实现 OnActivityResult :-(这对于上述两种方法都是相同的):-

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


            if(requestCode==reqcode && resultCode==RESULT_OK)
            {

    Bitmap photo = (Bitmap) data.getExtras().get("data");
    ImageView.setImageBitmap(photo);

                // CALL THIS METHOD TO GET THE URI FROM THE BITMAP
                Uri tempUri = getImageUri(getApplicationContext(), photo);

                \ Show Uri path based on Image
                Toast.makeText(LiveImage.this,"Here "+ tempUri, Toast.LENGTH_LONG).show();

               \ Show Uri path based on Cursor Content Resolver
                Toast.makeText(this, "Real path for URI : "+getRealPathFromURI(tempUri), Toast.LENGTH_SHORT).show();
    }
            else
            {
                Toast.makeText(this, "Failed To Capture Image", Toast.LENGTH_SHORT).show();
            }
        }

\now we will create all above method to create Uri from Image and Cursor methods via classes:

\现在我们将创建上述所有方法，以通过类从 Image 和 Cursor 方法创建 Uri：

Now URI path from Bitmap Image

现在来自位图图像的 URI 路径

 private Uri getImageUri(Context applicationContext, Bitmap photo) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        photo.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
        String path = MediaStore.Images.Media.insertImage(LiveImage.this.getContentResolver(), photo, "Title", null);
        return Uri.parse(path);
    }

\ Uri from Real path of saved image

\来自保存图像的真实路径的Uri

  public String getRealPathFromURI(Uri uri) {
        Cursor cursor = getContentResolver().query(uri, null, null, null, null);
        cursor.moveToFirst();
        int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
        return cursor.getString(idx);
    }

回答by Mun0n

Where did you create the ffor the Uri.fromFile(f)?

你在哪里创建f的Uri.fromFile(f)？

It must be a valid Fileobject. Try to create it before the EXTRA_OUTPUTline.

它必须是一个有效的File对象。尝试EXTRA_OUTPUT在行之前创建它。

File f = new File("valid path");

Try with something like this:

尝试这样的事情：

File file = new File(dataFile);
Uri outFileUri = Uri.fromFile(file);
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, outFileUri);
startActivityForResult(intent, TAKE_PHOTO);

回答by Jaden Gu

use the following:

使用以下内容：

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

位图 bitmap = data.getExtras().getParcelable("data");

it works.

有用。