Question

我正在开发Android应用程序，我的应用程序有按钮拿相机。之前我已经陷入了一种状态，即在 null 之后， onActivityResult 中的返回数据。这是相机预期的行为，如果我们将EXTRA_OUTPUT置于意图中，它将返回null。出于这个原因，我做了空检查代码，它很好。

现在又过了几天，我进行了测试。我仍然陷入同样的问题。但这次data不是null。 data具有空意图，例如intent和data.getData()成为null。我通过检查data.getData() == null来修复此问题，然后再次运行。我不知道为什么会这样。只是好奇发生了什么事。出于这个原因，我必须重新上传到生产。： - （

//camera intent
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
takePictureIntent.putExtra("requestCode", Constants.REQUEST_IMAGE_CAPTURE);

Intent chooseImageIntent = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
chooseImageIntent.setType("image/* video/*");
chooseImageIntent.putExtra(Intent.EXTRA_LOCAL_ONLY, true);
chooseImageIntent.putExtra("requestCode", Constants.REQUEST_CHOOSE_FROM);

//app can use camera
if (takePictureIntent.resolveActivity(mContext.getPackageManager()) != null) {
    //add output file path which camera will save image to
    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Helpers.getOutputMediaFileUri());
    //create choose
    Intent chooser = Intent.createChooser(chooseImageIntent, "Select From");
    //add take camera intent as first intent
    chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS,new Intent[]{takePictureIntent});
    //open up dialog
    ((Activity) mContext).startActivityForResult(chooser, Constants.REQUEST_CHOOSE_FROM);
} else {
    ((Activity) mContext).startActivityForResult(chooseImageIntent, Constants.REQUEST_IMAGE_GALLERY);
}

已编辑

我知道如何解决这个问题。我不明白的是，如果我输入 EXTRA_OUTPUT ，则返回data必须为null。最重要的是我几周前实施的代码，我很确定data返回null并且突然再次显示非null值。

Answer 1

Actually the camera intent doesnot return the data in intent because after getting image it kill the activity.

so try this


 void opencameraForPicture(int requestCode, Uri fileUri) {
        checkPermissionForMarshMello(Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE);


        Intent intent = new Intent(Constants.CAMERA_INTERNAL_CLASS);

        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        /* start activity for result pass intent as argument and request code */
        startActivityForResult(intent, requestCode);

    }

    /**
     * This method set the path for the captured image from camera for adding
     * the new  picture in the list
     */
    private Uri getOutputMediaFile() {

        File mediaStorageDir = new File(
                Environment.getExternalStorageDirectory(), "."
                + Constants.CONTAINER);

        // Create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            mediaStorageDir.mkdirs();
        }

        File mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + System.currentTimeMillis() + ".png");
        Uri uri = null;
        if (mediaFile != null) {
            uri = Uri.fromFile(mediaFile);

        }
        return uri;
    }

in @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

String imagePath = fileUri.getPath();

//you can decode this path as bitmap

}

Android采取相机返回空意图

1 个答案: