Android 拍摄相机返回空意图

Question

我正在开发 android 应用程序，我的应用程序有按钮来拍照。之前我陷入了拍照后onActivityResult返回数据为null的状态。这是相机预期的行为，如果我们将 EXTRA_OUTPUT 放入 intent 中，它将返回 null。出于这个原因，我做了空检查代码，它运行良好。

几天后又一次，我测试了。我仍然再次陷入同样的​​问题。但是这次data 不是null。 data 具有空意图，例如 intent 和 data.getData() 变为 null。我通过检查 data.getData() == null 解决了这个问题，它再次工作。我不明白为什么会这样。只是好奇发生了什么。出于这个原因，我必须再次重新上传到生产环境。 :-(

//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

我知道如何解决问题。我不明白的是，如果我输入 EXTRA_OUTPUT，则返回 data 必须是 null。最重要的是我几周前实现的代码，我很确定data 返回null，突然它又不是null 值了。

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

}