Question

我正在开发一个用于根据kotlin中的多个图像制作视频的应用程序。我有很多Java代码，但无法以适当的方式将其转换为kotlin代码。 Alwayse遇到错误cursor.getString(column_index) must not be null。
我只是Kotlin的新手。所以任何人都可以为我的问题提供简短的解决方案。

val cursor = contentResolver.query(uri,  filePathColumn, null, null, null)
 cursor!!.moveToFirst()
 val columnIndex = cursor.getColumnIndex(filePathColumn[0])

Answer 1

嘿，我也遇到同样的问题，得到了解决方案。只需遵循我的代码即可。

private var context: Context? = null
var PICK_IMAGE_MULTIPLE = 1
lateinit var imagePath: String
var imagesPathList: MutableList<String> = arrayListOf()

首先致电画廊意图

if (Build.VERSION.SDK_INT < 19) {
            var intent = Intent()
            intent.type = "image/*"
            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
            intent.action = Intent.ACTION_GET_CONTENT
            startActivityForResult(
                Intent.createChooser(intent, "Select Picture")
                , PICK_IMAGE_MULTIPLE
            )
        } else {
            var intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
            intent.addCategory(Intent.CATEGORY_OPENABLE)
            intent.type = "image/*"
            startActivityForResult(intent, PICK_IMAGE_MULTIPLE);
        }

现在检查onActivityResult

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {

        super.onActivityResult(requestCode, resultCode, data)
        // When an Image is picked
        if (requestCode == PICK_IMAGE_MULTIPLE && resultCode == Activity.RESULT_OK
            && null != data
        ) {
            if (data.getClipData() != null) {
                var count = data.clipData.itemCount
                for (i in 0..count - 1) {
                    var imageUri: Uri = data.clipData.getItemAt(i).uri
                    getPathFromURI(imageUri)
                }
            } else if (data.getData() != null) {
                var imagePath: String = data.data.path
                Log.e("imagePath", imagePath);
            }

            displayImageData()
        }
    }

    private fun getPathFromURI(uri: Uri) {
        var path: String = uri.path // uri = any content Uri

        val databaseUri: Uri
        val selection: String?
        val selectionArgs: Array<String>?
        if (path.contains("/document/image:")) { // files selected from "Documents"
            databaseUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
            selection = "_id=?"
            selectionArgs = arrayOf(DocumentsContract.getDocumentId(uri).split(":")[1])
        } else { // files selected from all other sources, especially on Samsung devices
            databaseUri = uri
            selection = null
            selectionArgs = null
        }
        try {
            val projection = arrayOf(
                MediaStore.Images.Media.DATA,
                MediaStore.Images.Media._ID,
                MediaStore.Images.Media.ORIENTATION,
                MediaStore.Images.Media.DATE_TAKEN
            ) // some example data you can query
            val cursor = contentResolver.query(
                databaseUri,
                projection, selection, selectionArgs, null
            )
            if (cursor.moveToFirst()) {
                val columnIndex = cursor.getColumnIndex(projection[0])
                imagePath = cursor.getString(columnIndex)
               // Log.e("path", imagePath);
                imagesPathList.add(imagePath)
            }
            cursor.close()
        } catch (e: Exception) {
            Log.e(TAG, e.message, e)
        }
    }

Answer 2

这是使用Github存储库满足您要求的解决方案。

在您的应用gradle文件中添加以下行

   implementation 'com.github.esafirm.android-image-picker:imagepicker:1.13.1'
    // for experimental rx picker
    implementation 'com.github.esafirm.android-image-picker:rximagepicker:1.13.1'
    // If you have a problem with Glide, please use the same Glide version or simply open an issue
    implementation 'com.github.bumptech.glide:glide:4.8.0'

在Java类中，将其称为拾取或拍摄图像

 startActivityForResult(ImagePicker.create(getActivity())
                .multi()
                .folderMode(true)
                .returnMode(ReturnMode.ALL)
                .getIntent(getActivity()), IpCons.RC_IMAGE_PICKER);

并在onActivityResult()中获得所选图像的arraylist

 @Override
    protected void onActivityResult(int requestCode, final int resultCode, Intent data) {
        if (ImagePicker.shouldHandle(requestCode, resultCode, data)) {
            // Get a list of picked images
            List<Image> images = ImagePicker.getImages(data)
            // do your stuff here

            // or get a single image only
            //Image image = ImagePicker.getFirstImageOrNull(data)
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

此代码不太复杂，不需要处理图像的多项选择，只需添加multi（）即可启用多项选择。

注意：-复制此代码并将其粘贴到您的kotlin项目中，转换器将自动将其转换为Kotlin

从KOTLIN的图库中选择多个图像（想要的图像路径）

2 个答案: