如何检查用户从图片库中选择的图片的大小？

如何解决如何检查用户从图片库中选择的图片的大小？

在我的 Android 应用中，我允许用户从他们的图库中选择一张图片作为他们的个人资料图片。

这是从他们的图库中选择图像的代码：

profile_image_view.setonClickListener {
    val intent = Intent(Intent.ACTION_PICK)
    intent.type = "image/*"
    startActivityForResult(intent,PROFILE_REQUEST_CODE)
}

这是我的 onActivityResult 的代码：

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

    // Result of our profile image change
    if (requestCode == PROFILE_REQUEST_CODE && resultCode == Activity.RESULT_OK && data != null) {
        // Proceed and check what the selected image was
        profileImageUri = data.data!!

        // Get the bitmap of the image
        if (Build.VERSION.SDK_INT < 28) {
            profileBitmap =
                MediaStore.Images.Media.getBitmap(contentResolver,profileImageUri)
        } else {
            val source =
                imagedecoder.createSource(contentResolver,profileImageUri)
            profileBitmap = imagedecoder.decodeBitmap(source)
        }

        // Upload the user's profile image to Firebase Storage
        uploadProfileImage(profileBitmap)
    }
}

这是 uploadProfileImage 的代码：

private fun uploadProfileImage(bitmap: Bitmap) {
    loadingDialog.startLoadingDialog()
    val filename: String = auth.currentUser!!.uid
    val ref: StorageReference = storage.getReference("/images/$filename")
    ref.putFile(profileImageUri)
        .addOnSuccessListener {
            ref.downloadUrl.addOnSuccessListener {
                userInfo.child("profileImageUrl").setValue(it.toString())
                profile_image_view.setimageBitmap(bitmap)
                loadingDialog.dismissDialog()
            }
        }
        .addOnFailureListener {
            loadingDialog.dismissDialog()
            Toast.makeText(
                applicationContext,"${it.message}",Toast.LENGTH_LONG
            ).show()
        }
}

如何提醒用户他们选择的图片太大？在调用 uploadProfileImage 之前如何确定图像的大小？或者在 Firebase Storage 中是否有一种方法可以防止在尺寸太大的情况下上传图像？我希望照片大小上限为 2 MB。

解决方法

Drawable drawable = ImageView.getDrawable();
//you should call after the bitmap drawn
Rect bounds = drawable.getBounds();
int width = bounds.width();
int height = bounds.height();
int bitmapWidth = drawable.getIntrinsicWidth(); //this is the bitmap's width
int bitmapHeight = drawable.getIntrinsicHeight(); //this is the bitmap's height

创建一个bitmap然后就可以得到高度和宽度

,

我在我的项目中做了这件事，我们得到了图像文件媒体类的大小

          java.net.URI juri = null;
            try {
                juri = new java.net.URI(uri.toString());
                File mediaFile = new File(juri.getPath());
                long fileSizeInBytes = mediaFile.length();
                long fileSizeInKB = fileSizeInBytes / 1024;
                long fileSizeInMB = fileSizeInKB / 1024;

                if (fileSizeInMB > 10) {
                    Toast.makeText(this,"Video files lesser than 5MB are allowed",Toast.LENGTH_LONG).show();
                    return;
                }
                Toast.makeText(this,mediaFile.toString(),Toast.LENGTH_SHORT).show();
            } catch (URISyntaxException e) {
                e.printStackTrace();
            }

在此代码中，我们获取任何文件大小并根据文件大小设置条件... 我希望这段代码对你有用

,

您可以向上下文的内容解析器请求此内容：

fun getFileSize(context: Context,uri: Uri): Long {
    val projection = arrayOf(OpenableColumns.SIZE)
    val cursor = context.contentResolver.query(uri,projection,null,null)
    cursor?.use {
        it.moveToFirst()
        val sizeColumnId = it.getColumnIndexOrThrow(OpenableColumns.SIZE)
        return it.getLong(sizeColumnId)
    } ?: throw IllegalStateException("The information can't be resolved,probably the file doesn't exist")
}