感谢mklkj。

这是一个活动版本。

fileChooserContract可以选择一个图像。 filesChooserContract可以选择多张图片。

class MainActivity : AppCompatActivity() {

    companion object {
        private const val TAG = "MainActivity"
    }

    lateinit var viewBinding: ActivityMainBinding

    private val fileChooserContract = registerForActivityResult(ActivityResultContracts.GetContent()) { uri ->
        Log.d(TAG, "onActivityResult: uri $uri")
    }

    private val filesChooserContract = registerForActivityResult(ActivityResultContracts.GetMultipleContents()) { uriList ->
        for (uri in uriList) {
            Log.d(TAG, "onActivityResult: uri $uri")
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        viewBinding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(viewBinding.root)

        viewBinding.btnPick.setOnClickListener {
            fileChooserContract.launch("image/*")
        }

        viewBinding.btnPickMulti.setOnClickListener {
            filesChooserContract.launch("image/*")
        }
    }
}

你可以做的比下面的回答更简单:

Uri Selected_Image_Uri = data.getData();
ImageView imageView = (ImageView) findViewById(R.id.loadedimg);
imageView.setImageURI(Selected_Image_Uri);

Kotlin:当你想提示用户时，打开ACTION_GET_CONTENT事件:

val intent = Intent(Intent.ACTION_GET_CONTENT).apply { type = "image/*" }
startActivityForResult(intent, 9998)

当用户选择了一张图片后，在Activity的onActivityResult函数中处理该事件。作为一个例子，我在一个ImageView中显示它，并将它存储在应用程序缓存中:

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (requestCode == 9998) {
        val uri: Uri = data?.data ?: return
        val bytes = contentResolver.openInputStream(uri)?.readBytes() ?: return
        imageView.setImageBitmap(BitmapFactory.decodeByteArray(bytes, 0, bytes.size))
        File("$cacheDir/imgPicked").writeBytes(bytes)  // if needed: store to cache
    }
}

理想情况下，将9998替换为应用程序使用的一些内部请求代码。这只是为了区分回调与您自己的请求。

与getParcelable("data")不同，它不需要任何权限。

注意，这不会处理设置它的图像上的Exif旋转位，因此一些图像最终会出现不正确的方向(Kotlin解决方案)。

选项1

下面的代码允许用户从任何文件资源管理器应用程序中选择图像

Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_CODE);

但在某些设备中，上述解决方案不会获取带有EXIF信息(如方向)的图像。因此，在这些设备中，改变图像方向等EXIF处理无法按预期进行。

选项2

下面的代码允许用户从任何图库应用程序中选择图像

Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult ( intent, PICK_IMAGE_CODE );

但在某些设备中，在设置意图类型时，上述解决方案将清除可能阻碍图库打开过程的意图数据(MediaStore.Images.Media.EXTERNAL_CONTENT_URI)。

选项3

最后，我建议使用下面的代码，它允许用户从任何图库应用程序中选择图像，而不会引起任何问题，也不会显示任何警告

Intent intent = new Intent ();
intent.setAction ( Intent.ACTION_PICK );
intent.setDataAndType ( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*" );
startActivityForResult ( intent, PICK_IMAGE_CODE );

public void FromCamera() {

    Log.i("camera", "startCameraActivity()");
    File file = new File(path);
    Uri outputFileUri = Uri.fromFile(file);
    Intent intent = new Intent(
            android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
    startActivityForResult(intent, 1);

}

public void FromCard() {
    Intent i = new Intent(Intent.ACTION_PICK,
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(i, 2);
}

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

    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == 2 && resultCode == RESULT_OK
            && null != data) {

        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        bitmap = BitmapFactory.decodeFile(picturePath);
        image.setImageBitmap(bitmap);

        if (bitmap != null) {
            ImageView rotate = (ImageView) findViewById(R.id.rotate);

        }

    } else {

        Log.i("SonaSys", "resultCode: " + resultCode);
        switch (resultCode) {
        case 0:
            Log.i("SonaSys", "User cancelled");
            break;
        case -1:
            onPhotoTaken();
            break;

        }

    }

}

protected void onPhotoTaken() {
    // Log message
    Log.i("SonaSys", "onPhotoTaken");
    taken = true;
    imgCapFlag = true;
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 4;
    bitmap = BitmapFactory.decodeFile(path, options);
    image.setImageBitmap(bitmap);


}

OnActivityResult方法已弃用

val singleImageResultLauncher =
            registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
                if (result.resultCode == Activity.RESULT_OK) {
                    // There are no request codes
                    val data: Intent? = result.data
                    val selectedImageUri: Uri? = data?.data
                    if (null != selectedImageUri) {
                        // Get the path from the Uri
                        val path = getPathFromURI(selectedImageUri)
                        findViewById<TextView>(R.id.textView).text = path
                        findViewById<ImageView>(R.id.imageView2).setImageURI(selectedImageUri)
                    }
                }
            }

findViewById<Button>(R.id.oneImageSelectBtn).setOnClickListener {
            val intent = Intent()
            intent.type = "image/*"
            intent.action = Intent.ACTION_GET_CONTENT
            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, false)
            singleImageResultLauncher.launch(Intent.createChooser(intent, "Select Picture"))

        }

private fun getPathFromURI(uri: Uri?): String {
        var path = ""
        if (contentResolver != null) {
            val cursor = contentResolver.query(uri!!, null, null, null, null)
            if (cursor != null) {
                cursor.moveToFirst()
                val idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DISPLAY_NAME)
                path = cursor.getString(idx)
                cursor.close()
            }
        }
        return path
}