无法在Android Webview中上载图片

我已经在Webview中加载了我的网站。在我的网站上，有一个上传图片和录制音频的选项。我已经添加了录制音频、读取和写入外部存储权限，但它仍然不起作用。我还需要做些什么才能做到这一点？有人能帮我吗

class SplashActivity : AppCompatActivity() {

private val SPLASH_DISPLAY_LENGTH: Long = 3000
private val PERMISSION_ALL = 1

var PERMISSIONS = arrayOf(
    Manifest.permission.RECORD_AUDIO,
    Manifest.permission.READ_EXTERNAL_STORAGE,
    Manifest.permission.WRITE_EXTERNAL_STORAGE
)

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_splash)

    Handler().postDelayed({
        for (permission in PERMISSIONS) {
            if (ActivityCompat.checkSelfPermission(
                    this@SplashActivity,
                    permission
                ) == PackageManager.PERMISSION_GRANTED
            ) {
                val intent = Intent(this@SplashActivity, HomeActivity::class.java)
                startActivity(intent)
                finish()
            } else {
                requestPermissions()
            }
        }
    }, SPLASH_DISPLAY_LENGTH)
}

请求录制音频、读取和写入外部存储权限

private fun requestPermissions() {
    ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_ALL)
}

override fun onRequestPermissionsResult(
    requestCode: Int,
    permissions: Array<String?>,
    grantResults: IntArray
) {
    if (requestCode == PERMISSION_ALL) {
        if (grantResults.size > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            val intent = Intent(this@SplashActivity, HomeActivity::class.java)
            startActivity(intent)
            finish()
        } else {
            if (ActivityCompat.shouldShowRequestPermissionRationale(
                    this,
                    Manifest.permission.RECORD_AUDIO
                ) || ActivityCompat.shouldShowRequestPermissionRationale(
                    this,
                    Manifest.permission.READ_EXTERNAL_STORAGE
                )
                || ActivityCompat.shouldShowRequestPermissionRationale(
                    this,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE
                )
            ) {
                AlertDialog.Builder(this)
                    .setTitle("Message")
                    .setMessage("All permissions are required for this app.")
                    .setPositiveButton(
                        "ok"
                    ) { dialog, which ->
                        ActivityCompat.requestPermissions(
                            this@SplashActivity,
                            PERMISSIONS, PERMISSION_ALL
                        )
                    }
                    .setNegativeButton(
                        "cancel"
                    ) { dialog, which -> finish() }
                    .create().show()
            }
        }
    }
}
}

private-fun-requestPermissions（）{
ActivityCompat.requestPermissions（此、权限、权限\全部）
}
覆盖onRequestPermissionsResult(
请求代码：Int，
权限：数组，
格兰特结果：因塔雷
) {
if（requestCode==权限\全部）{
if（grantResults.size>0&&grantResults[0]==PackageManager.PERMISSION\u已授予）{
val intent=intent(this@SplashActivity，HomeActivity:：class.java）
星触觉（意图）
完成（）
}否则{
如果（ActivityCompat.shouldShowRequestPermissionRegulation）(
这
Manifest.permission.RECORD\u音频
)| | ActivityCompat.shouldShowRequestPermission基本原理(
这
Manifest.permission.READ\u外部存储
)
||ActivityCompat.shouldShowRequestPermission基本原理(
这
Manifest.permission.WRITE\u外部存储
)
) {
AlertDialog.Builder（此）
.setTitle（“消息”）
.setMessage（“此应用程序需要所有权限。”）
.setPositiveButton(
“好的”
){对话框，其中->
ActivityCompat.requestPermissions(
this@SplashActivity,
权限，权限\u全部
)
}
.setNegativeButton(
“取消”
){对话框，其中->完成（）
.create（）.show（）
}
}
}
}
}