请求权限对话框将应用程序发送到后台

Question

我有“发送短信”按钮，应用程序会在其中请求用户 SEND_SMS 许可，然后发送短信。但是，当我单击“发送短信”按钮时，应用程序将发送到后台，并且主屏幕上会显示权限请求对话框。当我单击“允许”并返回应用程序时，我已自动导航到应用程序的主页片段。无论如何，如果我返回带有“发送短信”按钮的片段，我将无法发送短信。（因此权限授予被保留。）我的代码如下所示

在AndroidManifest.xml我有

<uses-permission android:name="android.permission.SEND_SMS" />

在MainActivity.kt

 fun requestSendSmsPermission() {

        if (ActivityCompat.shouldShowRequestPermissionRationale(
                this,
                Manifest.permission.SEND_SMS
            )
        ) {
            android.app.AlertDialog.Builder(this)
            .setTitle("Permission Request")
            .setMessage("Reason for permission request")
            .setPositiveButton("ok"
            ) { _, _ ->
                ActivityCompat.requestPermissions(
                    this@MainActivity,
                    arrayOf(Manifest.permission.SEND_SMS),
                    SEND_SMS_PERMISSION_CODE
                )
                sendSMS()
            }
            .setNegativeButton("cancel"
            ) { dialog, _ -> dialog.dismiss() }
            .create().show()
        } else {
            ActivityCompat.requestPermissions(
                this,
                arrayOf(Manifest.permission.SEND_SMS),
                SEND_SMS_PERMISSION_CODE
            )
            sendSMS()
        }

    }

    private fun sendSMS(){
        val emergencyContactNo = "1234567890"
        val messageBody =
            "hello there"
        val smsManager: SmsManager = SmsManager.getDefault()
        smsManager.sendTextMessage(emergencyContactNo, null, messageBody, null, null)
        Toast.makeText(this, "Message Sent", Toast.LENGTH_LONG).show()
    }


  override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<String?>,
        grantResults: IntArray
    ) {
        if (requestCode == SEND_SMS_PERMISSION_CODE) {
            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "Permission GRANTED", Toast.LENGTH_SHORT).show()
                sendSMS()

            } else {
                Toast.makeText(this, "Permission DENIED", Toast.LENGTH_SHORT).show()
            }
        }
    }

短信发送片段我有

mainActivity = activity as MainActivity

binding.btnSms.setOnClickListener {
     mainActivity.requestSendSmsPermission()
}

我尝试了什么？

我尝试在新项目上使用相同的代码，但效果很好。但在我的项目我正在使用导航架构组件。

对我来说，问题似乎出在导航组件和权限对话框的组合上。那么我该如何使用导航组件的运行时权限呢？

Answer 1

原因是您遇到 java.lang.SecurityException: Sending SMS message: does not have android.permission.SEND_SMS 崩溃。

因为您在请求权限后同步调用 sendSms。您必须等待授予权限，或者如果它已经立即授予呼叫 sendSms。

在授予权限之前删除所有 sendSms 调用。查看 Basic Sample.

fun requestSendSmsPermission() {
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.SEND_SMS)) {
        android.app.AlertDialog.Builder(this)
            .setTitle("Permission Request")
            .setMessage("Reason for permission request")
            .setPositiveButton("ok"
            ) { _, _ ->
                ActivityCompat.requestPermissions(
                    this@MainActivity,
                    arrayOf(Manifest.permission.SEND_SMS),
                    SEND_SMS_PERMISSION_CODE
                )
            }
            .setNegativeButton("cancel"
            ) { dialog, _ -> dialog.dismiss() }
            .create().show()
    } else {
        ActivityCompat.requestPermissions(
            this,
            arrayOf(Manifest.permission.SEND_SMS),
            SEND_SMS_PERMISSION_CODE
        )
    }
}

请求权限对话框将应用程序发送到后台

Request permission dialog send app to the background

android

android-permissions