Androis 短信权限

Question

每次用户按下按钮时，我都想检查短信发送权限。 如果授予权限，则应用程序应发送短信，但如果权限被拒绝，我想再次显示权限对话框，以便用户授予权限。 我的问题如下：如果用户被拒绝权限，我的应用程序不会再次显示对话框。 我使用以下代码。 有什么帮助吗？

package com.example.lockdownsms.ui.home

import android.Manifest
import android.content.pm.PackageManager
import android.os.Build
import android.os.Bundle
import android.telephony.SmsManager
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import androidx.core.app.ActivityCompat
import androidx.fragment.app.Fragment
import androidx.lifecycle.ViewModelProvider
import com.example.lockdownsms.R


class HomeFragment : Fragment() {

    private lateinit var homeViewModel: HomeViewModel

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        homeViewModel =
                ViewModelProvider(this).get(HomeViewModel::class.java)
        val root = inflater.inflate(R.layout.fragment_home, container, false)
       /* val textView: TextView = root.findViewById(R.id.text_home)
        homeViewModel.text.observe(viewLifecycleOwner, Observer {
            textView.text = it
        })*/

        val sms1 = root.findViewById<Button>(R.id.button1)
        sms1.setOnClickListener {

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (getContext()?.let { it1 -> ActivityCompat.checkSelfPermission(it1, Manifest.permission.SEND_SMS)} != PackageManager.PERMISSION_GRANTED) {
                    requestPermissions(Array<String>(1) { android.Manifest.permission.SEND_SMS }, 100);
                } else {
                    val smsManager: SmsManager = SmsManager.getDefault()
                    smsManager.sendTextMessage("13033", null, "msg", null, null)
                }

            }else {
                val smsManager: SmsManager = SmsManager.getDefault()
                smsManager.sendTextMessage("13033", null, "msg", null, null)
            }
        }
        return root
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        //super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == 100) {
            if (permissions[0].equals(Manifest.permission.SEND_SMS) && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                val smsManager: SmsManager = SmsManager.getDefault()
                smsManager.sendTextMessage("13033", null, "msg", null, null)
            }

        }
    }


}

Answer 1

这就是您在 Activity 中需要做的所有事情。

请注意，如果您想在Fragment中使用此代码段，请执行以下操作。

• checkSelfPermission()更改为ActivityCompact.checkSelfPermission()

并将ActivityCompat.requestPermissions()更改为requestPermissions()

Permission 结果（Allow 或 Deny）的处理与 Activity 相同。

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

 public static final int MY_PERMISSIONS_SEND_SMS = 1;

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnCheckSMSPermission.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();
        switch (id) {
            case R.id.btnCheckSMSPermission:
                checkSMSPermission();
                break;
                   }
}


 void checkSMSPermission() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.SEND_SMS) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.SEND_SMS}, MY_PERMISSIONS_SEND_SMS);
        }

    }



  @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_SEND_SMS: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // permission was granted, yay! Do the
                    
                    Toast.makeText(getApplicationContext(), "SEND_SMS granted", Toast.LENGTH_SHORT).show();
                } else {
                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(getApplicationContext(), "SEND_SMS denied", Toast.LENGTH_SHORT).show();
                }
                return;

            }

      }


    }