如何在每次发送短信时修复“显示权限对话框”？

Question

我想通过android-应用程序发送短信，但是每次发送消息之前都会显示许可对话框，在第一次请求许可后，我应该发送一条没有对话框显示的消息。

我的android应用程序运行在mi-8上，目标SDK-版本是29。

if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.SEND_SMS) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.SEND_SMS}, 3);
} else if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_PHONE_STATE}, 4);
} else {
    sendMsg();
}

我希望权限对话框在第一次请求权限后发送消息时没有显示，而是每次发送消息时实际显示对话框。

Answer 1

使用此函数检查您是否已给予许可，如果您已按要求给予许可，它将返回真标志。

检查这边

   private boolean checkAndRequestPermissions(){

        //add as much as permission you need
        int readSMS = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_SMS);
        int sendSms = ContextCompat.checkSelfPermission(this, Manifest.permission.SEND_SMS);

        List<String> listPermissionsNeeded = new ArrayList<>();

        if (readSMS != PackageManager.PERMISSION_GRANTED) {
            listPermissionsNeeded.add(Manifest.permission.READ_SMS);
        }
        if (receiveSms != PackageManager.PERMISSION_GRANTED) {
            listPermissionsNeeded.add(Manifest.permission.RECEIVE_SMS);
        }
        if (!listPermissionsNeeded.isEmpty()) {
            ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]),
                    REQUEST_ID_MULTIPLE_PERMISSIONS);
            return false;
        }
        return true;
    }

通过这种方式检查

 if (checkAndRequestPermissions()){
        sendMsg();
    }else{
      //do what you want  
    }

不需要用硬编码的方式