把这段代码添加到MainActivity.java的onCreate()方法中

if(Build.VERSION.SDK_INT>=23){
            if (checkSelfPermission(Manifest.permission.PROCESS_OUTGOING_CALLS)!= PackageManager.PERMISSION_GRANTED){
                requestPermissions(new String[]{Manifest.permission.PROCESS_OUTGOING_CALLS},0);
            }
        }

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