<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.example.runtimepermissiontest.MainActivity">

 
 <Button
 android:id="@+id/make_call"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Make Call"
 android:textAllCaps="false"/>

</android.support.constraint.ConstraintLayout>

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Button makeCall = findViewById(R.id.make_call);
 makeCall.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
  try {
   Intent intent = new Intent(Intent.ACTION_CALL);
   intent.setData(Uri.parse("tel:10000"));
   startActivity(intent);
  }catch (SecurityException e){
   e.printStackTrace();
  }
  }
 });
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.runtimepermissiontest">

 <uses-permission android:name="android.permission.CALL_PHONE" />
 
 <application
 android:allowBackup="true"
 android:icon="@mipmap/ic_launcher"
 android:label="@string/app_name"
 android:roundIcon="@mipmap/ic_launcher_round"
 android:supportsRtl="true"
 android:theme="@style/AppTheme">
 <activity android:name=".MainActivity">
  <intent-filter>
  <action android:name="android.intent.action.MAIN" />

  <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
 </activity>
 </application>

</manifest>

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Button makeCall = findViewById(R.id.make_call);
 makeCall.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
  if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED){
   ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.CALL_PHONE},1);
  }else {
   call();
  }
  }
 });
 }
 
 private void call(){
 try {
  Intent intent = new Intent(Intent.ACTION_CALL);
  intent.setData(Uri.parse("tel:10000"));
  startActivity(intent);
 }catch (SecurityException e){
  e.printStackTrace();
 }
 }

 @Override
 public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
 switch (requestCode){
  case 1:
  if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
   call();
  }else {
   Toast.makeText(this,"You denied the permission",Toast.LENGTH_SHORT).show();
  }
  break;
  default:
   break;
 }
 }
}