<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
>
<Button
    android:id="@+id/btn_dial"
    android:text="Dial"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<Button
    android:id="@+id/call"
    android:text="call"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

</LinearLayout>

package com.cnblogs.dialandcall;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_dial;
    private Button btn_call;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn_call = (Button)findViewById(R.id.btn_call);
        btn_call.setOnClickListener(this);

        btn_dial = (Button)findViewById(R.id.btn_dial);
        btn_dial.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btn_call:
                onCall();
                break;
            case R.id.btn_dial:
                Intent dialIntent = new Intent(Intent.ACTION_DIAL);
                dialIntent.setData(Uri.parse("tel:10086"));
                startActivity(dialIntent);
                break;
        }
    }

    private void onCall() {
        int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE);
        if(permissionCheck!= PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CALL_PHONE}, Integer.parseInt("001"));
        }
        else{
            startActivity(new Intent(Intent.ACTION_CALL).setData(Uri.parse("tel:10086")));
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case 001:
                if(grantResults.length>0&&(grantResults[0]==PackageManager.PERMISSION_GRANTED)){
                    onCall();
                }
                else {
                    Toast.makeText(getBaseContext(),"You Need Allow The Permission To Run This App",Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
}