运行时权限

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="match_parent"
      android:layout_height="wrap_content"
      android:text="打电话"
      />

</LinearLayout>

package com.example.runtimepermissiontest;

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.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";

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

        Button makeCall = (Button) findViewById(R.id.make_call);
        makeCall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try {

                    if (ActivityCompat.checkSelfPermission(MainActivity.this,
                            Manifest.permission.CALL_PHONE)
                            != PackageManager.PERMISSION_GRANTED) {

                        ActivityCompat.requestPermissions(
                                MainActivity.this, new String[]{
                                        Manifest.permission.CALL_PHONE
                                }, 1

                        );

                    } else {
                        call();
                    }

                } catch (Exception e) {

                    e.printStackTrace();
                }
            }
        });

    }

    private void call() {
        try {
            Intent intent = new Intent(Intent.ACTION_CALL);
            intent.setData(Uri.parse("tel:10086"));
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                return;
            }else{
                Log.d(TAG, "call: 有权限打电话");
                startActivity(intent);
            }

        } catch (Exception e) {

            e.printStackTrace();
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] ==
                        PackageManager.PERMISSION_GRANTED
                        ) {
                    call();
                } else {
                    Toast.makeText(this, "你拒绝了电话权限", Toast.LENGTH_LONG).show();
                }
                break;
            default:

        }
//        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}