MainActivity.java

package com.mcxtzhang.permissiondemo;

import android.Manifest;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "zxt";

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


/*
        getWindow().getDecorView().postDelayed(new Runnable() {
            @Override
            public void run() {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.READ_CONTACTS}, 101);
            }
        }, 5000);
*/

        ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.READ_CONTACTS}, 101);

        startActivity(new Intent(this, Main2Activity.class));
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        Log.d(TAG, "onRequestPermissionsResult() called with: requestCode = [" + requestCode + "], permissions = [" + permissions + "], grantResults = [" + grantResults[0] + "]");
    }
}