<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

 package com.dragon.android.permissionrequest;

 import android.Manifest;

 import android.content.DialogInterface;

 import android.content.Intent;

 import android.content.pm.PackageManager;

 import android.net.Uri;

 import android.os.Build;

 import android.os.Bundle;

 import android.provider.Settings;

 import android.support.annotation.NonNull;

 import android.support.v4.app.ActivityCompat;

 import android.support.v4.content.ContextCompat;

 import android.support.v7.app.AlertDialog;

 import android.support.v7.app.AppCompatActivity;

 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {

     // 要申请的权限

     private String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};

     private AlertDialog dialog;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         // 版本判断。当手机系统大于 23 时，才有必要去判断权限是否获取

         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

             // 检查该权限是否已经获取

             int i = ContextCompat.checkSelfPermission(this, permissions[0]);

             // 权限是否已经 授权 GRANTED---授权  DINIED---拒绝

             if (i != PackageManager.PERMISSION_GRANTED) {

                 // 如果没有授予该权限，就去提示用户请求

                 showDialogTipUserRequestPermission();

             }

         }

     }

     // 提示用户该请求权限的弹出框

     private void showDialogTipUserRequestPermission() {

         new AlertDialog.Builder(this)

                 .setTitle("存储权限不可用")

                 .setMessage("由于支付宝需要获取存储空间，为你存储个人信息；\n否则，您将无法正常使用支付宝")

                 .setPositiveButton("立即开启", new DialogInterface.OnClickListener() {

                     @Override

                     public void onClick(DialogInterface dialog, int which) {

                         startRequestPermission();

                     }

                 })

                 .setNegativeButton("取消", new DialogInterface.OnClickListener() {

                     @Override

                     public void onClick(DialogInterface dialog, int which) {

                         finish();

                     }

                 }).setCancelable(false).show();

     }

     // 开始提交请求权限

     private void startRequestPermission() {

         ActivityCompat.requestPermissions(this, permissions, 321);

     }

     // 用户权限 申请 的回调方法

     @Override

     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

         super.onRequestPermissionsResult(requestCode, permissions, grantResults);

         if (requestCode == 321) {

             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

                 if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {

                     // 判断用户是否 点击了不再提醒。(检测该权限是否还可以申请)

                     boolean b = shouldShowRequestPermissionRationale(permissions[0]);

                     if (!b) {

                         // 用户还是想用我的 APP 的

                         // 提示用户去应用设置界面手动开启权限

                         showDialogTipUserGoToAppSettting();

                     } else

                         finish();

                 } else {

                     Toast.makeText(this, "权限获取成功", Toast.LENGTH_SHORT).show();

                 }

             }

         }

     }

     // 提示用户去应用设置界面手动开启权限

     private void showDialogTipUserGoToAppSettting() {

         dialog = new AlertDialog.Builder(this)

                 .setTitle("存储权限不可用")

                 .setMessage("请在-应用设置-权限-中，允许支付宝使用存储权限来保存用户数据")

                 .setPositiveButton("立即开启", new DialogInterface.OnClickListener() {

                     @Override

                     public void onClick(DialogInterface dialog, int which) {

                         // 跳转到应用设置界面

                         goToAppSetting();

                     }

                 })

                 .setNegativeButton("取消", new DialogInterface.OnClickListener() {

                     @Override

                     public void onClick(DialogInterface dialog, int which) {

                         finish();

                     }

                 }).setCancelable(false).show();

     }

     // 跳转到当前应用的设置界面

     private void goToAppSetting() {

         Intent intent = new Intent();

         intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);

         Uri uri = Uri.fromParts("package", getPackageName(), null);

         intent.setData(uri);

         startActivityForResult(intent, 123);

     }

     //

     @Override

     protected void onActivityResult(int requestCode, int resultCode, Intent data) {

         super.onActivityResult(requestCode, resultCode, data);

         if (requestCode == 123) {

             if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

                 // 检查该权限是否已经获取

                 int i = ContextCompat.checkSelfPermission(this, permissions[0]);

                 // 权限是否已经 授权 GRANTED---授权  DINIED---拒绝

                 if (i != PackageManager.PERMISSION_GRANTED) {

                     // 提示用户应该去应用设置界面手动开启权限

                     showDialogTipUserGoToAppSettting();

                 } else {

                     if (dialog != null && dialog.isShowing()) {

                         dialog.dismiss();

                     }

                     Toast.makeText(this, "权限获取成功", Toast.LENGTH_SHORT).show();

                 }

             }

         }

     }

 }