Android 关于9.0版本之后相机权限问题

 权限有三种状态

1.用户已经同意该权限

2.用户拒绝了该权限，没有选中『不再询问』（Never ask again）,那么下次再次启动时，还会提示请求权限的对话框

3.用户拒绝了该权限，并且选中『不再询问』，提醒用户手动打开权限

所以第三种，就是没有权限，也不会给你弹出系统权限

这是一个调取系统相机和使用知乎源码调取相册的方法：

//知乎 调用系统相册 api 'com.zhihu.android:matisse:0.5.0-alpha4'

//相机
    public void getphoto() {
        PictureDialog pictureDialog = new PictureDialog();
        pictureDialog.setOnPersonalListener(new PictureDialog.OnPersonalListener() {
            @Override
            public void onTop() {
                File file = new File(Environment.getExternalStorageDirectory().getPath() + "/" + System.currentTimeMillis() + ".jpg");
                imageuri = Uri.fromFile(file);

                //用于判断SDK版本是否大于23
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    //检查权限
                    int i = ContextCompat.checkSelfPermission(getContext(), PERMISSIONS_STORAGE[0]);//0表示读写权限
                    int i2 = ContextCompat.checkSelfPermission(getContext(), PERMISSIONS_STORAGE[1]);//1表示照相权限
                    //如果权限申请失败，则重新申请权限
                    if (i == PackageManager.PERMISSION_DENIED && i2 == PackageManager.PERMISSION_DENIED) {//-1没授权
                        //重新申请权限函数
                        startRequestPermission();
                        Logger.e("权限请求成功");
                    } else if (i == PackageManager.PERMISSION_GRANTED && i2 == PackageManager.PERMISSION_GRANTED) {//0授权
                        PictureUtils.takePicture(CameraEvoActivity.this, imageuri, 4001);
                    } else {
                        HintTitleDialog myDialog = new HintTitleDialog("需要到系统中设置相关权限");
                        myDialog.show(getSupportFragmentManager());
                        myDialog.setOnLeftClick(new HintDialog.OnLeftClick() {
                            @Override
                            public void onLeft() {
                                ToastUtils.show("取消");
                            }
                        });
                        myDialog.setOnRightClick(new HintDialog.OnRightClick() {
                            @Override
                            public void onRight() {
                                myDialog.dismiss();
                                startAppDetailSetting(CameraEvoActivity.this, 101);
                            }
                        });
                    }
                } else {
                    PictureUtils.takePicture(CameraEvoActivity.this, imageuri, 4001);
                }
            }

            @Override
            public void onBottom() {
                Matisse.from(CameraEvoActivity.this)
                        .choose(MimeType.of(MimeType.JPEG, MimeType.PNG)) // 选择 mime 的类型
                        .theme(R.style.Matisse_Dracula)//Zhihu（亮蓝色主题） Dracula（黑色主题）
                        .countable(true)
                        .maxSelectable(1) // 图片选择的最多数量
                        .spanCount(3)//网格的规格
                        .restrictOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED)//图像选择和预览活动所需的方向。
                        .thumbnailScale(0.85f) // 缩略图的比例
                        .imageEngine(new GlideEngine()) // 使用的图片加载引擎
                        .forResult(5001); // 设置作为标记的请求码
            }
        }).show(getSupportFragmentManager());
    }

    /**
     * 获取应用详情页面intent
     */
    public static void startAppDetailSetting(Activity context, int request) {
        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        Uri uri = Uri.fromParts("package", context.getPackageName(), null);
        intent.setData(uri);
        context.startActivityForResult(intent, request);
    }

    //重新申请权限函数
    private void startRequestPermission() {
        //4001为请求码
        ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, 4001);
    }

    //请求权限时的回调方法
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //检查权限
        int i = ContextCompat.checkSelfPermission(getContext(), PERMISSIONS_STORAGE[0]);
        int i2 = ContextCompat.checkSelfPermission(getContext(), PERMISSIONS_STORAGE[1]);
        //如果权限申请失败，则重新申请权限
        if (i == PackageManager.PERMISSION_DENIED && i2 == PackageManager.PERMISSION_DENIED) {//-1没授权
            //重新申请权限函数
            startRequestPermission();
            Logger.e("权限请求成功");
        } else if (i == PackageManager.PERMISSION_GRANTED && i2 == PackageManager.PERMISSION_GRANTED) {//0授权
            PictureUtils.takePicture(CameraEvoActivity.this, imageuri, 4001);
        } else {
            HintTitleDialog myDialog = new HintTitleDialog("需要到系统中设置相关权限");
            myDialog.show(getSupportFragmentManager());
            myDialog.setOnLeftClick(new HintDialog.OnLeftClick() {
                @Override
                public void onLeft() {
                    ToastUtils.show("取消");
                }
            });
            myDialog.setOnRightClick(new HintDialog.OnRightClick() {
                @Override
                public void onRight() {
                    myDialog.dismiss();
                    startAppDetailSetting(CameraEvoActivity.this, 101);
                }
            });
        }
    }

    //回传值
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 4001 && resultCode == RESULT_OK) {
            imgPhotoNo.setVisibility(View.GONE);
            imgPhoto.setVisibility(View.VISIBLE);
            ivDeleteMed.setVisibility(View.VISIBLE);
            headUri = getRealFilePath(imageuri);
            GlideUtil.load(getContext(), headUri, imgPhoto);
        } else if (requestCode == 5001 && resultCode == RESULT_OK) {
            imgPhotoNo.setVisibility(View.GONE);
            imgPhoto.setVisibility(View.VISIBLE);
            ivDeleteMed.setVisibility(View.VISIBLE);
            if (Matisse.obtainPathResult(data).size() != 0 && Matisse.obtainPathResult(data) != null) {
                headUri = Matisse.obtainPathResult(data).get(0);
            }
            GlideUtil.load(getContext(), headUri, imgPhoto);
        }
    }

    /**
     * 获取uri真实路径
     */
    public static String getRealFilePath(final Uri uri) {
        String path = uri.getPath();
        String data = path.replace("external_files", Environment.getExternalStorageDirectory().getPath());
        Logger.d("获取uri真实路径: \nuri:" + path + "\npath:" + data);
        return data;
    }

第二种：就是在整个应用APP进入之前 就把权限设置好 同意则进入APP主页面
依赖权限：implementation 'com.blankj:utilcode:1.25.9'

GitHub网址：https://github.com/Blankj/AndroidUtilCode/blob/master/lib/utilcode/README-CN.md

在引导页加入：

//判断是否授权 phone电话权限 STORAGE读写权限 CAMERA照相权限
        if (!PermissionUtils.isGranted(PermissionConstants.PHONE, PermissionConstants.STORAGE, PermissionConstants.CAMERA)) {
            //设置请求权限
            PermissionUtils.permission(PermissionConstants.PHONE, PermissionConstants.STORAGE, PermissionConstants.CAMERA).callback(new PermissionUtils.SimpleCallback() {
                @Override
                public void onGranted() {
                    Log.d("WelcomeActivity", "权限已申请");
                }

                @Override
                public void onDenied() {
                    AppUtils.exitApp();
                }
            }).request();
        }else{
            //进行相关操作
        }

application中权限初始化：

//权限初始化
MultiDex.install(context);