Android 权限问题

权限问题--在此记录一下：

private void getPermission(){
        //做权限列表
        List<String> permissionList = new ArrayList<>();
        if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.INTERNET)
                !=  PackageManager.PERMISSION_GRANTED){
            permissionList.add(Manifest.permission.INTERNET);
        }
        if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE)
                !=  PackageManager.PERMISSION_GRANTED){
            permissionList.add(Manifest.permission.READ_EXTERNAL_STORAGE);
        }
        if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                !=  PackageManager.PERMISSION_GRANTED){
            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        //如果权限列表为空----代表全被授权---否则就回调
        if(!permissionList.isEmpty()){
            String[] permissions = permissionList.toArray(new String[permissionList.size()]);
            ActivityCompat.requestPermissions(MainActivity.this, permissions, 1);
        }
        else{
            //如果为空--说明第一次有授权了--这次就不需要授权了，就开始进行服务
            startMethods();
        }
    }
    //权限问题--检查
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //返回值的检查
        switch (requestCode){
            case 1:
                //如果不为空说明有权限需要处理
                if(grantResults.length>0){
                    for(int result:grantResults){
                        if(result!=PackageManager.PERMISSION_GRANTED){
                            Toast.makeText(this, "必须全部授权才能继续使用", Toast.LENGTH_SHORT).show();
                            finish();
                            return;
                        }
                    }
                    startMethods();
                }else{
                    Toast.makeText(this, "未知错误", Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
            default:
                break;
        }
    }