Delphi 10.3 RIO发布近两个月，针对Google Play的要求，完美实现了对Android 8的支持，即对Android API Level 26的支持。这支持当中，最主要的得算是动态申请应用权限，现在我们来看看，如何在自己的app中动态申请权限？

下面的代码，是10.3封装的Android权限列表，这些权限，我们都可以动态申请。

    {class} property ACCESS_CHECKIN_PROPERTIES: JString read _GetACCESS_CHECKIN_PROPERTIES;

    {class} property ACCESS_COARSE_LOCATION: JString read _GetACCESS_COARSE_LOCATION;

    {class} property ACCESS_FINE_LOCATION: JString read _GetACCESS_FINE_LOCATION;

    {class} property ACCESS_LOCATION_EXTRA_COMMANDS: JString read _GetACCESS_LOCATION_EXTRA_COMMANDS;

    {class} property ACCESS_NETWORK_STATE: JString read _GetACCESS_NETWORK_STATE;

    {class} property ACCESS_NOTIFICATION_POLICY: JString read _GetACCESS_NOTIFICATION_POLICY;

    {class} property ACCESS_WIFI_STATE: JString read _GetACCESS_WIFI_STATE;

    {class} property ACCOUNT_MANAGER: JString read _GetACCOUNT_MANAGER;

    {class} property ADD_VOICEMAIL: JString read _GetADD_VOICEMAIL;

    {class} property ANSWER_PHONE_CALLS: JString read _GetANSWER_PHONE_CALLS;

    {class} property BATTERY_STATS: JString read _GetBATTERY_STATS;

    {class} property BIND_ACCESSIBILITY_SERVICE: JString read _GetBIND_ACCESSIBILITY_SERVICE;

    {class} property BIND_APPWIDGET: JString read _GetBIND_APPWIDGET;

    {class} property BIND_AUTOFILL_SERVICE: JString read _GetBIND_AUTOFILL_SERVICE;

    {class} property BIND_CARRIER_MESSAGING_SERVICE: JString read _GetBIND_CARRIER_MESSAGING_SERVICE;

    {class} property BIND_CARRIER_SERVICES: JString read _GetBIND_CARRIER_SERVICES;

    {class} property BIND_CHOOSER_TARGET_SERVICE: JString read _GetBIND_CHOOSER_TARGET_SERVICE;

    {class} property BIND_CONDITION_PROVIDER_SERVICE: JString read _GetBIND_CONDITION_PROVIDER_SERVICE;

    {class} property BIND_DEVICE_ADMIN: JString read _GetBIND_DEVICE_ADMIN;

    {class} property BIND_DREAM_SERVICE: JString read _GetBIND_DREAM_SERVICE;

    {class} property BIND_INCALL_SERVICE: JString read _GetBIND_INCALL_SERVICE;

    {class} property BIND_INPUT_METHOD: JString read _GetBIND_INPUT_METHOD;

    {class} property BIND_MIDI_DEVICE_SERVICE: JString read _GetBIND_MIDI_DEVICE_SERVICE;

    {class} property BIND_NFC_SERVICE: JString read _GetBIND_NFC_SERVICE;

    {class} property BIND_NOTIFICATION_LISTENER_SERVICE: JString read _GetBIND_NOTIFICATION_LISTENER_SERVICE;

    {class} property BIND_PRINT_SERVICE: JString read _GetBIND_PRINT_SERVICE;

    {class} property BIND_QUICK_SETTINGS_TILE: JString read _GetBIND_QUICK_SETTINGS_TILE;

    {class} property BIND_REMOTEVIEWS: JString read _GetBIND_REMOTEVIEWS;

    {class} property BIND_SCREENING_SERVICE: JString read _GetBIND_SCREENING_SERVICE;

    {class} property BIND_TELECOM_CONNECTION_SERVICE: JString read _GetBIND_TELECOM_CONNECTION_SERVICE;

    {class} property BIND_TEXT_SERVICE: JString read _GetBIND_TEXT_SERVICE;

    {class} property BIND_TV_INPUT: JString read _GetBIND_TV_INPUT;

    {class} property BIND_VISUAL_VOICEMAIL_SERVICE: JString read _GetBIND_VISUAL_VOICEMAIL_SERVICE;

    {class} property BIND_VOICE_INTERACTION: JString read _GetBIND_VOICE_INTERACTION;

    {class} property BIND_VPN_SERVICE: JString read _GetBIND_VPN_SERVICE;

    {class} property BIND_VR_LISTENER_SERVICE: JString read _GetBIND_VR_LISTENER_SERVICE;

    {class} property BIND_WALLPAPER: JString read _GetBIND_WALLPAPER;

    {class} property BLUETOOTH: JString read _GetBLUETOOTH;

    {class} property BLUETOOTH_ADMIN: JString read _GetBLUETOOTH_ADMIN;

    {class} property BLUETOOTH_PRIVILEGED: JString read _GetBLUETOOTH_PRIVILEGED;

    {class} property BODY_SENSORS: JString read _GetBODY_SENSORS;

    {class} property BROADCAST_PACKAGE_REMOVED: JString read _GetBROADCAST_PACKAGE_REMOVED;

    {class} property BROADCAST_SMS: JString read _GetBROADCAST_SMS;

    {class} property BROADCAST_STICKY: JString read _GetBROADCAST_STICKY;

    {class} property BROADCAST_WAP_PUSH: JString read _GetBROADCAST_WAP_PUSH;

    {class} property CALL_PHONE: JString read _GetCALL_PHONE;

    {class} property CALL_PRIVILEGED: JString read _GetCALL_PRIVILEGED;

    {class} property CAMERA: JString read _GetCAMERA;

    {class} property CAPTURE_AUDIO_OUTPUT: JString read _GetCAPTURE_AUDIO_OUTPUT;

    {class} property CAPTURE_SECURE_VIDEO_OUTPUT: JString read _GetCAPTURE_SECURE_VIDEO_OUTPUT;

    {class} property CAPTURE_VIDEO_OUTPUT: JString read _GetCAPTURE_VIDEO_OUTPUT;

    {class} property CHANGE_COMPONENT_ENABLED_STATE: JString read _GetCHANGE_COMPONENT_ENABLED_STATE;

    {class} property CHANGE_CONFIGURATION: JString read _GetCHANGE_CONFIGURATION;

    {class} property CHANGE_NETWORK_STATE: JString read _GetCHANGE_NETWORK_STATE;

    {class} property CHANGE_WIFI_MULTICAST_STATE: JString read _GetCHANGE_WIFI_MULTICAST_STATE;

    {class} property CHANGE_WIFI_STATE: JString read _GetCHANGE_WIFI_STATE;

    {class} property CLEAR_APP_CACHE: JString read _GetCLEAR_APP_CACHE;

    {class} property CONTROL_LOCATION_UPDATES: JString read _GetCONTROL_LOCATION_UPDATES;

    {class} property DELETE_CACHE_FILES: JString read _GetDELETE_CACHE_FILES;

    {class} property DELETE_PACKAGES: JString read _GetDELETE_PACKAGES;

    {class} property DIAGNOSTIC: JString read _GetDIAGNOSTIC;

    {class} property DISABLE_KEYGUARD: JString read _GetDISABLE_KEYGUARD;

    {class} property DUMP: JString read _GetDUMP;

    {class} property EXPAND_STATUS_BAR: JString read _GetEXPAND_STATUS_BAR;

    {class} property FACTORY_TEST: JString read _GetFACTORY_TEST;

    {class} property GET_ACCOUNTS: JString read _GetGET_ACCOUNTS;

    {class} property GET_ACCOUNTS_PRIVILEGED: JString read _GetGET_ACCOUNTS_PRIVILEGED;

    {class} property GET_PACKAGE_SIZE: JString read _GetGET_PACKAGE_SIZE;

    {class} property GET_TASKS: JString read _GetGET_TASKS;

    {class} property GLOBAL_SEARCH: JString read _GetGLOBAL_SEARCH;

    {class} property INSTALL_LOCATION_PROVIDER: JString read _GetINSTALL_LOCATION_PROVIDER;

    {class} property INSTALL_PACKAGES: JString read _GetINSTALL_PACKAGES;

    {class} property INSTALL_SHORTCUT: JString read _GetINSTALL_SHORTCUT;

    {class} property INSTANT_APP_FOREGROUND_SERVICE: JString read _GetINSTANT_APP_FOREGROUND_SERVICE;

    {class} property INTERNET: JString read _GetINTERNET;

    {class} property KILL_BACKGROUND_PROCESSES: JString read _GetKILL_BACKGROUND_PROCESSES;

    {class} property LOCATION_HARDWARE: JString read _GetLOCATION_HARDWARE;

    {class} property MANAGE_DOCUMENTS: JString read _GetMANAGE_DOCUMENTS;

    {class} property MANAGE_OWN_CALLS: JString read _GetMANAGE_OWN_CALLS;

    {class} property MASTER_CLEAR: JString read _GetMASTER_CLEAR;

    {class} property MEDIA_CONTENT_CONTROL: JString read _GetMEDIA_CONTENT_CONTROL;

    {class} property MODIFY_AUDIO_SETTINGS: JString read _GetMODIFY_AUDIO_SETTINGS;

    {class} property MODIFY_PHONE_STATE: JString read _GetMODIFY_PHONE_STATE;

    {class} property MOUNT_FORMAT_FILESYSTEMS: JString read _GetMOUNT_FORMAT_FILESYSTEMS;

    {class} property MOUNT_UNMOUNT_FILESYSTEMS: JString read _GetMOUNT_UNMOUNT_FILESYSTEMS;

    {class} property NFC: JString read _GetNFC;

    {class} property PACKAGE_USAGE_STATS: JString read _GetPACKAGE_USAGE_STATS;

    {class} property PERSISTENT_ACTIVITY: JString read _GetPERSISTENT_ACTIVITY;

    {class} property PROCESS_OUTGOING_CALLS: JString read _GetPROCESS_OUTGOING_CALLS;

    {class} property READ_CALENDAR: JString read _GetREAD_CALENDAR;

    {class} property READ_CALL_LOG: JString read _GetREAD_CALL_LOG;

    {class} property READ_CONTACTS: JString read _GetREAD_CONTACTS;

    {class} property READ_EXTERNAL_STORAGE: JString read _GetREAD_EXTERNAL_STORAGE;

    {class} property READ_FRAME_BUFFER: JString read _GetREAD_FRAME_BUFFER;

    {class} property READ_INPUT_STATE: JString read _GetREAD_INPUT_STATE;

    {class} property READ_LOGS: JString read _GetREAD_LOGS;

    {class} property READ_PHONE_NUMBERS: JString read _GetREAD_PHONE_NUMBERS;

    {class} property READ_PHONE_STATE: JString read _GetREAD_PHONE_STATE;

    {class} property READ_SMS: JString read _GetREAD_SMS;

    {class} property READ_SYNC_SETTINGS: JString read _GetREAD_SYNC_SETTINGS;

    {class} property READ_SYNC_STATS: JString read _GetREAD_SYNC_STATS;

    {class} property READ_VOICEMAIL: JString read _GetREAD_VOICEMAIL;

    {class} property REBOOT: JString read _GetREBOOT;

    {class} property RECEIVE_BOOT_COMPLETED: JString read _GetRECEIVE_BOOT_COMPLETED;

    {class} property RECEIVE_MMS: JString read _GetRECEIVE_MMS;

    {class} property RECEIVE_SMS: JString read _GetRECEIVE_SMS;

    {class} property RECEIVE_WAP_PUSH: JString read _GetRECEIVE_WAP_PUSH;

    {class} property RECORD_AUDIO: JString read _GetRECORD_AUDIO;

    {class} property REORDER_TASKS: JString read _GetREORDER_TASKS;

    {class} property REQUEST_COMPANION_RUN_IN_BACKGROUND: JString read _GetREQUEST_COMPANION_RUN_IN_BACKGROUND;

    {class} property REQUEST_COMPANION_USE_DATA_IN_BACKGROUND: JString read _GetREQUEST_COMPANION_USE_DATA_IN_BACKGROUND;

    {class} property REQUEST_DELETE_PACKAGES: JString read _GetREQUEST_DELETE_PACKAGES;

    {class} property REQUEST_IGNORE_BATTERY_OPTIMIZATIONS: JString read _GetREQUEST_IGNORE_BATTERY_OPTIMIZATIONS;

    {class} property REQUEST_INSTALL_PACKAGES: JString read _GetREQUEST_INSTALL_PACKAGES;

    {class} property RESTART_PACKAGES: JString read _GetRESTART_PACKAGES;

    {class} property SEND_RESPOND_VIA_MESSAGE: JString read _GetSEND_RESPOND_VIA_MESSAGE;

    {class} property SEND_SMS: JString read _GetSEND_SMS;

    {class} property SET_ALARM: JString read _GetSET_ALARM;

    {class} property SET_ALWAYS_FINISH: JString read _GetSET_ALWAYS_FINISH;

    {class} property SET_ANIMATION_SCALE: JString read _GetSET_ANIMATION_SCALE;

    {class} property SET_DEBUG_APP: JString read _GetSET_DEBUG_APP;

    {class} property SET_PREFERRED_APPLICATIONS: JString read _GetSET_PREFERRED_APPLICATIONS;

    {class} property SET_PROCESS_LIMIT: JString read _GetSET_PROCESS_LIMIT;

    {class} property SET_TIME: JString read _GetSET_TIME;

    {class} property SET_TIME_ZONE: JString read _GetSET_TIME_ZONE;

    {class} property SET_WALLPAPER: JString read _GetSET_WALLPAPER;

    {class} property SET_WALLPAPER_HINTS: JString read _GetSET_WALLPAPER_HINTS;

    {class} property SIGNAL_PERSISTENT_PROCESSES: JString read _GetSIGNAL_PERSISTENT_PROCESSES;

    {class} property STATUS_BAR: JString read _GetSTATUS_BAR;

    {class} property SYSTEM_ALERT_WINDOW: JString read _GetSYSTEM_ALERT_WINDOW;

    {class} property TRANSMIT_IR: JString read _GetTRANSMIT_IR;

    {class} property UNINSTALL_SHORTCUT: JString read _GetUNINSTALL_SHORTCUT;

    {class} property UPDATE_DEVICE_STATS: JString read _GetUPDATE_DEVICE_STATS;

    {class} property USE_FINGERPRINT: JString read _GetUSE_FINGERPRINT;

    {class} property USE_SIP: JString read _GetUSE_SIP;

    {class} property VIBRATE: JString read _GetVIBRATE;

    {class} property WAKE_LOCK: JString read _GetWAKE_LOCK;

    {class} property WRITE_APN_SETTINGS: JString read _GetWRITE_APN_SETTINGS;

    {class} property WRITE_CALENDAR: JString read _GetWRITE_CALENDAR;

    {class} property WRITE_CALL_LOG: JString read _GetWRITE_CALL_LOG;

    {class} property WRITE_CONTACTS: JString read _GetWRITE_CONTACTS;

    {class} property WRITE_EXTERNAL_STORAGE: JString read _GetWRITE_EXTERNAL_STORAGE;

    {class} property WRITE_GSERVICES: JString read _GetWRITE_GSERVICES;

    {class} property WRITE_SECURE_SETTINGS: JString read _GetWRITE_SECURE_SETTINGS;

    {class} property WRITE_SETTINGS: JString read _GetWRITE_SETTINGS;

    {class} property WRITE_SYNC_SETTINGS: JString read _GetWRITE_SYNC_SETTINGS;

    {class} property WRITE_VOICEMAIL: JString read _GetWRITE_VOICEMAIL

上面的代码，在Androidapi.JNI.Os单元，通过类TJManifest_permission可以得到名称，如下面的代码，取得相机的权限名称，存到FPermissionCamera字符串变量中。

  FPermissionCamera := JStringToString(TJManifest_permission.JavaClass.CAMERA);

为了在app运行期来申请对应的权限，10.3还实现了一个服务类：TPermissionsService，并且通过PermissionsService方法返回该类的实例，通过该实例的RequestPermissions方法申请权限：

  PermissionsService.RequestPermissions([FPermissionCamera, FPermissionReadExternalStorage, FPermissionWriteExternalStorage], TakePicturePermissionRequestResult, DisplayRationale);
RequestPermissions方法，功能如其名，申请权限。象上面的代码，要传递三个参数，先看一下这个方法的原型：
    procedure RequestPermissions(const APermissions: TArray<string>;

      const AOnRequestPermissionsResult: TRequestPermissionsResultEvent; AOnDisplayRationale: TDisplayRationaleEvent = nil);

      overload; virtual;
APermissions：权限名称数组，例如：[FPermissionCamera, FPermissionReadExternalStorage, FPermissionWriteExternalStorage]
AOnRequestPermissionsResult：TRequestPermissionsResultEvent，申请权限后触发的事件，我们要做一个TRequestPermissionsResultEvent函数，来接管动态申请后的逻辑。
AOnDisplayRationale: TDisplayRationaleEvent：例用这个事件，异步的向用户显示申请权限的解释说明，用户看到这个解释后，通过代码来支持用户来进一步请求权限。注意，千万不要阻止此线程等待用户的响应！
综上所述，我们现在可以看看实现动态申请app权限的代码步骤了：
1.声明app需要申请的权限名称变量
    //动态申请权限

    FPermissionCamera,

    FPermissionReadExternalStorage,

    FPermissionWriteExternalStorage: string;
2.在app启动时通过TJManifest_permission取得权限名称并赋值给权限名称变量
procedure TMainForm.FormCreate(Sender: TObject);

begin

{$IFDEF ANDROID}

  FPermissionCamera := JStringToString(TJManifest_permission.JavaClass.CAMERA);

  FPermissionReadExternalStorage := JStringToString(TJManifest_permission.JavaClass.READ_EXTERNAL_STORAGE);

  FPermissionWriteExternalStorage := JStringToString(TJManifest_permission.JavaClass.WRITE_EXTERNAL_STORAGE);

{$ENDIF}

接下来，我们要准备两个方法，准备做为PermissionsService.RequestPermissions方法的参数，即请求权限时的回调函数，来处理权限请求的结果及给用户的权限解释信息。

3.实现TRequestPermissionsResultEvent方法

procedure TMainForm.TakePicturePermissionRequestResult(Sender: TObject; const APermissions: TArray<string>; const AGrantResults: TArray<TPermissionStatus>);

begin

 // 申请的3个权限: CAMERA, READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE

  if (Length(AGrantResults) = ) and (AGrantResults[] = TPermissionStatus.Granted) and (AGrantResults[] = TPermissionStatus.Granted) and (AGrantResults[] = TPermissionStatus.Granted) then

  begin

    //权限被用户允许的代码

  end

  else

    //权限被用户禁止的代码

    TDialogService.ShowMessage('权限禁止，不能拍照.')

end;

4.实现TDisplayRationaleEvent方法

procedure TMainForm.DisplayRationale(Sender: TObject; const APermissions: TArray<string>; const APostRationaleProc: TProc);

var

  I: Integer;

  RationaleMsg: string;

begin

  for I :=  to High(APermissions) do

  begin

    if APermissions[I] = FPermissionCamera then

      RationaleMsg := RationaleMsg + '应用需要拍照' + SLineBreak + SLineBreak

    else if APermissions[I] = FPermissionReadExternalStorage then

      RationaleMsg := RationaleMsg + '应用需要读取照片';

  end;

  TDialogService.ShowMessage(RationaleMsg,

    procedure(const AResult: TModalResult)

    begin

      APostRationaleProc;

    end)

end;

5.用PermissionsService.RequestPermissions在app启动时申请权限

procedure TMainForm.FormCreate(Sender: TObject);

begin

{$IFDEF ANDROID}

  FPermissionCamera := JStringToString(TJManifest_permission.JavaClass.CAMERA);

  FPermissionReadExternalStorage := JStringToString(TJManifest_permission.JavaClass.READ_EXTERNAL_STORAGE);

  FPermissionWriteExternalStorage := JStringToString(TJManifest_permission.JavaClass.WRITE_EXTERNAL_STORAGE);

{$ENDIF}

  PermissionsService.RequestPermissions([FPermissionCamera, FPermissionReadExternalStorage, FPermissionWriteExternalStorage], TakePicturePermissionRequestResult, DisplayRationale);

到此，实现了动态申请app权限。具体的代码，可以到ChinaCock QQ群223717588去下载。

小年刚过，新年马上到来，在此先祝大家春节快乐，多多发财，流行的话说，1919，想啥啥有！

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