nstanceState);setContentView(R.layout.activity_main);if

{if(this.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)!

PackageManager.PERMISSION_GRANTED)

请申请权限,

Toast.LENGTH_LONG).show();//申请权限的代码//

ActivityCompat.requestPermissions(this,

new

String[]{Manifest.permission.READ_EXTERNAL_STORAGE},

REQUEST_CODE_TEST);requestPermissions(new

String[]{Manifest.permission.READ_EXTERNAL_STORAGE},

REQUEST_CODE_TEST);}}}//回调方法Overridepublic

void

{super.onRequestPermissionsResult(requestCode,

permissions,

grantResults);android.util.Log.e(test,

int

checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)

这个方法是检测是否有具有READ_EXTERNAL_STORAGE

此权限,

frameworks/base/core/java/android/content/ContextWrapper.java

Overridepublic

mBase.checkSelfPermission(permission);}

2.frameworks/base/core/java/android/content/Context.java

PackageManager.PermissionResultpublic

abstract

frameworks/base/core/java/android/app/ContextImpl.java

Overridepublic

IllegalArgumentException(permission

null);}return

ActivityManagerService.java中的方法

Overridepublic

PackageManager.PERMISSION_DENIED;}return

checkComponentPermission(permission,

pid,

checkComponentPermission(String

permission,

PackageManager.PERMISSION_GRANTED;}return

ActivityManager.checkComponentPermission(permission,

uid,owningUid,

5.接着继续调用ActivityManager.java文件中的checkComponentPermission方法

public

checkComponentPermission(String

permission,

AppGlobals.getPackageManager().checkUidPermission(permission,

uid);}

PackageManagerService.java中的checkUidPermission方法

public

checkPermissionDelegate;synchronized

(mPackages)

checkUidPermissionImpl(permName,

mCheckPermissionDelegate;}return

checkPermissionDelegate.checkUidPermission(permName,

uid,PackageManagerService.this::checkUidPermissionImpl);}private

int

getPackagesForUid(uid);PackageParser.Package

pkg

mPackages.get(packageNames[i]);}return

mPermissionManager.checkUidPermission(permName,

pkg,

PermissionManagerService.this.checkUidPermission(permName,

pkg,

UserHandle.getUserId(callingUid);final

boolean

mPackageManagerInt.getInstantAppPackageName(callingUid)

null;final

mPackageManagerInt.getInstantAppPackageName(uid)

null;final

(!mUserManagerInt.exists(userId))

{return

PackageManager.PERMISSION_DENIED;}if

(pkg

PackageManager.PERMISSION_DENIED;}}

else

(mPackageManagerInt.filterAppAccess(pkg,

callingUid,

PackageManager.PERMISSION_DENIED;}final

PermissionsState

pkg.mExtras).getPermissionsState();if

(permissionsState.hasPermission(permName,

userId))

(mSettings.isPermissionInstant(permName))

{return

PackageManager.PERMISSION_GRANTED;}}

else

PackageManager.PERMISSION_GRANTED;}}if

(isImpliedPermissionGranted(permissionsState,

permName,

PackageManager.PERMISSION_GRANTED;}}

else

PackageManager.PERMISSION_GRANTED;}if

(FULLER_PERMISSION_MAP.containsKey(permName)

perms.contains(FULLER_PERMISSION_MAP.get(permName)))

{return

PackageManager.PERMISSION_GRANTED;}}}return

PackageManager.PERMISSION_DENIED;}这里是最终判断返回值的方法,

动态申请权限不多,就是固定的几组(在上一篇文章中以介绍说明).

2.2

String[]{Manifest.permission.READ_EXTERNAL_STORAGE},

跳转到Activity.java中的requestPermissions方法

frameworks/base/core/java/android/app/Activity.java

public

IllegalArgumentException(requestCode

should

(mHasCurrentPermissionsRequest)

{Log.w(TAG,

cancellation.onRequestPermissionsResult(requestCode,

new

int[0]);return;}//创建跳转的目标activityIntent

intent

getPackageManager().buildRequestPermissionsIntent(permissions);startActivityForResult(REQUEST_PERMISSIONS_WHO_PREFIX,

intent,

null);mHasCurrentPermissionsRequest

true;}

注意一下此段代码:buildRequestPermissionsIntent(permissions)

frameworks/base/core/java/android/content/pm/PackageManager.java

NonNullUnsupportedAppUsagepublic

Intent

buildRequestPermissionsIntent(NonNull

String[]

(ArrayUtils.isEmpty(permissions))

{throw

IllegalArgumentException(permission

cannot

Intent(ACTION_REQUEST_PERMISSIONS);intent.putExtra(EXTRA_REQUEST_PERMISSIONS_NAMES,

permissions);intent.setPackage(getPermissionControllerPackageName());return

intent;}

android.content.pm.action.REQUEST_PERMISSIONS;

我们发现是GrantPermissionsActivity.java

activity

android:namecom.android.packageinstaller.permission.ui.GrantPermissionsActivityandroid:configChangeskeyboardHidden|screenSizeandroid:excludeFromRecentstrueandroid:themestyle/GrantPermissionsandroid:visibleToInstantAppstrueandroid:inheritShowWhenLockedtrueintent-filter

android:nameandroid.content.pm.action.REQUEST_PERMISSIONS

/category

android:nameandroid.intent.category.DEFAULT

shell

在Android(10)版本上,是在packages/apps/PermissionController中,单独把这块拿出来了

对话框事件处理是在GrantPermissionsViewHandlerImpl.java中,

允许,拒绝,

R.id.permission_allow_button:if

(mResultListener

{view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS,

null);mResultListener.onPermissionGrantResult(mGroupName,

R.id.permission_allow_always_button:if

(mResultListener

{view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS,

null);mResultListener.onPermissionGrantResult(mGroupName,

R.id.permission_allow_foreground_only_button:if

(mResultListener

{view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS,

null);mResultListener.onPermissionGrantResult(mGroupName,GRANTED_FOREGROUND_ONLY);}break;case

(mResultListener

{view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS,

null);mResultListener.onPermissionGrantResult(mGroupName,

DENIED);}break;case

R.id.permission_deny_and_dont_ask_again_button:if

(mResultListener

{view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS,

null);mResultListener.onPermissionGrantResult(mGroupName,DENIED_DO_NOT_ASK_AGAIN);}break;case

R.id.permission_more_info_button:Intent

intent

Intent(Intent.ACTION_MANAGE_APP_PERMISSIONS);intent.putExtra(Intent.EXTRA_PACKAGE_NAME,

mAppPackageName);intent.putExtra(Intent.EXTRA_USER,

mUserHandle);intent.putExtra(ManagePermissionsActivity.EXTRA_ALL_PERMISSIONS,

true);mActivity.startActivity(intent);break;}}

赋予应用默认运行时权限

有些用户觉得app要申请权限比较麻烦,就有定制软件默认就赋予某个应用运行时权限,不弹出对话框,我们看看怎么修改呢?

先来看frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java中的systemReady()方法

upgraded

{mDefaultPermissionPolicy.grantDefaultPermissions(userId);}

跳转到DefaultPermissionGrantPolicy.java中

public

{grantPermissionsToSysComponentsAndPrivApps(userId);//默认赋予应用的运行时权限grantDefaultSystemHandlerPermissions(userId);grantDefaultPermissionExceptions(userId);synchronized

(mLock)

{mDefaultPermissionsGrantedUsers.put(userId,

userId);}}

grantDefaultSystemHandlerPermissions(int

userId)

providergrantSystemFixedPermissionsToSystemPackage(getDefaultProviderAuthorityPackage(downloads,

userId),

UIgrantSystemFixedPermissionsToSystemPackage(getDefaultSystemHandlerActivityPackage(DownloadManager.ACTION_VIEW_DOWNLOADS,

userId),userId,

providergrantSystemFixedPermissionsToSystemPackage(getDefaultProviderAuthorityPackage(com.android.externalstorage.documents,

userId),userId,

CertInstallergrantSystemFixedPermissionsToSystemPackage(getDefaultSystemHandlerActivityPackage(Credentials.INSTALL_ACTION,

userId),

getDefaultSystemHandlerActivityPackage(Intent.ACTION_DIAL,

userId);grantDefaultPermissionsToDefaultSystemDialerApp(dialerPackage,

userId);}

{grantDefaultPermissionsToDefaultSystemDialerApp(dialerAppPackageName,

userId);}}//

{grantDefaultPermissionsToDefaultSystemSimCallManager(simCallManagerPackageName,

userId);}}//

{grantDefaultPermissionsToDefaultSystemUseOpenWifiApp(useOpenWifiPackageName,

userId);}}//

添加代码,赋予应用默认的运行时权限,不弹出申请对话框.grantPermissionsToSystemPackage(com.android.mytestapp,

userId,

如果你想添加自己的应用默认赋予运行时权限的话,可以这样子修改,如下:

添加包名

grantPermissionsToSystemPackage(com.android.mytestapp,

userId,