Android 给 app默认权限（不弹窗申请权限）

1.系统app

系统app的权限默认开启，大家应该都知道是修改。

frameworks/base/services/core/java/com/android/server/pm/

在grantDefaultSystemHandlerPermissions中可以看到

// Camera
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
 cameraPackage = getDefaultSystemHandlerActivityPackageLPr(
        cameraIntent, userId);
if (cameraPackage != null
        && doesPackageSupportRuntimePermissions(cameraPackage)) {
    grantRuntimePermissionsLPw(cameraPackage, CAMERA_PERMISSIONS, userId);
    grantRuntimePermissionsLPw(cameraPackage, MICROPHONE_PERMISSIONS, userId);
    grantRuntimePermissionsLPw(cameraPackage, STORAGE_PERMISSIONS, userId);
}

从上面这段代码就可以看到Camera中默认打开了CAMERA_PERMISSIONS, MICROPHONE_PERMISSIONS, STORAGE_PERMISSIONS这三个Dangerous Permission。

2.第三方app

手动安装的第三方app的权限默认开启是修改。

frameworks/base/services/core/java/com/android/server/pm/

在grantPermissionsLPw函数中添加如下代码

//Permissions for 
 if(("")) {
          final int permsSize = ();
          for (int i=0; i<permsSize; i++) {
              final String name = (i);
              final BasePermission bp = (name);
              if(null != bp && (bp) != PermissionsState.PERMISSION_OPERATION_FAILURE) {
                  (TAG, "zrx--- grant permission " + name + " to package " + );
                  changedInstallPermission = true;
              }
          }
      }

参考：

Android6.0 动态权限(Runtime Permission)_MyeDy的博客-****博客_android runtime 权限

Android源码 第三方应用普通安装 app权限默认开启_fmc088的博客-****博客